Clamp for machining axial end face of turbine rotor shaft

Abstract

The application discloses a kind of clamps of turbine rotor shaft axial end face machining, interval sleeve is located in the side of support plate and is fixed with support plate, sliding mechanism is located in the other side of support plate, sliding mechanism, clamping mechanism are two and are oppositely arranged, sliding mechanism is respectively connected with drive mechanism and clamping mechanism, first connecting rod is fixed with sliding mechanism, first spring and push block are all sleeved on first connecting rod, one end of first spring is abutted with sliding mechanism, the other end of first spring is abutted with push block, push block is abutted with clamping block, clamping block is hinged with first connecting rod, clamping block is hinged with sliding mechanism, cam surface is equipped on clamping block, when drive mechanism works and makes the cam surface on clamping block clamping rotor shaft, clamping block occurs rotary motion after clamping rotor shaft, when cam surface produces axial drag force to rotor shaft when clamping block rotates and moves, the axial end of waste gas impeller is kept against interval sleeve.This application has the characteristics of improving clamping reliability.

Description

Technical Field

[0001] This invention relates to the field of turbine machining, and more specifically to a fixture for machining the axial end face of a turbine rotor shaft. Background Technology

[0002] With the increasing demand for vehicle modification from domestic and international car customers, the turbine rotor is the most important component of the turbocharger. The operating temperature of the turbine rotor can reach 800-900℃, and defects in its production and processing will greatly affect the quality of the entire turbocharger.

[0003] like Figure 1 As shown, a turbine rotor typically consists of an exhaust gas impeller A and a rotor shaft B. The exhaust gas impeller A rotates under the impact of exhaust gas energy, while the rotor shaft B transmits torque and supports the rotating components. The shaft end A1 of the exhaust gas impeller A is usually welded to one end of the rotor shaft B. After welding, due to factors such as post-weld stress, the axial direction of the rotor shaft B becomes non-perpendicular to the axial end face of the exhaust gas impeller A. This results in the other end of the rotor shaft B not being parallel to the axial end face of the exhaust gas impeller A. Since the exhaust gas impeller A is a precision-cast part, its axial end face usually does not require machining. Therefore, the axial end face C of the other end of the rotor shaft B must first be machined to make it parallel to the axial end face of the exhaust gas impeller A. Subsequently, other methods are used to machine the circumferential surface of the rotor shaft B to ensure that the axial end face of the rotor shaft B is perpendicular to the axial end face of the exhaust gas impeller A.

[0004] Before machining the rotor shaft B, it is necessary to clamp the rotor shaft B. The existing clamping method is as follows: a spacer sleeve is used to support the shaft head A1 on the exhaust gas impeller A. In addition, two sets of clamping components are used. Each set of clamping components consists of a cylinder and a V-block. The power output end of the cylinder is fixed to the V-block. The cylinder drives the V-block to feed towards the rotor shaft A. The two V-blocks clamp the rotor shaft A.

[0005] In the above clamping method, the force-bearing surface is on the V-block. Even if the axial end face of the exhaust gas impeller A abuts against the end face of the spacer sleeve during clamping, the rotor shaft B will be forcibly subjected to force because the force-bearing surface is on the plane of the V-block. This will cause the axial end face of the exhaust gas impeller A to shift instantaneously relative to the end face of the spacer sleeve, resulting in tilting. This will affect the inconsistent dimensions between the end face of the exhaust gas impeller and the end of the rotor shaft, ultimately affecting subsequent processing. Summary of the Invention

[0006] This invention provides a fixture for machining the axial end face of a turbine rotor shaft to improve clamping reliability.

