An ultra-precision five-axis tilting CNC indexing turntable

Abstract

The present invention relates to the technical field of indexing turntables, and discloses an ultra-precision five-axis tilting CNC indexing turntable. The present invention comprises: a spindle box, a turntable drive assembly is arranged on the driving shaft of the spindle box, the turntable drive assembly comprises a housing, a shaft rotatably mounted in the housing, a worm gear sleeved on the shaft, and a workbench arranged at the top end of the shaft, a precision worm mechanism for driving the worm gear and a motor for driving the precision worm mechanism are arranged in the housing; the precision worm mechanism comprises a main worm rotatably mounted in the housing and axially movable and meshing with the worm gear, a slide cylinder is arranged at one end of the main worm, an axially movable adjusting rod is arranged in the slide cylinder, and a slider is arranged at one end of the adjusting rod in the slide cylinder. The present invention can allow the worm to automatically move axially when wear occurs between the transmission teeth of the worm gear, so as to achieve precise meshing with the worm gear, thereby ensuring the accuracy of the indexing turntable.

Description

Technical Field

[0001] The invention relates to the technical field of indexing turntables, and in particular to an ultra-precision five-axis tilting CNC indexing turntable. Background Art

[0002] CNC indexing turntable is a key component in CNC machining. It is mainly used to realize circular rotation motion to achieve the purpose of indexing or equal division. CNC indexing turntable can expand the processing capacity of CNC machine tools, enabling them to complete more complex processing tasks. With the transformation and upgrading of the manufacturing industry, the demand for high-precision, high-efficiency and high-flexibility processing is growing. Traditional three-axis CNC machine tools are unable to cope with the processing of complex curved surfaces and special-shaped workpieces, and it is difficult to meet the requirements of high precision and complexity. Therefore, five-axis or even more-axis CNC machining technology came into being. Among them, the ultra-precision five-axis tilting CNC indexing turntable integrates the movement capabilities of five coordinate axes (usually including three linear axes X, Y, Z and two rotation axes A (rotating around the X axis) and C (rotating around the Z axis)). It is good at spatial curved surface processing, special-shaped processing, hollowing processing, punching, oblique holes, bevel cutting, etc., to achieve ultra-precision processing.

[0003] In the existing five-axis tilt CNC indexing turntable, the rotation of the turntable is mainly driven by the combination of a worm and a worm gear. However, the meshing transmission mode between the worm and the worm gear has the problems of large friction and wear. During long-term operation, the wear of the transmission tooth surface of the worm and the worm gear will cause the meshing clearance to increase, which will affect the transmission accuracy. Therefore, it is necessary to propose an ultra-precision five-axis tilting CNC indexing turntable. Summary of the invention

[0004] In order to solve the above technical problems, the present invention provides an ultra-precision five-axis tilting CNC indexing turntable.

[0005] The present invention is implemented by the following technical scheme: a spindle box, a turntable drive assembly is arranged on the driving shaft of the spindle box, the turntable drive assembly comprises a housing, a shaft rotatably mounted in the housing, a worm gear sleeved on the shaft, and a workbench arranged at the top end of the shaft, a precision worm mechanism for driving the worm gear and a motor for driving the precision worm mechanism are arranged in the housing;

[0006] The precision worm mechanism includes a main worm which is rotatably installed in the outer shell and can move axially and mesh with the worm wheel. One end of the main worm is provided with a slide cylinder, and an adjusting rod which can move axially is provided in the slide cylinder. A slider is provided at one end of the adjusting rod which is in the slide cylinder, and two springs on both sides of the slider are provided in the slide cylinder. An external threaded ring is provided on the adjusting rod, and an internal threaded ring which is fixedly connected to the inner wall of the outer shell is threadedly sleeved on the external threaded ring. When the adjusting rod rotates, the external threaded ring on it will drive the adjusting rod to move axially under the action of the internal threaded ring, and in the process of movement, the spring, the slide cylinder and the main worm are pushed by the slider, forcing the main worm to move axially and thereby precisely mesh with the worm wheel.

[0007] As a further improvement of the above scheme, a transmission cylinder is rotatably installed in the outer shell, a first foot groove is provided at one end of the transmission cylinder, one end of the adjusting rod extends into the first foot groove and is slidably connected with the first foot groove, and the transmission cylinder is transmission connected to the motor, so that the adjusting rod can maintain a transmission connection with the motor while performing axial movement.

