An angle head for numerically controlled polishing of the flow path surface of an integrally bladed disk with a catheter of curved shape

Abstract

The present invention discloses an angle head for numerically controlled polishing of the flow path surface of an integral bladed disk with a curved duct, which relates to the technical field of integral bladed disk processing, and aims to meet the current requirements of realizing efficient automatic polishing of the root flow path of the integral bladed disk, reducing the processing quality requirements of its leading processes, prolonging the working life of the tool, and reducing the cost of numerical control polishing. The invented angle head assembly includes a tool shank input shaft, a seal sleeve, an upper end cover screw, a bearing adjusting pad, an upper end cover, a rolling bearing, an angle head housing, a bearing locking nut, a lower end cover, and a lower end cover screw; the angle head angular positioning ring assembly includes a locking ring body, an angle head locking screw, an angular positioning shaft, and an angular positioning shaft locking screw; the flexible shaft assembly includes a flexible shaft, a bearing, a flexible shaft housing assembly, and a lower flexible shaft bearing; the polishing wheel assembly includes a polishing wheel and a polishing wheel axial stop block. The important feature of this angle head is that it uses a flexible shaft to rotate in a curved pipe to avoid the interference problem between the straight shank tool and the blade when polishing the root of the integral bladed disk, so as to realize wide-line polishing of the flow path surface. This technology can also be extended and applied to the milling and grinding processes, significantly improving the tool accessibility in the integral bladed disk processing process.

Description

Technical Field

[0001] The invention relates to the technical field of integral blade disc processing, in particular to an angle head for numerically controlling and polishing a flow passage surface of an integral blade disc having a curved duct. Background Art

[0002] Blisks are key components in modern aeroengines. However, due to the machining marks and residual tensile stresses introduced during the milling process, as well as the frequent occurrence of chatter and tool marks, blisks must be polished after precision milling. This process corrects machining errors introduced during the preceding process, removes tool marks from milling or grinding, eliminates surface degradation, and reduces surface roughness, ultimately improving surface fatigue strength and aerodynamic efficiency. Currently reported methods for polishing blisks primarily utilize abrasive flow polishing and robotic polishing; the use of manual polishing has not been reported. Although much research has been conducted in China on CNC polishing of blisks, very limited research has been conducted on this topic. In particular, the working conditions of the robotic polishing methods used in my country for blisks differ significantly from those used abroad. This is primarily due to the fact that milling equipment and cutting tools for blisks in my country are primarily imported and very expensive. Therefore, to reduce the manufacturing cost of blisks, increasing the tool width and using domestic cutting tools are often employed. However, these methods result in large tool marks, large tool joints, and deep removal depths. Using low-precision robotic polishing systems, it is difficult to achieve the same results as those achieved abroad. Specifically, blisks produced abroad through fine milling have a small depth of stock removal in the polishing process and are less dependent on the precision of the polishing system. However, blisks produced in my country have a large number of lines that need to be removed, and the machining errors caused by the preceding process need to be corrected. This places higher demands on blisk polishing. Of course, better polishing methods can indeed reduce the machining requirements of the preceding process. For example, increasing the tool width and shortening the tool path length can significantly reduce the manufacturing cost of blisks.

[0003] Beihang University has developed a superhard abrasive polishing wheel. Using this polishing wheel can indeed achieve the above process effects and has been successfully used for the full-profile polishing of integral blisks. However, during the polishing process, it is found that for the polishing of the flow passage part of the integral blisk, only small-diameter spherical or drum-shaped polishing tools can be used, making it difficult to significantly improve the polishing efficiency, and the service life of the polishing wheel needs to be improved. Beihang proposed a toroidal tool hobbing method for machining the blade root. Using this method can significantly improve the polishing efficiency of the flow passage surface. And if the same polishing tool can be used for both the flow passage polishing and the blade body polishing, it can reduce the joint marks caused by tool change, which is beneficial to further improving the machining quality of the integral blisk. Therefore, how to achieve wide-row and high-efficiency polishing of the blade root flow passage and reduce the machining quality requirements of the leading process to reduce the manufacturing cost, how to increase the diameter of the polishing tool to extend its service life, and how to unify the full-profile polishing tool have become important technical problems that need to be further solved in the current numerical control polishing of integral blisks.

