Composite cradle rotary table of five-axis milling machine

Abstract

A torque motor is arranged in an inner cavity of a cradle base, a stator of an outer ring of the torque motor is downwards and fixedly connected with the bottom end face of the cradle base through a first connecting flange, and the lower end face of a rotor of an inner ring of the torque motor is fixedly connected with a lower end step of a main shaft through a second connecting flange; above the torque motor, the main shaft is supported in the cradle base through a bearing, the upper end face of the main shaft is fixedly connected with the workbench, and the bottom end of the main shaft is fixedly connected with a brake pad; a cooling disc is arranged in an annular space formed by the cradle base, the main shaft, the torque motor and the bearing; and a brake hydraulic cylinder is fixedly connected in an annular space at the bottom of the cradle base. The invention belongs to the technical field of machine tool equipment, and is perfect in structure arrangement, and the precision, stability and reliability in the operation process are obviously improved.

Description

Technical Field

[0001] This invention belongs to the field of machine tool equipment technology, and relates to a five-axis milling and turning composite cradle rotary table. Background Technology

[0002] As modern manufacturing moves towards multi-process integration, high precision, and high efficiency, five-axis milling and turning machining centers have become key equipment in the field of high-end equipment manufacturing because they can complete multi-face machining of complex parts in a single setup.

[0003] The existing five-axis milling and turning cradle turntables have a highly concentrated spatial layout. Due to the presence of multiple heat sources, such as motors, turntable bearings, and braking components, and the fact that turntable bearings and braking components are also sources of leakage and pollution, the following shortcomings arise: 1) Uncontrolled thermal deformation leads to poor precision stability: The existing turntable's ring-shaped braking structure, turntable bearings, and motors are concentrated in the area below the worktable. During operation, the heat sources interfere with each other, making isolation difficult and resulting in poor overall precision stability of the equipment during operation; 2) Lubricating grease overflowing from the turntable bearings inevitably seeps into the adjacent motor below, easily inducing generator failure; 3) The built-in ring-shaped braking structure's clamping force directly twists the worktable support system, and the internal hydraulic pipelines have a high risk of leakage and are extremely inconvenient to maintain. This design of coupled interference sources is the fundamental structural bottleneck restricting the turntable from maintaining high precision, high stability, and high reliability in the long term.

[0004] Therefore, it is urgent to improve the existing five-axis milling turntable structure to overcome the above-mentioned shortcomings and improve the accuracy, stability and reliability of the existing five-axis milling turntable. Summary of the Invention

[0005] The purpose of this invention is to provide a five-axis milling and turning composite cradle turntable, which solves the problems of insufficient accuracy, stability and reliability in the operation of existing five-axis milling and turning cradle turntables due to imperfect structural design.

[0006] The technical solution adopted in this invention is a five-axis milling and turning composite cradle turntable, including a cradle base. A torque motor is installed in the inner cavity of the cradle base. The stator of the outer ring of the torque motor is fixedly connected downward to the bottom end face of the cradle base through a connecting flange one. The lower end face of the rotor of the inner ring of the torque motor is fixedly connected to the lower end step of the spindle through a connecting flange two. Above the torque motor, the spindle is supported in the cradle base by bearings. The upper end face of the spindle is fixedly connected to the worktable, and a brake pad is fixedly connected to the bottom end of the spindle. A cooling plate is installed in the annular space formed by the cradle base, the spindle, the torque motor, and the bearings. A brake hydraulic cylinder is fixedly connected in the bottom annular space of the cradle base.

[0007] The five-axis milling and turning composite cradle turntable of the present invention is further characterized in that: Above the torque motor, the outer ring of the main shaft is fixedly connected to the inner ring of the bearing by bolts, and the outer ring of the bearing is fixedly connected to the upper step of the cradle base.

[0008] A brake piston is installed in the upward-facing annular groove of the brake hydraulic cylinder. Multiple disc springs are installed at the bottom of the brake hydraulic cylinder, and the inner end of each disc spring is hooked and connected to the brake piston. The brake hydraulic cylinder is provided with a brake fluid interface.

[0009] The brake pads are installed below the torque motor, and a fixing component is fixedly installed at the bottom of the cradle base. The fixing component is installed above the brake pads.