[0008] As a further improvement of the above scheme, a hexagonal groove is provided on the inner wall of one end of the slide cylinder, and a hexagonal shaft is provided on one side of the slider. One end of the hexagonal shaft extends into the hexagonal groove and is slidably connected to the hexagonal groove, so that the adjusting rod can not only move axially to adjust the main worm gear, but also drive the main worm gear to rotate normally.

[0009] As a further improvement of the above scheme, a second clamping foot groove is provided at one end of the main worm gear, and a first limiting rod is slidably inserted in the second clamping foot groove. The other end of the first limiting rod is rotatably connected to the outer shell, thereby supporting one end of the main worm gear and ensuring that the main worm gear can stably move or rotate axially.

[0010] As a further improvement of the above scheme, two connecting frames are rotatably mounted on the main worm, and a secondary worm that is transmission-connected to the main worm and meshes with the worm wheel is rotatably installed on the other end of the two connecting frames, so that the main worm can simultaneously drive the secondary worm to move together when it moves axially. The cooperation between the two can offset the worm wheel, thereby preventing the worm wheel from rotating when the main worm moves axially.

[0011] As a further improvement of the above solution, a second limiting rod is rotatably installed in the outer shell, a clamping foot through hole is provided on the auxiliary worm gear, and the second limiting rod passes through the clamping foot through hole and is slidably connected thereto.

[0012] As a further improvement of the above solution, the two sides of the internal thread ring are concave structures, which not only ensures the compactness of the structure, but also ensures that the adjusting rod will not be restricted by the internal thread ring when driving the slide cylinder to move.

[0013] As a further improvement of the above scheme, oil holes are provided on the clamping foot holes, so that the clamping foot holes can accommodate more grease or allow the lubricating oil to enter the clamping foot holes for better lubrication, thereby reducing the wear of the second limiting rod.

[0014] Compared with the prior art, the present invention has the following beneficial effects:

[0015] The precision worm mechanism is composed of the adjustment rod, external thread ring, internal thread ring, slider, slide cylinder and spring. Compared with the traditional fixed worm, it can automatically complete axial movement when rotating, so that after the transmission teeth of the worm wheel are worn and the meshing precision decreases, it can rely on axial displacement adjustment to achieve precise meshing again, and when reversing, it can also achieve reverse axial movement, so as to meet the forward and reverse rotation requirements while ensuring the transmission precision between the worm wheel and the worm, and thus ensure the precision of the entire indexing turntable;

[0016] By arranging an external thread ring on the adjusting rod and arranging an internal thread ring which can be threadedly connected with the external thread ring on the inner wall of the shell, an axial adjustment driving structure of the precision worm mechanism is formed, which makes it possible for the axial movement of the adjusting rod to be realized by self-rotation instead of relying on an external driving device, thereby satisfying the bidirectional axial displacement of the precision worm mechanism and not affecting the normal rotation of the precision worm mechanism, and the whole adjustment process does not require human intervention;

[0017] By setting up a secondary worm that can rotate and move synchronously with the main worm, the main worm can also drive the secondary worm to move synchronously when it is adjusted axially. When the two move synchronously, they will both hold the worm wheel against the worm wheel. The advantage of this design is that it will not affect the normal transmission of the main worm to the worm wheel, and it also solves the problem that the worm wheel is easily rotated when the main worm moves axially. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 This is an overall display diagram of the ultra-precision five-axis tilt CNC indexing turntable of the present invention;

[0019] Figure 2 This is a cross-section diagram of the ultra-precision five-axis tilt CNC indexing turntable of the present invention;

[0020] Figure 3 This is a disassembled display diagram of the ultra-precision five-axis tilt CNC indexing turntable of the present invention;

[0021] Figure 4 This is a diagram showing the internal structure of the ultra-precision five-axis tilt CNC indexing turntable of the present invention;

[0022] Figure 5It is a planar cross-sectional view showing the precision worm mechanism and the motor;

[0023] Figure 6 It is a three-dimensional partial cross-sectional view showing the precision worm mechanism and the motor;

[0024] Figure 7 This is a partial disassembled cross-sectional view showing the structure of the precision worm gear mechanism;

[0025] Figure 8 The figure is a disassembled display diagram of the auxiliary worm gear and the second limiting rod;

[0026] Fig. 9 It is a cross-sectional view showing the auxiliary worm gear and the second limiting rod.