[0007] The technical solutions to the above problems are as follows: A fixture for machining the axial end face of a turbine rotor shaft includes a support plate, a spacer sleeve, a sliding mechanism, a drive mechanism for driving the sliding mechanism to move linearly, and a clamping mechanism. The spacer sleeve is located on one side of the support plate and is fixed to the support plate. The sliding mechanism is located on the other side of the support plate. There are two sliding mechanisms and two clamping mechanisms arranged opposite to each other. The sliding mechanism is connected to the drive mechanism and the clamping mechanism respectively. The clamping mechanism includes a first connecting rod, a first spring, a push block, and a clamping block. The first connecting rod is fixed to the sliding mechanism. The first spring and the push block are both sleeved on the first connecting rod. One end of the first spring abuts against the sliding mechanism, and the other end of the first spring abuts against the push block. The push block abuts against the clamping block. The clamping block is hinged to the first connecting rod and the clamping block is hinged to the sliding mechanism. The clamping block is provided with a cam surface. When the drive mechanism works, the cam surface on the clamping block clamps the rotor shaft, and the clamping block rotates. When the clamping block rotates, the cam surface generates an axial drag force on the rotor shaft, keeping the axial end of the exhaust gas impeller against the spacer sleeve.

[0008] When the drive mechanism is activated, it drives the two sliding mechanisms to move linearly. The clamping mechanism connected to the sliding mechanisms moves linearly along with the sliding mechanisms. When the cam surfaces on the two clamping blocks engage with the rotor shaft, the two cam surfaces first clamp the rotor shaft. As the drive mechanism continues to output power and causes the sliding mechanisms to continue moving linearly, the clamping blocks cannot continue to move linearly like the sliding mechanisms. Therefore, the clamping blocks are forced to rotate. Since the cam surfaces are curved, they provide space for the movement of the clamping blocks. On the other hand, during the rotation, the cam surfaces generate an axial drag force on the rotor shaft, causing the entire turbine rotor to move axially along the spacer sleeve. This causes the axial end face of the exhaust gas impeller to abut against the axial end face of the spacer sleeve, thereby preventing the exhaust gas impeller from tilting relative to the spacer sleeve during clamping. As such, this invention improves the clamping accuracy, thus providing a guarantee for the subsequent machining of the axial end face of the rotor shaft. Attached Figure Description

[0009] Figure 1 This is a structural diagram of the turbine rotor.

[0010] Figure 2 A perspective view of the fixture used for machining the axial end face of the turbine rotor shaft.

[0011] Figure 3 A perspective view of a fixture for machining the axial end face of a turbine rotor shaft in another direction, with part of the parts hidden.

[0012] Figure 4 In order to be in Figure 3 This is a diagram showing the parts that have been partially hidden.

[0013] Figure 5 First sectional view of the fixture for machining the axial end face of the turbine rotor shaft.

[0014] Figure 6 The second sectional view of the fixture for machining the axial end face of the turbine rotor shaft.

[0015] Figure 7 This is a 3D view of the clamping block.

[0016] Figure 8 This is a three-dimensional diagram of the base.

[0017] Figure 9 This is a three-dimensional view of the support.

[0018] The markings in the attached diagram are: exhaust gas impeller A, rotor shaft B, and axial end face C.

[0019] The markings in the attached diagram are: support plate 1, spacer sleeve 2, first connecting rod 3, first spring 4, push block 5, clamping block 6, cam surface 6a, groove 6b, hinge shaft 6c, seat 7, first groove 7a, first stepped hole 7b, first mounting hole 7c, second mounting hole 7d, first assembly groove 7e, second assembly groove 7f, linear guide assembly 8, second connecting rod 9, support 10, first hole 10a, second hole 10b, third hole 10c, stepped hole 10d, first support block. 10e, second support block 10f, notch 10g, second notch 10h, first rack 11, first gear 12, second rack 13, bracket 14, linear drive component 15, third link 16, pad 17, needle roller 18, slide plate 19, fourth link 20, plug 21, second spring 22, shoulder 22a, guide rod 23, third spring 24, base plate 25, machine tool worktable 26, guide groove 27, screw support 28, screw 29, handwheel 30. Detailed Implementation

[0020] like Figures 1 to 9 As shown, the fixture for machining the axial end face of the turbine rotor shaft of the present invention includes a support plate 1, a spacer sleeve 2, a sliding mechanism, a drive mechanism for driving the sliding mechanism to move linearly, and a clamping mechanism. The following describes each part and the relationship between them in detail.