[0010] The cooling plate is structured as follows: it consists of an annular upper cover plate and a lower cover plate that are fastened together. The upper cover plate and the lower cover plate are respectively provided with inner and outer mounting edges. The upper cover plate and the lower cover plate are fixedly connected by two rings of cover plate connecting screws. The internal space formed by the fastening of the upper cover plate and the lower cover plate has symmetrical coolant flow channels arranged along the circumference.

[0011] The lower cover plate has coolant inlet and coolant outlet on both sides of its diameter.

[0012] The top cover plate is machined with sealing ring groove one and sealing ring groove two. Sealing ring one and sealing ring two are installed in the two sealing ring grooves respectively. Sealing ring groove two is located on the outer side of the inner mounting edge, and sealing ring groove one is located on the inner side of the outer mounting edge. Furthermore, sealing ring groove one needs to avoid the coolant flow channel inlet and coolant flow channel outlet at both ends in the diameter direction.

[0013] Both sealing ring one and sealing ring two are O-rings made of nitrile rubber.

[0014] The beneficial effects of this invention are that the five-axis milling and turning composite cradle turntable device adopts a "functional area isolation and interference source blocking" arrangement. Through innovative spatial layout and structural design, the main heat source (motor), leakage pollution source (bearing), and braking function are spatially partitioned and physically separated, thereby ensuring the accuracy, stability, and reliability of the turntable. Specifically, this includes the following aspects: 1) Achieving system decoupling of the accuracy interference source: By setting a cooling plate, the problem of heat conduction blocking and grease contamination isolation is solved simultaneously using a single structural component, maximizing efficiency by utilizing existing space; 2) Reconstructing the braking force transmission path: An external axial braking module is used. Not only is it easy to maintain, but it also moves the clamping force and heat source that may cause deformation from the core support system of the worktable to the outside, and the braking force is borne by the bottom of the base, which greatly improves the accuracy and stability; 3) It improves the reliability and maintainability of the system. The sealed flow channel design of the cooling plate eliminates the risk of internal coolant leakage. The brake components and pipelines are externalized, making the leakage risk externalized and visible. Moreover, the replacement of vulnerable parts such as disc springs and brake pads does not require disassembling the turntable body and the worktable, which greatly shortens the maintenance downtime; 4) The overall structure is compact. The above innovations are achieved without increasing the overall axial dimension of the turntable, and high precision, stability and reliability are achieved simultaneously in a limited space. Attached Figure Description

[0015] Figure 1 This is a cross-sectional view of the overall structure of the device of the present invention; Figure 2 This is a schematic diagram of the interface between the brake module and the cooling plate in the device of the present invention; Figure 3 This is a schematic diagram of the internal flow channel arrangement of the cooling plate in the device of the present invention; Figure 4 This is a schematic diagram of the cooling plate sealing structure arrangement in the device of the present invention.

[0016] In the diagram, 1. Upper cover plate, 2. Lower cover plate, 4. Sealing ring one, 5. Sealing ring two, 7. Worktable, 8. Bearing, 9. Cradle base, 10. Torque motor, 11. Brake hydraulic cylinder, 12. Spindle, 13. Coolant inlet, 14. Coolant outlet, 15. Brake piston, 16. Brake pad, 17. Disc spring, 18. Cooling plate, 19. Connecting flange one, 20. Connecting flange two, 21. Fixing component, 22. Brake oil interface; 101. Sealing ring groove one, 102. Sealing ring groove two, 201. Coolant flow channel, 202. Coolant flow channel inlet, 203. Coolant flow channel outlet, 204. Coolant inlet channel, 205. Coolant outlet channel. Detailed Implementation

[0017] The present invention will now be described in detail with reference to the accompanying drawings and specific embodiments.