[0027] Description of main symbols:

[0028] 1. Spindle box; 2. Housing; 3. Motor; 4. Transmission cylinder; 5. Adjustment rod; 6. External thread ring; 7. Internal thread ring; 8. Sliding block; 9. Sliding cylinder; 10. Spring; 11. Main worm; 12. First limiting rod; 13. Shaft; 14. Worm wheel; 15. Workbench; 16. Second limiting rod; 17. Secondary worm; 18. Connecting frame; 19. Oil hole. DETAILED DESCRIPTION

[0029] The present invention is further described below in conjunction with the accompanying drawings and specific implementation methods.

[0030] Please combine Figures 1 to 9 The ultra-precision five-axis tilt CNC indexing turntable comprises: a spindle box 1, a turntable driving assembly is arranged on the driving shaft of the spindle box 1, the turntable driving assembly comprises a housing 2, a shaft 13 rotatably mounted in the housing 2, a worm gear 14 fixedly sleeved on the shaft 13, and a workbench 15 fixedly mounted on the top of the shaft 13, a precision worm mechanism for driving the worm gear 14 and a motor 3 for driving the precision worm mechanism are arranged in the housing 2;

[0031] The precision worm mechanism includes a main worm 11 which is rotatably mounted in the housing 2 and can move axially and mesh with the worm wheel 14. A slide cylinder 9 is fixedly mounted on one end of the main worm 11. The slide cylinder 9 consists of a cylinder body and a cylinder cover threadedly connected to the cylinder body, so that the slide cylinder 9 can be easily disassembled and assembled. An adjusting rod 5 which can move axially is telescopically mounted in the slide cylinder 9. A slider 8 is fixedly mounted on one end of the adjusting rod 5 in the slide cylinder 9. Two springs 10 located on both sides of the slider 8 are arranged in the slide cylinder 9. A hexagonal groove is arranged on the inner wall of one end of the slide cylinder 9. A hexagonal shaft is arranged on one side of the slider 8. One end of the hexagonal shaft extends into the hexagonal groove and is slidably connected to the hexagonal groove, so that the adjusting rod 5 can move axially to realize The main worm 11 can be adjusted and the main worm 11 can be driven to rotate normally. An external threaded ring 6 is provided on the adjusting rod 5. An internal threaded ring 7 fixedly connected to the inner wall of the outer shell 2 is threadedly sleeved on the external threaded ring 6. When the adjusting rod 5 rotates, the external threaded ring 6 thereon drives the adjusting rod 5 to move axially under the action of the internal threaded ring 7. During the movement, the spring 10, the slide cylinder 9 and the main worm 11 are pushed by the slider 8, forcing the main worm 11 to move axially and thereby precisely mesh with the worm wheel 14. In addition, the two sides of the internal threaded ring 7 are concave structures, which not only ensures the compactness of the structure, but also ensures that the adjusting rod 5 will not be restricted by the internal threaded ring 7 when driving the slide cylinder 9 to move.

[0032] Through the above technical solution, compared with the traditional fixed worm, it can automatically complete axial movement when rotating, so that after the transmission teeth of the worm wheel 14 are worn and the meshing precision decreases, it can rely on axial displacement adjustment to achieve precise meshing again, and when reversing, it can also achieve reverse axial movement, so as to meet the forward and reverse rotation requirements while ensuring the transmission precision between the worm wheel and the worm, and thus ensure the precision of the entire indexing turntable;

[0033] In addition, by providing an external threaded ring 6 on the adjusting rod 5 and providing an internal threaded ring 7 on the inner wall of the outer shell 2 which can be threadedly connected to the external threaded ring 6, an axial adjustment drive structure of the precision worm mechanism is formed, which makes it possible for the axial movement of the adjusting rod 5 to be achieved by self-rotation instead of relying on an external drive device, thereby satisfying the bidirectional axial displacement of the precision worm mechanism and not affecting the normal rotation of the precision worm mechanism, and the entire adjustment process does not require human intervention.

[0034] Please combine Figure 7 and Figure 8A transmission cylinder 4 is rotatably installed in the outer shell 2, and a first foot groove is provided at one end of the transmission cylinder 4. One end of the adjusting rod 5 extends into the first foot groove and is slidably connected with the first foot groove. The transmission cylinder 4 and the motor 3 are meshed through a bevel gear, so that the adjusting rod 5 can maintain a transmission connection with the motor 3 while performing axial movement. A second foot groove is provided at one end of the main worm 11, and a first limiting rod 12 is slidably inserted in the second foot groove. The other end of the first limiting rod 12 is rotatably connected to the outer shell 2, so as to support one end of the main worm 11 and ensure that the main worm 11 can stably perform axial movement or rotation.

