CN212192257U

CN212192257U - Tower type machining center with high rotation precision

Info

Publication number: CN212192257U
Application number: CN202020872001.6U
Authority: CN
Inventors: 陈福祥; 云祥有; 徐伟锋
Original assignee: Shanghai Xinluo Mechanical Engineering Co ltd
Current assignee: Shanghai Xinluo Mechanical Engineering Co ltd
Priority date: 2020-05-21
Filing date: 2020-05-21
Publication date: 2020-12-22
Anticipated expiration: 2030-05-21

Abstract

The utility model relates to a machine tooling technical field discloses a tower machining center that rotation precision is high, including base storehouse seat and controller, be equipped with the cavity in the base storehouse seat, be equipped with a central section of thick bamboo in the cavity, central section of thick bamboo top is fixed with the bearing frame, rotates on the bearing frame to be connected with the revolving stage, is equipped with the left cutting arm and the right cutting arm that are used for bearing the weight of the cutter on the revolving stage, be equipped with on the bearing frame and be used for driving revolving stage pivoted slewing mechanism, be equipped with the steel bar chi of being connected with the controller electricity between bearing frame and the revolving stage in order to monitor revolving. The utility model has the advantages of it is following and effect: according to the scheme, the rotating mechanism is utilized to realize position adjustment of the left cutting arm and the right cutting arm, so that the boring and milling operation of a machining center is facilitated; and the steel grating ruler can monitor the rotating angle of the rotary table in real time, so that the controller can correct errors when the angle is deviated, the purpose of accurately controlling the rotating angle of the rotary table is achieved, and the influence on the processing precision due to low rotating precision is avoided.

Description

Tower type machining center with high rotation precision

Technical Field

The utility model relates to a machine tooling technical field, in particular to tower machining center that rotation accuracy is high.

Background

With the continuous development of industrialization, the requirement on the machining production efficiency of workpieces is higher and higher, which puts forward higher new requirements on machining equipment, and not only the machining equipment is required to have high machining precision, but also the machining equipment is required to be capable of finishing the machining of multi-station steps as soon as possible. Numerical control technology and numerical control equipment are important foundations of manufacturing industry modernization, and a numerical control machine is a typical numerical control device which utilizes the numerical control technology to improve processing precision and efficiency, and the occurrence of the numerical control machine has revolutionary influence on the traditional manufacturing industry.

The machining center is a highly automated multifunctional numerical control machine tool with a tool magazine and an automatic tool changer, and a common machining center has multiple functions of turning, milling, boring and the like, but the machining center is mainly used for machining small and medium-sized parts, is rarely used for machining large-sized parts and extra-large-sized parts, and is particularly used for machining inner walls of cylindrical and box-shaped parts. The motion of the cutter and the cutter seat on the machining center needs a driving system to realize, a power mechanism for realizing rotation is usually a motor, and a controller identifies a machining command and then controls the rotating speed or the number of turns of the motor to adjust the final rotating angle. However, the large machining center has a heavy self-weight and a large inertia, and a certain time is required for starting and stopping the rotating mechanism, so that the rotating mechanism can still rotate when the motor stops working, and the machining precision is influenced. Therefore, a tower-type machining center with high rotation accuracy is needed, which has a function of monitoring a rotation angle in real time and avoids the influence on machining accuracy due to low rotation accuracy.

SUMMERY OF THE UTILITY MODEL

Not enough to prior art exists, the utility model aims at providing a tower machining center that rotation accuracy is high has real-time supervision turned angle's function, avoids influencing the machining precision because of the rotation accuracy is low.

The above utility model discloses an above-mentioned utility model purpose can realize through following technical scheme:

the utility model provides a tower machining center that rotation accuracy is high, includes base storehouse seat and installs the controller on the base storehouse seat, the cavity has been seted up at base storehouse seat middle part, is equipped with the central section of thick bamboo of liftable in the cavity, center section of thick bamboo top is fixed with the bearing frame, it is connected with the revolving stage to rotate on the bearing frame, revolving stage bilateral symmetry is provided with the left cutting arm that is used for bearing the boring cutter and the right cutting arm that is used for bearing the milling cutter, be equipped with on the bearing frame and be used for driving revolving stage pivoted slewing mechanism, be equipped with the steel bar chi of being connected with the controller electricity between bearing frame and the revolving stage in order to monitor revolving.

By adopting the technical scheme, the base bin seat is provided with the left cutting arm and the right cutting arm to install a tool for boring and a tool for milling, and the positions of the left cutting arm and the right cutting arm are adjusted by the rotating mechanism, so that the boring and milling operations of a machining center are facilitated; and the steel grating ruler can monitor the rotating angle of the rotary table in real time, so that the controller can correct errors when the angle is deviated, the purpose of accurately controlling the rotating angle of the rotary table is achieved, and the influence on the processing precision due to low rotating precision is avoided.

The present invention may be further configured in a preferred embodiment as: the rotary table is characterized in that a rotating mechanism used for driving the rotary table to rotate is arranged on the base, the rotating mechanism comprises a rotating motor which is fixed on the edge of the lower surface of the bearing seat and electrically connected with the controller, an output shaft of the rotating motor extends upwards and penetrates through the bearing seat to be rotatably connected with the bearing seat, a driving gear is fixed at the top of the output shaft of the rotating motor, and a driven gear ring meshed with the driving gear is fixed on the lower surface of the rotary table.