[0018] Reference Figure 1 The overall structure of the device of the present invention includes a cradle base 9. A torque motor 10 is installed in the inner cavity of the cradle base 9. The stator of the outer ring of the torque motor 10 is fixedly connected downward to the bottom end face of the cradle base 9 through a connecting flange 19. The lower end face of the rotor of the inner ring of the torque motor 10 is fixedly connected to the lower step of the main shaft 12 through a connecting flange 20, thereby realizing the transmission of power to the main shaft 12. Above the torque motor 10, the outer ring of the main shaft 12 is fixedly connected to the inner ring of the bearing 8 by bolts. The outer ring of the bearing 8 is fixedly connected to the upper step of the cradle base 9, forming a main shaft 12. The main spindle 12 is rotated and supported; the upper end face of the main spindle 12 is fixedly connected to the worktable 7 to form a machining bearing platform; a replaceable brake pad 16 is fixedly connected to the bottom end of the main spindle 12. The installation position of the brake pad 16 is significantly lower than that of the torque motor 10 to provide a fit for the braking structure. Corresponding to the brake pad 16, a fixing member 21 is fixedly installed at the bottom of the cradle base 9. The installation position of the fixing member 21 is slightly higher than that of the brake pad 16. When braking, the brake piston 15 pushes against the brake pad 16 from bottom to top to generate friction. The brake pad 16 is tilted upward and limited by the fixing member 21, which together achieves the braking effect. A cooling plate 18 is installed in the annular space formed by the cradle base 9, main shaft 12, torque motor 10, and bearing 8. The outer mounting edge of the cooling plate 18 is supported (overlapped) on the middle step of the inner wall of the cradle base 9, and the outer mounting edge is fixed to the upper surface of the middle step by a ring of cooling plate mounting screws. A coolant inlet channel 204 and a coolant outlet channel 205 are respectively opened inside the middle step. The external interface of the coolant inlet channel 204 is a coolant inlet 13, and the external interface of the coolant outlet channel 205 is a coolant outlet 14. Both the coolant inlet 13 and the coolant outlet 14 are fixedly installed at the bottom of the cradle base 9. Figure 2 .

[0019] Reference Figure 2 A (disc-shaped) brake hydraulic cylinder 11 is fixedly connected to the bottom of the cradle base 9. A brake piston 15 is installed in the upward annular groove of the brake hydraulic cylinder 11. The brake piston 15 is a complete circular structure. Multiple disc springs 17 (arranged in a circle) are installed at the bottom of the brake hydraulic cylinder 11. The inner end of each disc spring 17 is hooked and connected to the brake piston 15 for the downward reset of the brake piston 15. The brake hydraulic cylinder 11 is provided with a brake oil interface 22.

[0020] Reference Figure 3The structure of the cooling plate 18 is formed by interlocking an annular upper cover plate 1 and a lower cover plate 2. Both the upper cover plate 1 and the lower cover plate 2 are made of metal. The annular upper cover plate 1 and the lower cover plate 2 are respectively provided with inner mounting edges and outer mounting edges. The upper cover plate 1 and the lower cover plate 2 are fixedly connected by two rings of cover plate connecting screws. In the internal space formed by the interlocking of the upper cover plate 1 and the lower cover plate 2, a symmetrical annular rotating labyrinth-like coolant flow channel 201 is provided along the circumference. The lower cover plate 2 has a coolant flow channel inlet 202 and a coolant flow channel outlet 203 on both sides of its diameter. Reference Figure 4 The upper cover plate 1 is machined with a sealing ring groove 101 and a sealing ring groove 102. The sealing ring groove 102 is located on the outer side of the inner mounting edge, and the sealing ring groove 101 is located on the inner side of the outer mounting edge. The sealing ring groove 101 needs to avoid the coolant inlet 202 and coolant outlet 203 at both ends in the diameter direction. The two sealing ring grooves are respectively equipped with sealing ring 4 and sealing ring 5, so that after the upper cover plate 1 and the lower cover plate 2 are fastened together with bolts, the coolant in the coolant channel 201 will not leak along the joint gap between the upper cover plate 1 and the lower cover plate 2. Both sealing ring 4 and sealing ring 5 are O-rings made of nitrile rubber.

[0021] The coolant flows from the coolant inlet 13, through the coolant inlet channel 204 and the coolant inlet 202 of the lower cover plate 2, into the coolant channel 201. It then travels along the coolant channel 201 in a meandering manner to exchange heat. The heated coolant flows out of the lower cover plate 2 from the coolant channel outlet 203 and is discharged through the coolant outlet channel 205 and the coolant inlet 14, completing the circulation.

[0022] Reference Figure 1 and Figure 3 The working principle of the device of the present invention is as follows: Connect the coolant inlet 13 and coolant outlet 14 to the external water cooling equipment respectively, and circulate cold water; at the same time, connect the brake fluid interface 22 to the external hydraulic equipment; then the torque motor 10 is powered on and started, and the torque motor 10 drives the spindle 12 to rotate normally. The spindle 12 drives the lower brake pad 16 and the upper worktable 7 to rotate synchronously, so as to realize the normal rotation of the cradle turntable.