[0035] Through the above technical solution, the main worm 11 can not only realize axial movement, but also be stably installed in the housing 2 to ensure its own stability, and the motor 3 can realize smooth driving of the main worm 11 .

[0036] Please combine Figures 5 to 8 Two connecting frames 18 are rotatably mounted on the main worm 11, and a secondary worm 17 which is transmission-connected to the main worm 11 and meshes with the worm wheel 14 is rotatably mounted on the other ends of the two connecting frames 18. A driving rod is arranged on one of the connecting frames 18, and both the main worm 11 and the secondary worm 17 are transmission-connected to the driving rod through bevel gears, so that the main worm 11 can simultaneously drive the secondary worm 17 to move together when performing axial movement, and the cooperation of the two can offset the worm wheel 14, so as to prevent the worm wheel 14 from rotating when the main worm 11 performs axial movement. A second limiting rod 16 is rotatably mounted in the housing 2, and a card foot through hole is arranged on the secondary worm 17, and the second limiting rod 16 passes through the card foot through hole and is slidably connected thereto.

[0037] Through the above technical solution, when the main worm 11 is adjusted by axial movement, it will also drive the auxiliary worm 17 to move synchronously. When the two move synchronously, they will both hold the worm wheel 14 at the same time. The advantage of this design is that it will not affect the normal transmission of the main worm 11 to the worm wheel 14, and it also solves the problem that the main worm 11 easily causes the worm wheel 14 to rotate when it moves axially.

[0038] Oil holes 19 are provided in the first foot groove, the second foot groove and the foot through-hole, so that the first foot groove, the second foot groove and the foot through-hole can accommodate more grease or allow the lubricating oil to enter the first foot groove, the second foot groove and the foot through-hole to achieve better lubrication effect, thereby reducing the wear of the adjusting rod 5, the first limiting rod 12 and the second limiting rod 16, and ensuring the stability and precision of the precision worm gear mechanism and the auxiliary worm gear 17.

[0039] The implementation principle of an ultra-precision five-axis tilt CNC indexing turntable in the embodiment of the present application is:

[0040] When the transmission cylinder 4 is driven to rotate by the motor 3, the transmission cylinder 4 synchronously drives the adjusting rod 5 to rotate, and when the adjusting rod 5 rotates, the external threaded ring 6 thereon will rotate synchronously, so that under the action of the internal threaded ring 7, the external threaded ring 6 will drive the entire adjusting rod 5 to move axially, and when the external threaded ring 6 is disengaged from the internal threaded ring 7, the axial movement of the adjusting rod 5 can be maintained, and at the same time, the normal rotation of the adjusting rod 5 will not be affected, and the adjusting rod 5 will squeeze the spring 10 on one side through the slider 8, so that the corresponding spring 10 pushes the slide cylinder 9 and the main worm 11 fixedly connected to the slide cylinder 9, so that the main worm 11 can achieve adaptive axial movement and press against the transmission teeth of the worm wheel 14, so as to ensure the precision of the transmission, and in this process, the adjusting rod 5 will also drive the main worm 11 to rotate, and the main worm 11 drives the worm wheel 14 meshing with it to rotate, and the worm wheel 14 drives the workbench 15 to rotate through the shaft 13;

[0041] At the same time, when the main worm 11 moves axially, it will synchronously drive the auxiliary worm 17 to move through the two connecting frames 18, and the main worm 11 and the auxiliary worm 17 can press against the worm wheel 14 from both the upper and lower sides, so that when the main worm 11 is adjusted in the axial direction, the worm wheel 14 will not rotate by itself to affect the accuracy, and because the main worm 11 and the auxiliary worm 17 can rotate synchronously and transmit to the worm wheel 14, the auxiliary worm 17 will not restrict the normal rotation of the worm wheel 14;

[0042] When the workbench 15 needs to rotate in the opposite direction, the motor 3 drives the adjusting rod 5 to reverse through the transmission cylinder 4. At this time, the squeezed spring 10 will apply a reverse thrust to the adjusting rod 5, so that the external threaded ring 6 is threadedly connected with the internal threaded ring 7 again during the reversal. Then the external threaded ring 6 is conveyed to the other side of the internal threaded ring 7 and separated from the internal threaded ring 7 again. At this time, the entire adjusting rod 5 drives the slide cylinder 9, the main worm 11 and the auxiliary worm 17 to move axially toward the other end through another spring 10, and then fits tightly with the other side of the transmission tooth of the worm wheel 14, so as to ensure that precise meshing can be maintained during the reversal to ensure transmission accuracy.