[0004] Therefore, in view of the above problems, an angle head for numerical control polishing of the flow passage surface of an integral blisk with a curved catheter is proposed. Summary of the Invention

[0005] The purpose of the present invention is to provide an angle head for numerical control polishing of the flow passage surface of an integral blisk with a curved catheter, so as to solve the problems in the existing technology mentioned in the above background technology, namely, how to achieve wide-row and high-efficiency polishing of the blade root flow passage and reduce the machining quality requirements of the leading process to reduce the manufacturing cost, how to increase the diameter of the polishing tool to extend its service life, and how to unify the full-profile polishing tool, which are the problems in the current numerical control polishing of integral blisks.

[0006] To achieve the above purpose, the present invention provides the following technical solution: An angle head for numerical control polishing of the flow passage surface of an integral blisk with a curved catheter, comprising an angle head assembly, an angle head angular positioning ring assembly, a flexible shaft assembly, and a polishing wheel assembly.

[0007] Angle head assembly: It includes a tool shank input shaft, a seal sleeve, an upper end cover screw, a bearing adjustment pad, an upper end cover, a rolling bearing, an angle head housing, a bearing locking nut, a lower end cover, and a lower end cover screw;

[0008] Angle head angular positioning ring assembly: It includes a locking ring body, an angle head locking screw, an angular positioning shaft, and an angular positioning shaft locking screw;

[0009] Flexible shaft assembly: It includes a flexible shaft, a bearing, a flexible shaft catheter housing assembly, and a flexible shaft lower bearing;

[0010] Polishing wheel assembly: It includes a polishing wheel and a polishing wheel axial stop block.

[0011] By adopting the above technical solution, the angle head assembly is mainly used to transmit the power and rotary motion from the main shaft rotor, and is connected to the flexible shaft assembly through a notch to transmit the power to the flexible shaft assembly.

[0012] Further, the flexible shaft assembly is located below the angle head assembly, the polishing wheel assembly is located at the end of the flexible shaft assembly, and the angle head angular positioning ring assembly is located in the middle of the angle head assembly.

[0013] By adopting the above technical solution, as Figure 1 shown, an angle head for numerically controlled polishing of the integral bladed disk flow path surface in a complete curved shape is composed of an angle head assembly, an angle head angular positioning ring assembly, a flexible shaft assembly and a polishing wheel assembly.

[0014] Further, a notch is provided at the lower end of the tool shank input shaft for connecting a sealing sleeve, the sealing sleeve is connected to the upper end cover, and upper end cover screws are provided inside the upper end cover and are used to connect the angle head housing.

[0015] By adopting the above technical solution, the provided sealing sleeve can prevent external dust from entering the bearing interior.

[0016] Further, the rolling bearing is arranged inside the tool shank input shaft and is embedded in the notch on the inner side of the angle head housing. The bearing adjusting pad is located at the gap between the rolling bearing and the upper end cover for adjustment. The rolling bearing is fixed by a bearing locking nut. The lower end cover is arranged at the lower end of the angle head assembly and is fixed by lower end cover screws.

[0017] By the above technical solution, the lower end cover screws firmly fix the angle head housing.

[0018] Further, the angle head angular positioning ring assembly is located outside the angle head assembly for angular positioning. The angular positioning shaft is movably connected to the locking ring body. Openings for adjusting the tightness of the installation of the angular positioning shaft and the angle head assembly are provided on both sides of the locking ring body. An angle head locking screw is provided on one side of the locking ring body, and an angular positioning shaft locking screw is provided on the other side of the locking ring body.

[0019] By adopting the above technical solution, the angular positioning shaft and the angle head assembly can be limited based on the angle head angular positioning ring assembly.

[0020] Further, the flexible shaft includes a flexible shaft input key, a flexible shaft wire rope and a flexible shaft output joint. The flexible shaft output joint is welded to the flexible shaft wire rope. A threaded structure is provided at the lower end of the flexible shaft output joint for connecting the polishing wheel assembly. A precise cylindrical surface and an upper end surface are ground on the upper end of the flexible shaft output joint for forming a sliding shaft bearing structure with a sliding bearing. The flexible shaft input key is welded to the flexible shaft wire rope.