[0023] When braking is required, the external hydraulic equipment is activated, and high-pressure brake oil is injected into the brake hydraulic cylinder 11 through the brake oil port 22 at the lower end of the cradle turntable. This pushes the brake piston 15 to move vertically upward and squeeze the brake pad 16. The brake pad 16 deforms slightly upward and is rigidly limited by the fixing part 21, generating friction to prevent the brake pad 16 from rotating, thereby stopping the main shaft 12 from rotating and realizing the braking action of the cradle turntable. When the turntable needs to be restarted, the oil supply pressure of the external hydraulic equipment is removed, the oil chamber of the brake hydraulic cylinder 11 is depressurized, the brake piston 15 loses its upward power, and the elastic tension of the disc spring 17 drives the brake piston 15 to return to its downward position, so that the brake piston 15 is disengaged from the brake pad 16, and the brake pad 16 is also disengaged from the fixing member 21. The main shaft 12 can resume normal rotation after losing resistance.

[0024] During normal operation, the heat radiation generated by the torque motor 10 is transferred upwards. This heat radiation is absorbed by the lower cover plate 2 and conducted to the coolant in the internal coolant channel 201. After being absorbed by the coolant, the heat flows out of the cradle turntable through circulation and is finally released in the external heat exchanger. This effectively blocks the heat transfer to the bearing 8 and the worktable 7 above, ensuring the accuracy and stability of the cradle turntable. At the same time, the bearing 8 will produce lubricating grease dripping during operation, which is blocked by the upper cover plate 1, preventing the lubricating grease from directly contacting the torque motor 10. This reduces the corrosion of the torque motor 10 by the lubricating grease and extends the overall service life of the device.

[0025] In the long-term use of the device of the present invention, the disc spring 17 is externally located at the bottom of the brake hydraulic cylinder 11 and the cradle turntable, allowing for direct observation of its failure status. When the disc spring 17 fails due to long-term use, causing uneven distribution of braking force, it can be replaced directly from the bottom of the cradle turntable without additional disassembly. When the brake pad 16 needs to be replaced due to long-term wear, it can be replaced simply by disassembling the connecting part between the brake hydraulic cylinder 11 and the cradle base 9, greatly improving the convenience of maintenance and replacement of the brake module.

[0026] Example 1 The five-axis vertical machining center in this embodiment 1 uses the milling-turning composite cradle turntable of the present invention to perform aero-engine impeller machining.

[0027] The structure of the milling and turning composite cradle turntable is as follows: a torque motor 10 is installed in the inner cavity of the cradle base 9. The stator of the outer ring of the torque motor 10 is fixedly connected to the bottom end face of the cradle base 9 via a connecting flange 19. The lower end face of the rotor of the inner ring of the torque motor 10 is fixedly connected to the lower step of the spindle 12 via a connecting flange 20. Above the torque motor 10, the outer ring of the spindle 12 is fixedly connected to the inner ring of the bearing 8 via bolts. The outer ring of the bearing 8 is fixedly connected to the upper step of the cradle base 9. The upper end face of the spindle 12 is fixedly connected to the worktable 7. A replaceable brake pad 16 is fixedly connected to the bottom end of the spindle 12. The installation position of the brake pad 16 is significantly lower than that of the torque motor 10. Corresponding to the brake pad 16, a fixing component 21 is fixedly installed at the bottom of the cradle base 9. The installation position of the fixing component 21 is slightly higher than that of the brake pad 16. A cooling plate 18 is provided in the annular space formed by the cradle base 9, the main shaft 12, the torque motor 10, and the bearing 8. The outer mounting edge of the cooling plate 18 is supported on the middle step of the inner wall of the cradle base 9, and the outer mounting edge is fixed to the upper surface of the middle step by a ring of cooling plate mounting screws. The middle step has a coolant inlet channel 204 and a coolant outlet channel 205 respectively. The external interface of the coolant inlet channel 204 is the coolant inlet 13, and the external interface of the coolant outlet channel 205 is the coolant outlet 14. Both the coolant inlet 13 and the coolant outlet 14 are fixedly set at the bottom of the cradle base 9.