[0021] A portion of the sliding mechanism and drive mechanism is fixed to a base plate 25, which mates with a machine tool table 26. The base plate 25 has a guide groove 27 and a threaded hole. The machine tool table 26 has a guide rail (not shown) and a screw support 28. The guide rail slides into the guide groove 27. A screw 29 is movably connected to the screw support 28 and threadedly connected to the threaded hole on the base plate 25. The screw 29 is also connected to a handwheel 30. Since the screw 29, base plate 25, guide rail, and guide groove 27 form a lead screw mechanism, when the handwheel 30 is rotated, it drives the screw 29 to rotate, causing the base plate 25 to move linearly relative to the machine tool table 26, displacing the entire fixture to the desired position, such as the position for cutting the axial end face C of the rotor shaft B.

[0022] The spacer sleeve 2 is located on one side of the support plate 1 and is fixed to the support plate 1. The sliding mechanism is located on the other side of the support plate 1. There are two sliding mechanisms and two clamping mechanisms, which are arranged opposite to each other. The sliding mechanism is connected to the driving mechanism and the clamping mechanism respectively. The clamping mechanism includes a first connecting rod 3, a first spring 4, a push block 5, and a clamping block 6. The first connecting rod 3 is fixed to the sliding mechanism. The first spring 4 and the push block 5 are both sleeved on the first connecting rod 3. One end of the first spring 4 abuts against the sliding mechanism, and the other end of the first spring 4 abuts against the push block 5. The push block 5 abuts against the clamping block 6. The clamping block 6 is hinged to the first connecting rod 3 and hinged to the sliding mechanism. The clamping block 6 is provided with a cam surface 6a. When the driving mechanism works, the cam surface 6a on the clamping block 6 clamps the rotor shaft B, and the clamping block 6 rotates. When the clamping block 6 rotates, the cam surface 6a generates an axial drag force on the rotor shaft B, so that the axial end of the exhaust gas impeller A is kept against the spacer sleeve 2.

[0023] When the drive mechanism is activated, it drives the two sliding mechanisms to move linearly. The clamping mechanism connected to the sliding mechanisms moves linearly along with the sliding mechanisms. When the cam surfaces 6a on the two clamping blocks 6 engage with the rotor shaft B, the two cam surfaces 6a first clamp the rotor shaft B. As the drive mechanism continues to output power and causes the sliding mechanisms to continue moving linearly, the clamping blocks 6 cannot continue to move linearly like the sliding mechanisms. Therefore, the clamping blocks 6 are forced to rotate. Since the cam surfaces 6a are curved, they provide space for the movement of the clamping blocks 6. In the rotation process, the cam surfaces 6a generate an axial drag force on the rotor shaft B, causing the entire turbine rotor to move axially along the spacer sleeve 2. This causes the axial end face of the exhaust impeller A to abut against the axial end face of the spacer sleeve 2, thereby preventing the exhaust impeller A from tilting relative to the spacer sleeve 2 during clamping. Thus, the present invention improves the clamping accuracy, thereby providing a guarantee for the subsequent machining of the axial end face C of the rotor shaft B.

[0024] The clamping block 6 has a groove 6b, the surface of which is the cam surface 6a. The cam surface 6a has a friction-enhancing component. The friction-enhancing component preferably has a knurled structure, which can be a mesh-like knurling. Since the clamping block 6 generates an axial drag force on the rotor shaft B through the cam surface 6a during rotation, the friction-enhancing component on the cam surface 6a increases the clamping force between the cam surface 6a and the rotor shaft B, thereby preventing slippage during the drag force generated by the cam surface 6a on the rotor shaft B.