[0021] By adopting the above technical solutions, the flexible shaft output joint can be welded to the wire rope or press riveted. Subsequently, the accurate outer shape is obtained through processing. The threaded structure provided at the lower end is used to connect the polishing wheel assembly. The precisely ground cylindrical surface and upper end surface at the upper end are used to contact the sliding bearing, thereby forming a sliding shaft bearing structure. When space permits, it can also be used as the mounting surface for installing a rolling bearing. The flexible shaft input key at the upper end is finally connected to the wire rope by press riveting or welding during the assembly of the component. After connection, the geometric dimensions of the key need to be ensured to meet the requirements through processing.

[0022] Further, the bearing is the upper bearing of the flexible shaft, which is used to prevent the axial movement of the flexible shaft. The flexible shaft housing assembly includes a bearing seat and a flexible shaft outer housing, and the flexible shaft lower bearing is the lower bearing of the flexible shaft.

[0023] By adopting the above technical solutions, the bearing is the upper bearing of the flexible shaft assembly, which is mainly used to prevent the axial movement of the flexible shaft. When necessary, a spring can be added at the lower end of the bearing. The flexible shaft housing assembly includes a bearing seat and a flexible shaft outer housing, which is made by bending a steel pipe. The accurate bearing mounting surface combination dimensions and accuracy can be obtained through processing at the lower end. The flexible shaft lower bearing adopts a sliding bearing structure when the space dimension is too small and a rolling bearing structure when the space dimension is large.

[0024] Further, the polishing wheel includes a polishing wheel core, a polishing wheel rubber matrix, and a polishing wheel abrasive belt. There are multiple polishing wheels, and the multiple polishing wheels are respectively located below the axial stop blocks of the polishing wheel.

[0025] By adopting the above technical solutions, it is used to provide a certain axial support force for end polishing of the polishing wheel, improve the axial stiffness of the edge of the polishing wheel, and its material can be a non-metallic material or a conventional resin polishing wheel, and it can contain abrasives inside.

[0026] Further, a long-life cubic boron nitride is attached to the polishing wheel abrasive belt by electroplating.

[0027] By adopting the above technical solutions, the polishing wheel abrasive belt can be attached with long-life CBN or synthetic diamond abrasives by electroplating or other methods.

[0028] Compared with the prior art, the beneficial effects of the present invention are:

[0029] 1. For the angle head for numerically controlled polishing of the integral blisk flow path surface with a curved shape, there is currently no precedent in the world for using a polishing tool with a curved tool shank to process complex curved surface structures such as blisks. Compared with the straight tool shank system, the use of the curved tool shank structure can effectively avoid the interference problem during the polishing process of the integral blisk and can break through the problem of poor accessibility of the numerically controlled machining tool for curved surfaces in narrow spaces;

[0030] 2. The angle head for CNC polishing of the integral blisk flow path surface with a curved shape can achieve end polishing or circumferential polishing of the integral blisk flow path surface, which can greatly increase the contact width compared with the previous solutions using spherical or drum-shaped polishing wheels, and the polishing wheel has a larger diameter and longer service life. Therefore, it can improve the polishing efficiency of the integral blisk flow path surface and reduce the polishing cost.

[0031] 3. The angle head for CNC polishing of the integral blisk flow path surface with a curved conduit can polish all surfaces of the integral blisk blades by simultaneously using the end face and side face of a polishing tool.

[0032] 4. The angle head for CNC polishing of the integral blisk flow path surface with a curved conduit can machine the flow path and blade body on the integral blisk from one side of the integral blisk during a single installation of the integral blisk, which can reduce the tool mark at the tool joint. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] Figure 1 is the main sectional view schematic diagram of the angle head of the present invention;

[0034] Figure 2 is the left sectional view schematic diagram of the angle head of the present invention;

[0035] Figure 3 is the partial enlarged view schematic diagram of the lower end of the flexible shaft assembly and the polishing wheel assembly of the present invention;

[0036] Figure 4 is the sectional view schematic diagram of the angle head assembly of the present invention;

[0037] Figure 5 is the schematic diagram of the angular positioning ring assembly of the angle head of the present invention;

[0038] Figure 6 is the schematic diagram of the flexible shaft assembly of the angle head of the present invention;

[0039] Figure 7 is the sectional view of the polishing wheel assembly D of the present invention.