[0028] Reference Figure 2 A brake hydraulic cylinder 11 is fixedly connected to the bottom of the cradle base 9 in the annular space. A brake piston 15 is installed in the upward annular groove of the brake hydraulic cylinder 11. The brake piston 15 is a complete circular structure. Eight disc springs 17 are installed at the bottom of the brake hydraulic cylinder 11. The inner end of each disc spring 17 is hooked and connected to the brake piston 15. The brake hydraulic cylinder 11 is provided with a brake oil interface 22.

[0029] The milling-turning composite cradle turntable ran continuously for 30 days, and the precision of the machined impeller parts was tested. All dimensional accuracy and geometric tolerances met the design requirements. Moreover, the milling-turning composite cradle turntable did not experience any downtime or performance degradation during the entire machining process, which verifies the stable operation capability and reliability of the device of this invention in the long-term machining of high-precision parts.

[0030] Example 2 The five-axis vertical machining center in this embodiment 2 uses the milling-turning composite cradle turntable of the present invention to process aluminum alloy intake fan discs.

[0031] Based on the structure of Embodiment 1, a cooling plate 18 is also included, which is formed by the interlocking of an annular upper cover plate 1 and a lower cover plate 2. Both the upper cover plate 1 and the lower cover plate 2 are made of metal. The annular upper cover plate 1 and the lower cover plate 2 are respectively provided with inner mounting edges and outer mounting edges. The upper cover plate 1 and the lower cover plate 2 are fixedly connected by two rings of cover plate connecting screws. In the internal space formed by the interlocking of the upper cover plate 1 and the lower cover plate 2, a symmetrical annular rotating labyrinth-like coolant flow channel 201 is provided along the circumferential direction. The lower cover plate 2 has a coolant flow channel inlet 202 and a coolant flow channel outlet 203 on both sides of its diameter.

[0032] The milling-turning composite cradle turntable ran continuously for 45 days, and the precision of the machined impeller parts was tested. All dimensional accuracy and geometric tolerances met the design requirements. Moreover, the milling-turning composite cradle turntable did not experience any downtime or performance degradation during the entire machining process, which verifies the stable operation capability and reliability of the device of the present invention in the long-term machining of high-precision parts.

[0033] Example 3 The five-axis vertical machining center in this embodiment 3 uses the milling and turning composite cradle turntable of the present invention to process aluminum alloy tire molds.

[0034] Based on the structure of Embodiment 2, it further includes a sealing ring groove 101 and a sealing ring groove 102 machined on the upper cover plate 1. The sealing ring groove 102 is located on the outer side of the inner mounting edge, and the sealing ring groove 101 is located on the inner side of the outer mounting edge. The sealing ring groove 101 needs to avoid the coolant inlet 202 and coolant outlet 203 at both ends in the diameter direction. The two sealing ring grooves are respectively equipped with sealing ring 4 and sealing ring 5, so that after the upper cover plate 1 and the lower cover plate 2 are fastened together with bolts, the coolant in the coolant channel 201 will not leak along the joint gap between the upper cover plate 1 and the lower cover plate 2. Both sealing ring 4 and sealing ring 5 are O-rings made of nitrile rubber.

[0035] The milling-turning composite cradle turntable ran continuously for 50 days, and the precision of the machined impeller parts was tested. All dimensional accuracy and geometric tolerances met the design requirements. Moreover, the milling-turning composite cradle turntable did not experience any downtime or performance degradation during the entire machining process, which verifies the stable operation capability and reliability of the device of this invention in the long-term machining of high-precision parts.

[0036] Example 4 The five-axis horizontal machining center in this embodiment 4 uses the milling-turning composite cradle turntable of the structure in embodiment 1 of the present invention to machine the gearbox housing.

[0037] The milling-turning composite cradle turntable ran continuously for 45 days, and the precision of the machined impeller parts was tested. All dimensional accuracy and geometric tolerances met the design requirements. Moreover, the milling-turning composite cradle turntable did not experience any downtime or performance degradation during the entire machining process, which verifies the stable operation capability and reliability of the device of the present invention in the long-term machining of high-precision parts.

[0038] Example 5 The five-axis horizontal machining center in this embodiment 5 uses a milling and turning composite cradle turntable with the structure of embodiment 2 of the present invention to machine stainless steel engine casings.

