A small numerical control machine tool rotary table

Abstract

The utility model discloses a kind of for small numerical control machine tool rotary table, including bottom plate, the top of bottom plate is rigidly installed with rotating shaft body and inclined shaft body respectively by bolt, the input shaft of inclined shaft body is connected with the output end of precision gear reducer assembly by spline, the output end of rotating shaft body is coaxially fixed with work disc surface;Inclined shaft body is fixedly connected with drive protective cover on one side, drive protective cover is covered with inclined shaft drive unit;The utility model passes through inclined shaft and rotating shaft respectively design the reducer of its working condition, inclined shaft adopts precision gear reducer, its high rigidity, impact resistance characteristic adapts to instantaneous high torque load under heavy load intermittent cutting working condition, effectively avoid the fatigue fracture risk of harmonic reducer flexspline due to alternating stress, improve the reliability and service life of inclined shaft;Rotating shaft adopts harmonic reducer, its zero backlash and micrometer level repeat positioning accuracy meet the demand of high-precision continuous indexing, ensure the consistency of machining profile.

Description

Technical Field

[0001] This utility model relates to the technical field of CNC machine tool rotary tables, specifically a rotary table for small CNC machine tools. Background Technology

[0002] With the widespread use of five-axis CNC machine tools in the field of precision machining, the dynamic accuracy and rigidity of the dual-axis rotary table, as a core functional component, directly affect the machining quality of complex curved surface parts.

[0003] Traditional solutions employ isomorphic reduction designs for rotary and tilting axes, such as dual harmonic reducers, ignoring the differences in working conditions between the two axes. When the tilting axis is subjected to heavy-load intermittent cutting, the flexible wheel of the harmonic reducer is prone to fatigue fracture. Meanwhile, the high-precision continuous indexing requirement of the rotary axis demands positioning repeatability that gear reducers cannot match. Furthermore, the drive unit relies solely on natural convection for heat dissipation. After several hours of continuous machining, the servo motor temperature rises, inducing thermal deformation and raising the surface temperature of the protective cover, posing a risk of burns. Utility Model Content

[0004] The purpose of this invention is to provide a rotary table for small CNC machine tools to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, the present invention provides the following technical solution: a rotary table for a small CNC machine tool, comprising a base plate, wherein a rotary shaft body and an inclined shaft body are rigidly mounted on the top of the base plate by bolts, the input shaft of the inclined shaft body is connected to the output end of a precision gear reducer assembly by a spline, and a work plate surface is coaxially fixed to the output end of the rotary shaft body.

[0006] A drive protective cover is fixedly connected to one side of the tilting shaft body. The drive protective cover covers the tilting shaft drive unit. The tilting shaft drive unit includes a tilting shaft servo motor, a first servo motor mounting flange, a precision gear reducer assembly, and a first hydraulic clamping device.

[0007] The inner wall of the drive protective cover is provided with a heat dissipation air duct parallel to the motor axis. A filter screen is provided at the air outlet of the heat dissipation air duct on the drive protective cover. The output end of the tilting axis servo motor is provided with a reverse blade, and the airflow of the reverse blade is directed towards the heat dissipation air duct.

[0008] Preferably, an oil distributor is fixed to the side of the base plate, and the oil inlet of the oil distributor is connected to an external oil pipe through a quick-connect coupling. A magnetic filter is fixedly sleeved on the external oil pipe.

[0009] Preferably, the tilting axis servo motor is coaxially connected to the input end of the precision gear reducer assembly via a first servo motor mounting flange, and the clamping block of the first hydraulic clamping device is radially embedded in the annular keyway of the output shaft of the precision gear reducer assembly.

[0010] Preferably, a tailstock body is fixedly installed on the upper end of the base plate, and the outer contour of the tailstock body is covered with a protective cover.

[0011] Preferably, one end of the tilt axis servo motor is fixedly connected to a drive wire through the drive protective cover.

[0012] Preferably, the rotating shaft body includes a rotating shaft servo motor, a second servo motor mounting flange, a harmonic reducer assembly, and a second hydraulic clamping device. The rotating shaft servo motor is coaxially connected to the input end of the harmonic reducer assembly through the second servo motor mounting flange, and the output end of the harmonic reducer assembly is connected to the input shaft of the rotating shaft body through a transition flange.

[0013] Preferably, the piston rod of the second hydraulic clamping device presses against the end face of the output flange of the harmonic reducer assembly along the axial direction.