[0040] In the figure: 1. Angle head assembly; 101. Tool shank input shaft; 102. Sealing sleeve; 103. Upper end cover screw; 104. Bearing adjusting pad; 105. Upper end cover; 106. Rolling bearing; 107. Angle head housing; 108. Bearing locking nut; 109. Lower end cover; 110. Lower end cover screw; 2. Angle head angular positioning ring assembly; 201. Locking ring body; 202. Angle head locking screw; 203. Angular positioning shaft; 204. Angular positioning shaft locking screw; 3. Flexible shaft assembly; 301. Flexible shaft; 30101. Flexible shaft input key; 30102. Flexible shaft wire rope; 30103. Flexible shaft output joint; 302. Bearing; 303. Flexible shaft housing assembly; 30301. Bearing seat; 30302. Flexible shaft outer housing; 304. Lower flexible shaft bearing; 4. Polishing wheel assembly; 401. Polishing wheel; 40101. Polishing wheel core; 40102. Polishing wheel rubber matrix; 40103. Polishing wheel abrasive belt; 402. Polishing wheel axial stop block. Detailed implementation manners

[0041] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. The described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0042] As Figure 1 、 2 As shown in FIGS. 1, 2 and 4, the angle head assembly 1 includes a tool shank input shaft 101, a sealing sleeve 102, an upper end cover screw 103, a bearing adjusting pad 104, an upper end cover 105, a rolling bearing 106, an angle head housing 107, a bearing locking nut 108, a lower end cover 109 and a lower end cover screw 110. The body is composed of an angle head assembly 1, an angle head angular positioning ring assembly 2, a flexible shaft assembly 3 and a polishing wheel assembly 4. The flexible shaft assembly 3 is located below the angle head assembly 1, the polishing wheel assembly 4 is located at the tail end of the flexible shaft assembly 3, the angle head angular positioning ring assembly 2 is located in the middle of the angle head assembly 1. The rolling bearing 106 is arranged in the tool shank input shaft 101 and is embedded in the notch on the inner side of the angle head housing 107. The bearing adjusting pad 104 is located in the gap between the rolling bearing 106 and the upper end cover 105 for adjustment. The rolling bearing 106 is fixed by the bearing locking nut 108. The lower end cover 109 is arranged at the lower end of the angle head assembly 1 and is fixed by the lower end cover screw 110. Compared with the original straight shank tool system, the use of the bent tool shank structure can effectively avoid the interference problem in the overall blisk polishing process and can break through the problem of poor accessibility of the CNC machining tool for narrow space curved surfaces.

[0043] As Figure 5As shown in the figure, the angular head angular positioning ring assembly 2 includes a locking ring body 201, an angular head locking screw 202, an angular positioning shaft 203, and an angular positioning shaft locking screw 204. The angular head angular positioning ring assembly 2 is located outside the angular head assembly 1 and is used for angular positioning. The angular positioning shaft 203 is movably connected to the locking ring body 201. Both sides of the locking ring body 201 are provided with openings for adjusting the tightness of the installation of the angular positioning shaft 203 and the angular head assembly 1. One side of the locking ring body 201 is provided with an angular head locking screw 202, and the other side of the locking ring body 201 is provided with an angular positioning shaft locking screw 204. The angular head angular positioning ring assembly 2 plays a role in limiting and fixing the angular head assembly 1 and the angular positioning shaft 203.

[0044] As Figure 6 shown in the figure, the flexible shaft assembly 3 includes a flexible shaft 301, a bearing 302, a flexible shaft housing assembly 303, and a flexible shaft lower bearing 304. The flexible shaft 301 includes a flexible shaft input key 30101, a flexible shaft wire rope 30102, and a flexible shaft output joint 30103. The flexible shaft output joint 30103 is welded to the flexible shaft wire rope 30102. The lower end of the flexible shaft output joint 30103 is provided with a threaded structure for connecting to the polishing wheel assembly 4. The upper end of the flexible shaft output joint 30103 is ground to form an accurate cylindrical surface and an upper end surface for connecting with a sliding bearing to form a sliding shaft bearing structure. The flexible shaft input key 30101 is welded to the flexible shaft wire rope 30102. The bearing 302 is the upper bearing of the flexible shaft 301 and is used to prevent the axial movement of the flexible shaft 301. The flexible shaft housing assembly 303 includes a bearing seat 30301 and a flexible shaft outer housing 30302. The flexible shaft lower bearing 304 is the lower bearing of the flexible shaft 301. Among them, the flexible shaft output joint 30103 can be welded to the wire rope 30102 or press riveted, and then the accurate outer shape is obtained by processing. The threaded structure provided at its lower end is used to connect to the polishing wheel assembly 4, and the accurate cylindrical surface and upper end surface ground at its upper end are used to contact with the sliding bearing, thereby forming a sliding shaft bearing structure. When the space permits, it can also be used as the mounting surface for installing the rolling bearing 106. The flexible shaft input key 30101 at its upper end is finally connected to the wire rope 30102 by press riveting or welding in the assembly of this component. After connection, it is also necessary to ensure that the geometric dimensions of the key meet the requirements through processing. The bearing 302 is the upper bearing of the flexible shaft assembly 3 and is mainly used to prevent the axial movement of the flexible shaft. When necessary, a spring can be added at the lower end of the bearing 302. The flexible shaft housing assembly 303 includes a bearing seat 30301 and a flexible shaft outer housing 30302, which is made by bending a steel pipe. The lower end can obtain accurate bearing mounting surface combination dimensions and accuracy through processing. The flexible shaft lower bearing 304 adopts a sliding bearing structure when the space size is too small, and adopts a rolling bearing 106 structure when the space size is large.