[0039] The milling-turning composite cradle turntable ran continuously for 60 days, and the precision of the machined impeller parts was tested. All dimensional accuracy and geometric tolerances met the design requirements. Moreover, the milling-turning composite cradle turntable did not experience any downtime or performance degradation during the entire machining process, which verifies the stable operation capability and reliability of the device of the present invention in the long-term machining of high-precision parts.

[0040] Example 6 The five-axis horizontal machining center in this embodiment 6 uses a milling and turning composite cradle turntable with the structure of embodiment 3 of the present invention to perform stainless steel steering knuckle machining.

[0041] The milling-turning composite cradle turntable ran continuously for 45 days, and the precision of the machined impeller parts was tested. All dimensional accuracy and geometric tolerances met the design requirements. Moreover, the milling-turning composite cradle turntable did not experience any downtime or performance degradation during the entire machining process, which verifies the stable operation capability and reliability of the device of the present invention in the long-term machining of high-precision parts.

Claims

1. A five-axis milling and turning composite cradle turntable, characterized in that: The cradle base (9) is included. A torque motor (10) is installed in the inner cavity of the cradle base (9). The stator of the outer ring of the torque motor (10) is fixedly connected to the bottom end face of the cradle base (9) through a connecting flange one (19). The lower end face of the rotor of the inner ring of the torque motor (10) is fixedly connected to the lower end step of the main shaft (12) through a connecting flange two (20). Above the torque motor (10), the main shaft (12) is supported in the cradle base (9) by a bearing (8). The upper end face of the main shaft (12) is fixedly connected to the worktable (7). A brake pad (16) is fixedly connected to the bottom end of the main shaft (12). A cooling plate (18) is installed in the annular space formed by the cradle base (9), the main shaft (12), the torque motor (10), and the bearing (8). A brake hydraulic cylinder (11) is fixedly connected in the bottom annular space of the cradle base (9).

2. The five-axis milling and turning composite cradle turntable according to claim 1, characterized in that, Above the torque motor (10), the outer ring of the main shaft (12) is fixedly connected to the inner ring of the bearing (8) by bolts, and the outer ring of the bearing (8) is fixedly connected to the upper step of the cradle base (9).

3. The five-axis milling and turning composite cradle turntable according to claim 1, characterized in that, The brake hydraulic cylinder (11) has a brake piston (15) installed in the upward annular groove. Multiple disc springs (17) are installed at the bottom of the brake hydraulic cylinder (11). The inner end of each disc spring (17) is hooked and connected to the brake piston (15). The brake hydraulic cylinder (11) is provided with a brake oil interface (22).

4. The five-axis milling and turning composite cradle turntable according to claim 1, characterized in that, The brake pad (16) is installed at a position lower than the torque motor (10), and a fixing member (21) is fixedly installed at the bottom of the cradle base (9). The fixing member (21) is installed at a position higher than the brake pad (16).

5. The five-axis milling and turning composite cradle turntable according to claim 1, characterized in that, The structure of the cooling plate (18) is formed by a ring-shaped upper cover plate (1) and a lower cover plate (2) being fastened together. The upper cover plate (1) and the lower cover plate (2) are respectively provided with inner mounting edges and outer mounting edges. The upper cover plate (1) and the lower cover plate (2) are fixedly connected by two rings of cover plate connecting screws. The internal space formed by the fastening of the upper cover plate (1) and the lower cover plate (2) is provided with symmetrical coolant flow channels (201) along the circumferential direction.

6. The five-axis milling and turning composite cradle turntable according to claim 5, characterized in that, The lower cover plate (2) has a coolant inlet (202) and a coolant outlet (203) on both sides of its diameter.

7. The five-axis milling and turning composite cradle turntable according to claim 5, characterized in that, The upper cover plate (1) is machined with a sealing ring groove 1 (101) and a sealing ring groove 2 (102). A sealing ring 1 (4) and a sealing ring 2 (5) are respectively installed in the two sealing ring grooves. The sealing ring groove 2 (102) is located on the outer side of the inner mounting edge, and the sealing ring groove 1 (101) is located on the inner side of the outer mounting edge. The sealing ring groove 1 (101) needs to avoid the coolant flow channel inlet (202) and coolant flow channel outlet (203) at both ends in the diameter direction.

8. The five-axis milling and turning composite cradle turntable according to claim 7, characterized in that, Both the sealing ring one (4) and the sealing ring two (5) are O-rings made of nitrile rubber.

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