[0014] Compared with the prior art, the beneficial effects of this utility model are:

[0015] 1. This utility model designs reducers for different working conditions for the tilting shaft and the rotating shaft. The tilting shaft adopts a precision gear reducer, whose high rigidity and impact resistance characteristics are suitable for the instantaneous high torque load under heavy-duty intermittent cutting conditions, effectively avoiding the risk of fatigue fracture of the flexible wheel of the harmonic reducer due to alternating stress, and improving the reliability and service life of the tilting shaft. The rotating shaft adopts a harmonic reducer, whose zero backlash and micron-level repeatability positioning accuracy meet the requirements of high-precision continuous indexing, ensuring the consistency of the machining contour.

[0016] 2. This utility model designs a drive protective cover with reverse blades and heat dissipation ducts. The rotation of the reverse blades forms a forced airflow that flows efficiently along the motor axis, which can quickly dissipate heat from the drive unit and effectively prevent the servo motor from deforming due to temperature rise during continuous operation, thereby ensuring processing accuracy. At the same time, the forced heat dissipation keeps the surface temperature of the drive protective cover within a safe range, eliminating the risk of burns to operators. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the structure of the rotary table of the small CNC machine tool of this utility model.

[0018] Figure 2 This is a schematic diagram of the oil circuit mechanism of this utility model.

[0019] Figure 3 This is a schematic diagram of the structure of the rotating shaft body component of this utility model.

[0020] Figure 4 This is a schematic diagram of the tilting shaft drive unit of this utility model.

[0021] Figure 5This is a schematic diagram of the structure of one end of the drive protective cover of this utility model.

[0022] In the diagram: 1. Base plate; 2. Rotary shaft body; 3. Protective cover; 4. Tailstock body; 5. Working disc; 6. Inclined shaft body; 7. Drive protective cover; 7. Heat dissipation duct; 71. Reverse blade; 72. Filter screen; 73. Oil circuit distributor; 8. Magnetic filter; 81. External oil pipe; 9. Drive wire; 10. Inclined shaft servo motor; 11. First servo motor mounting flange; 12. Precision gear reducer assembly; 13. First hydraulic clamping device; 14. Rotary shaft servo motor; 15. Second servo motor mounting flange; 16. Harmonic reducer assembly; 17. Second hydraulic clamping device; 18. Detailed Implementation

[0023] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0024] Please see Figures 1 to 5 This utility model provides a technical solution: a rotary table for a small CNC machine tool, including a base plate 1. The top of the base plate 1 is rigidly mounted with a rotary shaft body 2 and an inclined shaft body 6 by bolts. The input shaft of the inclined shaft body 6 is connected to the output end of a precision gear reducer assembly 13 via a spline. The gear reducer has high rigidity and impact resistance, and is especially suitable for the instantaneous high torque load of the inclined shaft under heavy-duty intermittent cutting conditions, avoiding the risk of fatigue fracture of the flexible wheel of the harmonic reducer due to alternating stress.

[0025] A drive protective cover 7 is fixedly connected to one side of the tilting shaft body 6. The drive protective cover 7 covers the tilting shaft drive unit. The tilting shaft drive unit includes a tilting shaft servo motor 11, a first servo motor mounting flange 12, a precision gear reducer assembly 13, and a first hydraulic clamping device 14. The tilting shaft servo motor 11 is coaxially connected to the input end of the precision gear reducer assembly 13 through the first servo motor mounting flange 12. The clamping block of the first hydraulic clamping device 14 is radially embedded in the annular keyway of the output shaft of the precision gear reducer assembly 13. Radial locking can resist the impact of cutting torque, prevent the output shaft from rotating, and enhance the stability of the tilting shaft in intermittent cutting.

[0026] The rotary shaft body 2 includes a rotary shaft servo motor 15, a second servo motor mounting flange 16, a harmonic reducer assembly 17, and a second hydraulic clamping device 18. The rotary shaft servo motor 15 is coaxially connected to the input end of the harmonic reducer assembly 17 through the second servo motor mounting flange 16.

[0027] The output end of the harmonic reducer assembly 17 is connected to the input shaft of the rotary shaft body 2 through a transition flange. The harmonic reducer has the functions of zero backlash and micron-level repeatability positioning accuracy, which meets the requirements of high-precision continuous indexing of the rotary shaft and ensures the consistency of the machining contour. The piston rod of the second hydraulic clamping device 18 presses against the end face of the output flange of the harmonic reducer assembly 17 along the axial direction. The axial preload eliminates the internal elastic deformation of the harmonic reducer and ensures high precision of indexing positioning when locked.