[0045] As Figure 7As shown, the polishing wheel assembly 4 includes a polishing wheel 401 and a polishing wheel axial stop 402. The polishing wheel 401 is composed of a polishing wheel core 40101, a polishing wheel rubber matrix 40102, and a polishing wheel abrasive belt 40103. There are multiple polishing wheels 401, and the multiple polishing wheels 401 are respectively located below the polishing wheel axial stop 402. Cubic boron nitride with long service life is attached to the polishing wheel abrasive belt 40103 by electroplating. It provides a certain axial support force for the end polishing of the polishing wheel 401, improves the axial stiffness of the edge of the polishing wheel 401. Its material can be non-metallic material or a conventional resin polishing wheel 401, and it can contain abrasives inside, realizing the end polishing or circumferential polishing of the overall blisk flow path surface. Compared with the previous solution of the spherical or drum-shaped polishing wheel assembly 4, the contact width can be greatly increased, and the diameter of the polishing wheel 401 is larger and the service life is longer. Therefore, the polishing efficiency of the overall blisk flow path surface can be improved and the polishing cost can be reduced.

[0046] Working principle: When in use, the angle head assembly 1 can be installed at the end of the spindle of a conventional machine tool like other conventional machine tool angle heads to achieve five-axis linkage polishing, or it can be installed at the lower end of a turntable concentric with the spindle. The structure of the turntable includes but is not limited to: installing a large gear that can rotate independently and coaxially with the spindle at the lower end of the spindle. This gear is connected to the gear or pulley on the servo motor installed on the spindle box through a gear or toothed belt, so that the servo motor drives the large gear to rotate, thereby driving the angle head housing to rotate. The latter is mainly used to achieve linkage polishing of more than 6 axes. The angle head housing 107 can rotate together with the turntable installed at the end of the spindle, or it can be installed on a conventional spindle housing without this turntable and remain relatively stationary with respect to the spindle housing. The angle head input shaft 101 transmits the power of the spindle through the notch or keyway at its lower end to the flexible shaft assembly 301, and drives the polishing wheel assembly 4 installed at the lower end of the flexible shaft 301 to rotate through the flexible shaft 301 passing through the flexible shaft housing assembly 303. Its characteristic is that the flexible shaft outer housing 30302 is made of steel pipe, and its diameter is very small and can pass through the curved flow path space of the overall blisk, realizing the end polishing of the root flow path surface. Since the end polishing contact surface area is large, higher efficiency polishing can be achieved. At the same time, this polishing method can simultaneously polish the blade body area, root transition fillet, etc. of the overall blisk using the drum-shaped structure on the side of the polishing wheel 401, so as to achieve the purpose of machining all curved surface areas of the overall blisk with a unified tool.

[0047] It is obvious to those skilled in the art that the present invention is not limited to the details of the above-described exemplary embodiments, and that the present invention can be implemented in other specific forms without departing from the spirit or essential characteristics of the present invention. Therefore, from any point of view, the embodiments should be regarded as exemplary and non-limiting. The scope of the present invention is defined by the appended claims rather than the above description. Therefore, all changes falling within the meaning and scope of the equivalent elements of the claims are intended to be embraced within the present invention. Any reference signs in the claims should not be construed as limiting the claims involved.