[0025] The sliding mechanism includes a base 7, a linear guide assembly 8, and a second connecting rod 9. The base 7 is fixed to the linear guide assembly 8, which consists of a linear guide rail and a slider. The linear guide rail is fixed to the base plate 25, and the slider slides in cooperation with the linear guide rail. The base 7 is fixed to the slider. The base 7 has a first groove 7a located in the middle of the base 7. The first connecting rod 3, the first spring 4, the push block 5, and the clamping block 6 are all located in the first groove 7a. A hinge shaft 6c is installed on the clamping block 6. The base 7 has a first mounting hole 7c. The hinge shaft 6c cooperates with the first mounting hole 7c, so that the clamping block 6 and the base 7 form a hinge. After arranging the first connecting rod 3, the first spring 4, the push block 5, and the clamping block 6 in the first groove 7a, this structure places the clamping mechanism within the space already occupied by the base 7, avoiding the clamping mechanism being exposed outside the base 7 and occupying space in other parts. Therefore, it is not only compact in structure but also helps to reduce the size of the clamp.

[0026] The second connecting rod 9 is located within the first groove 7a. The base 7 has a second mounting hole 7d, which engages with the second mounting hole 7d to fix the second connecting rod 9 to the base 7. The second connecting rod 9 has a first threaded hole, and the first connecting rod 3 has a thread. The first connecting rod 3 is threadedly connected to the first threaded hole on the second connecting rod 9. Because the first connecting rod 3 and the second connecting rod 9 are threadedly connected, this structure allows adjustment of the position of the first connecting rod 3, thereby adjusting the initial position of the two clamping blocks 6. This adjusts the initial interval between the two clamping blocks 6, making the clamp suitable for clamping different rotor shafts B. In this embodiment, the diameter range of the clamped rotor shaft B is 8 to 40 mm.

[0027] The drive mechanism includes a support base, a transmission assembly, and a linear actuator. The linear actuator is fixed to the support base. There are two sets of transmission assemblies, each fixed to the linear actuator and movably connected to the support base. Each set of transmission assemblies is also fixed to a sliding mechanism. In this embodiment, one linear actuator simultaneously drives both sets of transmission assemblies, which not only simplifies the fixture structure and reduces its volume, but also helps reduce costs by saving one linear actuator.

[0028] The support base includes two supports 10, each of which has a first hole 10a, a second hole 10b, and a third hole 10c for movably connecting with the transmission assembly. The first hole 10a is arranged along the vertical direction of the support 10, the second hole 10b is arranged along the front-back direction of the support 10, and the third hole 10c is arranged along the left-right direction of the support 10. In addition, the support 10 is composed of a first support block 10e and a second support block 10f. After the first support block 10e and the second support block 10f are fixed, the entire support 10 is generally L-shaped, thereby forming a gap 10g between the first support block 10e and the second support block 10f. The sliding mechanism is located in the gap 10g. This structure arranges the sliding mechanism in the space already occupied by the support 10, which not only simplifies the fixture structure but also reduces the size of the fixture, making it easier and more convenient to assemble the fixture on the machine tool.

[0029] The transmission assembly includes a first rack 11, a first gear 12, and a second rack 13. The first rack 11 is fixed to the linear actuator and is slidably engaged with the first hole 10a. The first gear 12 is engaged with the second hole 10b. Bearings are installed at both ends of the first gear 12, and the bearings are interference-fitted with the second hole 10b, so that the first gear 12 can rotate relative to the support 10 after being subjected to torque. The first gear 12 meshes with the first rack 11. The second rack 13 is slidably engaged with the third hole 10c and meshes with the first gear 12. In this embodiment, a first mounting groove 7e is provided on the seat 7 in the sliding mechanism. A part of the second rack 13 is located in the first mounting groove 7e. The second rack 13 is tightly connected to the seat 7 by screws, thereby fixing the second rack 13 to the sliding mechanism.