[0043] The above-mentioned embodiments are only preferred embodiments of the present invention and cannot be used to limit the scope of protection of the present invention. Any non-substantial changes and substitutions made by technicians in this field on the basis of the present invention shall fall within the scope of protection required by the present invention.

Claims

1. An ultra-precision five-axis tilting CNC indexing turntable, comprising a spindle box (1), a turntable drive assembly being arranged on a drive shaft of the spindle box (1), the turntable drive assembly comprising a housing (2), a shaft (13) rotatably mounted in the housing (2), a worm gear (14) sleeved on the shaft (13), and a workbench (15) arranged at the top end of the shaft (13), a precision worm mechanism for driving the worm gear (14) and a motor (3) for driving the precision worm mechanism being arranged in the housing (2), characterized in that: The precision worm mechanism comprises a main worm (11) which is rotatably mounted in the housing (2) and can move axially and mesh with the worm wheel (14); a slide cylinder (9) is provided at one end of the main worm (11); an adjusting rod (5) which can move axially is provided in the slide cylinder (9); a slider (8) is provided at one end of the adjusting rod (5) which is in the slide cylinder (9); two springs (10) are provided in the slide cylinder (9) and are located on both sides of the slider (8); an external threaded ring (6) is provided on the adjusting rod (5); an internal threaded ring (7) which is fixedly connected to the inner wall of the housing (2) is provided on the threaded sleeve of the external threaded ring (6); Thus, when the adjusting rod (5) rotates, the external threaded ring (6) thereon drives the adjusting rod (5) to move axially under the action of the internal threaded ring (7), and during the movement, the spring (10), the slide cylinder (9) and the main worm (11) are pushed by the slider (8), forcing the main worm (11) to move axially and thereby precisely mesh with the worm wheel (14); The main worm (11) is rotatably sleeved with two connecting frames (18), and the other ends of the two connecting frames (18) are rotatably mounted with auxiliary worms (17) which are transmission-connected to the main worm (11) and meshed with the worm wheel (14), so that when the main worm (11) moves axially, it can simultaneously drive the auxiliary worm (17) to move together, and the two can cooperate to offset the worm wheel (14), thereby preventing the main worm (11) from causing the worm wheel (14) to rotate when the main worm (11) moves axially.

2. The ultra-precision five-axis tilting CNC indexing turntable according to claim 1, characterized in that: A transmission cylinder (4) is rotatably mounted in the housing (2); one end of the transmission cylinder (4) is provided with a first foot slot; one end of the adjustment rod (5) extends into the first foot slot and is slidably connected to the first foot slot; the transmission cylinder (4) is transmission-connected to the motor (3), so that the adjustment rod (5) can maintain transmission connection with the motor (3) while performing axial movement.

3. The ultra-precision five-axis tilting CNC indexing turntable according to claim 1, characterized in that: A hexagonal groove is provided on the inner wall of one end of the slide cylinder (9), and a hexagonal shaft is provided on one side of the slide block (8). One end of the hexagonal shaft extends into the hexagonal groove and is slidably connected to the hexagonal groove, so that the adjustment rod (5) can not only move axially to adjust the main worm gear (11), but also drive the main worm gear (11) to rotate normally.

4. The ultra-precision five-axis tilting CNC indexing turntable according to claim 1, characterized in that: A second foot slot is provided at one end of the main worm (11), a first limiting rod (12) is slidably inserted in the second foot slot, and the other end of the first limiting rod (12) is rotatably connected to the housing (2), thereby supporting one end of the main worm (11) and ensuring that the main worm (11) can stably move or rotate axially.

5. The ultra-precision five-axis tilting CNC indexing turntable according to claim 1, characterized in that: A second limiting rod (16) is rotatably mounted in the housing (2), a foot through hole is provided on the auxiliary worm gear (17), and the second limiting rod (16) passes through the foot through hole and is slidably connected thereto.

6. The ultra-precision five-axis tilting CNC indexing turntable according to claim 1, characterized in that: Both sides of the internal thread ring (7) are concave structures, which not only ensures the compactness of the structure, but also ensures that the adjustment rod (5) will not be restricted by the internal thread ring (7) when driving the slide cylinder (9) to move.

7. The ultra-precision five-axis tilting CNC indexing turntable according to claim 5, characterized in that: The clamping foot perforations are each provided with an oil hole (19), so that the clamping foot perforations can accommodate more lubricating grease or lubricating oil can enter the clamping foot perforations to achieve a better lubricating effect, thereby reducing the wear of the second limiting rod (16).

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