Claims

1. An angle head for CNC polishing of the flow path surface of an integral blisk with a curved catheter, comprising a body including an angle head assembly (1), an angle head angular positioning ring assembly (2), a flexible shaft assembly (3) and a polishing wheel assembly (4), characterized in that: The angle head assembly (1) includes a tool shank input shaft (101), a seal sleeve (102), an upper end cover screw (103), a bearing adjusting pad (104), an upper end cover (105), a rolling bearing (106), an angle head housing (107), a bearing locking nut (108), a lower end cover (109) and a lower end cover screw (110); The angle head angular positioning ring assembly (2) includes a locking ring body (201), an angle head locking screw (202), an angular positioning shaft (203) and an angular positioning shaft locking screw (204); The flexible shaft assembly (3) includes a flexible shaft (301), a bearing (302), a flexible shaft catheter housing assembly (303) and a flexible shaft lower bearing (304); The polishing wheel assembly (4) includes a polishing wheel (401) and a polishing wheel axial stop (402); The angle head angular positioning ring assembly (2) is located outside the angle head assembly (1) for angular positioning. The angular positioning shaft (203) is movably connected to the locking ring body (201). Both sides of the locking ring body (201) are provided with openings for adjusting the installation tightness of the angular positioning shaft (203) and the angle head assembly (1). One side of the locking ring body (201) is provided with an angle head locking screw (202), and the other side of the locking ring body (201) is provided with an angular positioning shaft locking screw (204); The flexible shaft (301) includes a flexible shaft input key (30101), a flexible shaft steel wire rope (30102) and a flexible shaft output joint (30103). The flexible shaft output joint (30103) is welded to the flexible shaft steel wire rope (30102). The lower end of the flexible shaft output joint (30103) is provided with a threaded structure for connecting the polishing wheel assembly (4). The upper end of the flexible shaft output joint (30103) is ground to form an accurate cylindrical surface and an upper end surface for connecting with a sliding bearing to form a sliding shaft bearing structure. The flexible shaft input key (30101) is welded to the flexible shaft steel wire rope (30102).

2. The angle head for numerically controlled polishing of the flow passage surface of the blisk with a catheter having a curved shape according to claim 1, characterized in that: The flexible shaft assembly (3) is located below the angle head assembly (1), the polishing wheel assembly (4) is located at the tail end of the flexible shaft assembly (3), and the angle head angular positioning ring assembly (2) is located in the middle of the angle head assembly (1).

3. The angle head for numerically controlled polishing of the flow path surface of an integral bladed disk with a curved duct according to claim 1, characterized in that: The lower end of the tool shank input shaft (101) is provided with a notch for connecting the seal sleeve (102). The seal sleeve (102) is connected to the upper end cover (105). The upper end cover (105) is provided with an upper end cover screw (103) and is used for connecting the angle head housing (107).

4. The angle head for numerically controlled polishing of the flow path surface of an integral bladed disk with a curved duct according to claim 3, characterized in that: The rolling bearing (106) is provided in the tool shank input shaft (101) and is embedded in the notch on the inner side of the angle head housing (107). The bearing adjusting pad (104) is located in the gap between the rolling bearing (106) and the upper end cover (105) for adjustment. The rolling bearing (106) is fixed by a bearing locking nut (108). The lower end cover (109) is provided at the lower end of the angle head assembly (1) and is fixed by lower end cover screws (110).

5. The angle head for numerically controlled polishing of the flow passage surface of an integrally bladed disk with a curved duct according to claim 1, characterized in that: The bearing (302) is the upper bearing of the flexible shaft (301) and is used to prevent axial movement of the flexible shaft (301). The flexible shaft conduit housing assembly (303) includes a bearing seat (30301) and a flexible shaft outer housing (30302). The lower flexible shaft bearing (304) is the lower bearing of the flexible shaft (301).

6. The angle head for numerically controlled polishing of the flow passage surface of the blisk with a curved duct according to claim 1, characterized in that: The polishing wheel (401) consists of a polishing wheel core (40101), a polishing wheel rubber matrix (40102), and a polishing wheel abrasive belt (40103). A plurality of polishing wheels (401) are provided, and the plurality of polishing wheels (401) are respectively located below the polishing wheel axial stop (402).

7. The angle head for numerically controlled polishing of the flow passage surface of the blisk with a curved duct according to claim 6, characterized in that: The long - life cubic boron nitride is attached to the polishing wheel abrasive belt (40103) by electroplating.

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