[0030] The linear actuator includes a bracket 14, a linear drive component 15, and a third link 16. The lower end of the bracket 14 is fixed to a support base, and the upper end of the bracket 14 is fixed to the linear drive component 15. The third link 16 is fixed to the power output end of the linear drive component 15, and both ends of the third link 16 are fixed to two sets of transmission components, respectively. The linear drive component 15 can be a cylinder, a hydraulic cylinder, an electric lead screw mechanism, etc.

[0031] When the linear actuator drives the first rack 11 to descend along the support 10, the two first racks 11 respectively drive a first gear 12 to rotate. The two first gears 12 drive the two second racks 13 to move towards each other, thereby causing the two seats 7 to move towards each other. Consequently, the clamping mechanisms on the two seats 7 move towards each other. As the clamping mechanisms continue to move towards each other, the cam surface 6a on the clamping block 6 first clamps the rotor shaft B. When the clamping block 6 rotates, the cam surface 6a generates an axial drag force on the rotor shaft B.

[0032] In addition to the structure described above, the drive mechanism can also employ two linear drive components, with one linear drive component arranged on the outer side of each support 10, and each linear drive component directly connected to one support 10. This eliminates the need for a transmission assembly.

[0033] The fixture in this embodiment also includes a sliding assembly that applies pressure to the sliding mechanism to improve the operational stability of the sliding mechanism. The sliding assembly includes a first part and a second part. The first part is fixed to the sliding mechanism, and the second part is fixed to the drive mechanism. The first part and the second part slide together.

[0034] The first part includes a pad 17 and a needle roller 18. A second mounting groove 7f is provided on the seat 7, and the pad 17 mates with the second mounting groove 7f. The pad 17 is fixed to the seat 7 in the sliding mechanism by screws. The pad 17 has mounting holes, and the needle roller 18 mates with the mounting holes. The second part includes a slide plate 19 and a fourth connecting rod 20. The slide plate 19 mates with the needle roller 18, pressing the slide plate 19 onto the needle roller 18. One end of the fourth connecting rod 20 is fixed to the slide plate 19, and the other end is fixed to the drive mechanism. A second notch 10h is provided on the support 10, and the slide plate 19 mates with the second notch 10h. Since the slide plate 19, which is fixed to the support 10, is stationary during operation, the seat 7 moves relative to the support 10 during operation. When the seat 7 moves, it drives the pad 17 to move, thereby causing the needle roller 18 mounted on the pad 17 to rotate.

[0035] To further ensure that the slide plate 19 presses against the needle roller 18, the second part also includes a plug 21 and a second spring 22. The drive mechanism has a stepped hole 10d. One end of the fourth connecting rod 20 passes through the stepped hole 10d and is fixed to the slide plate 19. The other end of the fourth connecting rod 20 is located inside the stepped hole 10d. The fourth connecting rod 20 has a shoulder. The second spring 22 is sleeved on the fourth connecting rod 20. One end of the second spring 22 abuts against the stepped surface of the stepped hole 10d, and the other end abuts against the shoulder 22a on the fourth connecting rod 20. The plug 21 is threaded into the stepped hole, and the plug 21 abuts against the other end of the fourth connecting rod 20. The elastic force of the second spring 22 drives the fourth connecting rod 20 to move, ensuring that the slide plate 19 mounted on the fourth connecting rod 20 can press against the needle roller 18.

[0036] Since there is a gap between the first gear 12 and the second rack 13 after meshing, the gap will gradually increase with normal wear of the tooth surfaces during operation. During reversing motion, the tooth surfaces are prone to collision and impact due to the gap not being eliminated, resulting in loud noise and reduced service life. Based on this, the fixture in this embodiment also includes a guide rod 23 and a third spring 24. Each sliding mechanism has a first stepped hole 7b on its seat body 7. One end of the guide rod 23 is located in the first stepped hole 7b of one of the sliding mechanisms and is fixed to that sliding mechanism. The other end of the guide rod 23 is located in the first stepped hole 7b of the other sliding mechanism and slides in cooperation with the first stepped hole 7b. The third spring 24 is sleeved on the guide rod 23, and one end of the third spring 24 abuts against the steps in the two first stepped holes 7b respectively. This structure eliminates the gap between the second rack 13 and the first gear 12 by the elastic force of the third spring 24 acting on the two seats 7.