[0028] The output end of the rotating shaft body 2 is coaxially fixed with a working disc 5, and the upper end of the base plate 1 is fixedly installed with a tailstock body 4. The outer contour of the tailstock body 4 is covered with a protective cover 3, which isolates chips and coolant and protects the precision components of the rotating shaft.

[0029] The inner wall of the drive protective cover 7 is provided with a heat dissipation air duct 71 parallel to the motor axis. A filter screen 73 is provided at the air outlet of the heat dissipation air duct 71 on the drive protective cover 7. A reverse blade 72 is provided at the output end of the tilt axis servo motor 11. The airflow direction of the reverse blade 72 is towards the heat dissipation air duct 71. One end of the tilt axis servo motor 11 passes through the drive protective cover 7 and is fixedly connected to the drive wire 10.

[0030] The rotation of the reverse blade 72 creates a forced airflow, which flows efficiently along the motor axis, quickly dissipating heat from the drive unit and preventing the servo motor from deforming due to continuous temperature rise during operation. At the same time, it keeps the surface temperature of the drive protective cover 7 within a safe range, eliminating the risk of burns to operators.

[0031] An oil distributor 8 is fixed to the side of the base plate 1. The oil inlet of the oil distributor 8 is connected to an external oil pipe 9 through a quick-connect coupling. A magnetic filter 81 is fixedly sleeved on the external oil pipe 9. The magnetic filter 81 adsorbs ferromagnetic wear debris in the oil, preventing particles from entering the meshing area of ​​the reducer and extending the life of the gear and harmonic reducer.

[0032] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A rotary table for a small CNC machine tool, comprising a base plate (1), characterized in that: The top of the base plate (1) is rigidly mounted with a rotating shaft body (2) and an inclined shaft body (6) respectively by bolts. The input shaft of the inclined shaft body (6) is connected to the output end of the precision gear reducer assembly (13) by a spline. The output end of the rotating shaft body (2) is coaxially fixed with a working disc surface (5). A drive protective cover (7) is fixedly connected to one side of the tilting shaft body (6). The drive protective cover (7) covers the tilting shaft drive unit. The tilting shaft drive unit includes a tilting shaft servo motor (11), a first servo motor mounting flange (12), a precision gear reducer assembly (13), and a first hydraulic clamping device (14). The inner wall of the drive protective cover (7) is provided with a heat dissipation duct (71) parallel to the motor axis. A filter screen (73) is provided at the air outlet of the heat dissipation duct (71) on the drive protective cover (7). A reverse blade (72) is provided at the output end of the tilt axis servo motor (11). The air direction of the reverse blade (72) is towards the heat dissipation duct (71).

2. A rotary table for a small CNC machine tool according to claim 1, characterized in that: An oil distributor (8) is fixed on the side of the base plate (1). The oil inlet of the oil distributor (8) is connected to an external oil pipe (9) through a quick-connect coupling. A magnetic filter (81) is fixedly sleeved on the external oil pipe (9).

3. A rotary table for use in a small CNC machine tool according to claim 1, characterized in that: The tilting axis servo motor (11) is coaxially connected to the input end of the precision gear reducer assembly (13) through the first servo motor mounting flange (12), and the clamping block of the first hydraulic clamping device (14) is radially embedded in the annular keyway of the output shaft of the precision gear reducer assembly (13).

4. A rotary table for use in a small CNC machine tool according to claim 1, characterized in that: The upper end of the base plate (1) is fixedly installed with a tailstock body (4), and the outer contour of the tailstock body (4) is covered with a protective cover (3).

5. A rotary table for use in a small CNC machine tool according to claim 1, characterized in that: One end of the tilt axis servo motor (11) is fixedly connected to the drive wire (10) through the drive protective cover (7).

6. A rotary table for use in a small CNC machine tool according to claim 1, characterized in that: The rotating shaft body (2) includes a rotating shaft servo motor (15), a second servo motor mounting flange (16), a harmonic reducer assembly (17), and a second hydraulic clamping device (18). The rotating shaft servo motor (15) is coaxially connected to the input end of the harmonic reducer assembly (17) through the second servo motor mounting flange (16), and the output end of the harmonic reducer assembly (17) is connected to the input shaft of the rotating shaft body (2) through a transition flange.

7. A rotary table for a small CNC machine tool according to claim 6, characterised in that: The piston rod of the second hydraulic clamping device (18) presses against the end face of the output flange of the harmonic reducer assembly (17) along the axial direction.

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