[0037] The working process of this invention is as follows: When the linear drive component 15 drives the first rack 11 to descend along the support 10, the two first racks 11 respectively drive a first gear 12 to rotate, and the two first gears 12 drive the two second racks 13 to move towards each other, thereby causing the two seats 7 to move towards each other, and then the clamping mechanisms on the two seats 7 to move towards each other. As the clamping mechanisms continue to move towards each other, the cam surface 6a on the clamping block 6 first clamps the rotor shaft B. As the linear drive component 15 continues to output power and causes the seats 7 to continue to move linearly, since the clamping block 6 can no longer move linearly, the elastic force generated by the first spring 4 is transmitted to the clamping block 6 through the push block 5, forcing the clamping block 6 to only rotate. The cam surface 6a is a curved surface. During the rotation of the clamping block 6, the cam surface 6a generates an axial drag force on the rotor shaft B, causing the entire turbine rotor to move axially along the spacer sleeve 2, so that the axial end face of the exhaust gas impeller A and the axial end face of the spacer sleeve 2 form abutment.

Claims

1. A fixture for machining the axial end face of a turbine rotor shaft, comprising a support plate (1), a spacer sleeve (2), a sliding mechanism, a drive mechanism for driving the sliding mechanism to move linearly, and a clamping mechanism, wherein the spacer sleeve (2) is located on one side of the support plate (1) and fixed to the support plate (1), the sliding mechanism is located on the other side of the support plate (1), and there are two sliding mechanisms and two clamping mechanisms arranged opposite to each other, wherein the sliding mechanism is connected to the drive mechanism and the clamping mechanism respectively, characterized in that, The clamping mechanism includes a first connecting rod (3), a first spring (4), a push block (5), and a clamping block (6). The first connecting rod (3) is fixed to the sliding mechanism. The first spring (4) and the push block (5) are both sleeved on the first connecting rod (3). One end of the first spring (4) abuts against the sliding mechanism, and the other end of the first spring (4) abuts against the push block (5). The push block (5) abuts against the clamping block (6). The clamping block (6) is hinged to the first connecting rod (3) and hinged to the sliding mechanism. The clamping block (6) is provided with a cam surface (6a). When the drive mechanism works, the cam surface (6a) on the clamp (6) clamps the rotor shaft (B), and the clamp (6) rotates. When the clamp (6) rotates, the cam surface (6a) generates an axial drag force on the rotor shaft (B), so that the axial end of the exhaust gas impeller (A) is kept against the spacer sleeve (2).

2. The fixture for machining the axial end face of the turbine rotor shaft according to claim 1, characterized in that, The clamping block (6) is provided with a groove (6b), the surface of which is the cam surface (6a), and the surface of the cam surface (6a) is provided with a friction-enhancing component.

3. The fixture for machining the axial end face of the turbine rotor shaft according to claim 1, the sliding mechanism includes a seat (7), a linear guide assembly (8), and a second connecting rod (9). The seat (7) is fixed to the linear guide assembly (8). The seat (7) is provided with a first groove (7a). The second connecting rod (9) is located in the first groove (7a) and fixed to the seat (7). The second connecting rod (9) is provided with a first threaded hole. The first connecting rod (3) is provided with a thread. The first connecting rod (3), the first spring (4), the push block (5), and the clamping block (6) are all located in the first groove (7a). The first connecting rod (3) is threadedly connected to the first threaded hole on the second connecting rod (9). The clamping block (6) is hinged to the seat (7).

4. The fixture for machining the axial end face of the turbine rotor shaft according to claim 1, characterized in that, The drive mechanism includes a support base, a transmission assembly, and a linear driver. The linear driver is fixed to the support base. There are two sets of transmission assemblies. Each set of transmission assemblies is fixed to the linear driver, movably connected to the support base, and fixed to a sliding mechanism.

5. The fixture for machining the axial end face of the turbine rotor shaft according to claim 4, characterized in that, The support base includes two supports (10), each of which is provided with a first hole (10a), a second hole (10b), and a third hole (10c) for movably connecting with the transmission assembly. The first hole (10a) is arranged along the vertical direction of the support (10), the second hole (10b) is arranged along the front-back direction of the support (10), and the third hole (10c) is arranged along the left-right direction of the support (10). The transmission assembly includes a first rack (11), a first gear (12), and a second rack (13). The first rack (11) is fixed to the linear actuator. The first rack (11) is slidably engaged with the first hole (10a). The first gear (12) is engaged with the second hole (10b). The first gear (12) meshes with the first rack (11). The second rack (13) is slidably engaged with the third hole (10c). The second rack (13) meshes with the first gear (12). The second rack (13) is fixed to the sliding mechanism.

6. The fixture for machining the axial end face of the turbine rotor shaft according to claim 4, characterized in that, The linear actuator includes a bracket (14), a linear drive component (15), and a third link (16). The lower end of the bracket (14) is fixed to the support base, the upper end of the bracket (14) is fixed to the linear drive component (15), the third link (16) is fixed to the power output end of the linear drive component (15), and the two ends of the third link (16) are respectively fixed to two sets of transmission components.

7. The fixture for machining the axial end face of a turbine rotor shaft according to any one of claims 1 to 6, characterized in that, It also includes a sliding assembly that applies pressure to the sliding mechanism to improve the operational stability of the sliding mechanism. The sliding assembly includes a first part and a second part. The first part is fixed to the sliding mechanism, and the second part is fixed to the drive mechanism. The first part and the second part slide together.

8. The fixture for machining the axial end face of the turbine rotor shaft according to claim 7, characterized in that, The first part includes a pad (17) and a needle roller (18). The pad (17) is fixed to the sliding mechanism. The pad (17) is provided with mounting holes, and the needle roller (18) mates with the mounting holes. The second part includes a slide plate (19) and a fourth link (20). The slide plate (19) is engaged with a needle roller (18). One end of the fourth link (20) is fixed to the slide plate (19), and the other end of the fourth link (20) is fixed to the drive mechanism.

9. The fixture for machining the axial end face of a turbine rotor shaft according to claim 8, characterized in that, The second part also includes a plug (21) and a second spring (22). The drive mechanism is provided with a stepped hole (10d). One end of the fourth connecting rod (20) passes through the stepped hole (10d) and is fixed to the slide plate (19). The other end of the fourth connecting rod (20) is located in the stepped hole (10d). The fourth connecting rod (20) is provided with a shoulder. The second spring (22) is sleeved on the fourth connecting rod (20). One end of the second spring (22) abuts against the stepped surface of the stepped hole. The other end of the second spring (22) abuts against the shoulder (22a) on the fourth connecting rod (20). The plug (21) is threadedly connected to the stepped hole. The plug (21) abuts against the other end of the fourth connecting rod (20).

10. The fixture for machining the axial end face of a turbine rotor shaft according to any one of claims 1 to 6, characterized in that, It also includes a guide rod (23) and a third spring (24). Each sliding mechanism is provided with a first step hole (7b). One end of the guide rod (23) is located in the first step hole (7b) of one of the sliding mechanisms and is fixed to the sliding mechanism. The other end of the guide rod (23) is located in the first step hole (7b) of another sliding mechanism and is slidably engaged with the first step hole (7b). The third spring (24) is sleeved on the guide rod (23). One end of the third spring (24) abuts against the steps in the two first step holes (7b) respectively.

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