Through adopting above-mentioned technical scheme, utilize to rotate motor drive driving gear and rotate to this drives driven ring gear and revolving stage and rotates, has realized the function of adjusting left cutting arm and right cutting arm, and the transmission of gear train, high-speed stable, precision is good, has reduced the influence of transmission structure to the work of cutter on left cutting arm and the right cutting arm, is favorable to ensureing the machining precision.

The present invention may be further configured in a preferred embodiment as: the bearing comprises a turntable, a bearing seat and a bearing seat, and is characterized in that a composite bearing assembly is arranged between the turntable and the bearing seat, the composite bearing assembly comprises a bearing outer ring fixed with the bearing seat and a bearing inner ring fixed with the turntable, an annular groove is formed in the bearing inner ring, the bearing outer ring is sleeved in the annular groove, and a plurality of rolling shafts are uniformly paved between the surface of the bearing outer ring and the annular groove.

Due to the fact that the equipment is large in specification and heavy in self-weight, the technical scheme is adopted, and the bearing inner ring and the bearing outer ring are combined to form the composite bearing assembly, so that the composite bearing assembly is suitable for the weight of the rotary table, and the condition that the rotation of the rotary table is influenced due to the damage of the bearing is avoided; and the friction force between the bearing inner ring and the bearing outer ring is reduced through the rolling shaft, and the energy consumption of the rotating motor is reduced.

The present invention may be further configured in a preferred embodiment as: the area of the end part of one end, connected with the rotary table, of the left cutting arm and the right cutting arm is 2-3 times that of the other end of the end part of.

Through adopting above-mentioned technical scheme, utilize the variable cross section to make left cutting arm and right cutting arm and the one end weight that the revolving stage is connected be greater than the weight of the other end to this when guaranteeing left cutting arm and right cutting arm rigidity, is close to the revolving stage center with the focus of left cutting arm and right cutting arm, thereby reduces the moment that slewing mechanism received, and then reduces slewing mechanism and produces the possibility of wearing and tearing because of the pressurized, avoids influencing the rotation precision because of slewing mechanism damages.

The present invention may be further configured in a preferred embodiment as: the lifting mechanism is arranged in the center barrel and comprises a lifting motor which is located in the center barrel and electrically connected with the controller, a lifting screw rod located in the middle of the center barrel is connected to the lifting motor in a transmission mode, the bottom of the lifting screw rod is connected with the base bin base in a rotating mode, the lifting barrel is in threaded fit with the base bin base, the top of the lifting barrel extends out of the center barrel and is fixed with a guide barrel, and a guide hole clamped with the guide barrel is formed in the center of the rotary table.

Through adopting above-mentioned technical scheme, utilize elevator motor drive lift lead screw to rotate to this drives a lift section of thick bamboo and reciprocates on lift lead screw, and then drives guide cylinder and revolving stage lift, has realized being convenient for process the regulation of left cutting arm and right cutting arm height.

The present invention may be further configured in a preferred embodiment as: the top of the lifting cylinder is fixed with a disc-shaped connecting disc, the edge of the upper surface of the connecting disc is fixed with the bottom of the guide cylinder, and the middle part of the upper surface of the connecting disc is also fixed with a cylindrical weight.

Through adopting above-mentioned technical scheme, utilize cylindricality pouring weight to be close to the revolving stage center with the focus on the whole revolving stage to further reduce the moment that slewing mechanism received.

The present invention may be further configured in a preferred embodiment as: and a damping slide block made of damping materials is fixed on the inner wall of the base bin seat, and one side of the damping slide block back to the base bin seat is tightly propped against the outer side wall of the central cylinder.

By adopting the technical scheme, the damping slide block made of damping materials is used for absorbing vibration generated in the rotating and lifting processes of the rotary table, so that the possibility that the vibration is transmitted to the cutters on the left cutting arm and the right cutting arm is reduced, and the machining precision is improved.

The present invention may be further configured in a preferred embodiment as: the lubricating oil channel is formed in the surface of one side, facing the central cylinder, of the damping slide block, the oil pipe communicated with the lubricating oil channel is arranged on the base, and the oil pipe is communicated with an oil pump used for conveying lubricating oil.

Through adopting above-mentioned technical scheme, utilize the oil pump to carry lubricating oil to the damping slider to this heat that produces when reducing the damping slider and absorbing the vibration has prolonged the life of damping slider.

To sum up, the utility model discloses a following at least one useful technological effect:

1. in the scheme, the steel grating ruler can monitor the rotating angle of the rotary table in real time, so that the controller can correct errors in the angular deviation, the aim of accurately controlling the rotating angle of the rotary table is fulfilled, and the influence on the processing precision due to low rotating precision is avoided;

2. according to the scheme, the driving gear is driven to rotate by the rotating motor, so that the driven gear ring and the rotary table are driven to rotate, the function of adjusting the left cutting arm and the right cutting arm is realized, the transmission of the gear train is high-speed and stable, the precision is good, the influence of a transmission structure on the work of cutters on the left cutting arm and the right cutting arm is reduced, and the machining precision is favorably ensured;

3. this scheme utilization variable cross section makes left cutting arm and right cutting arm and the one end weight that the revolving stage is connected be greater than the weight of the other end to this when guaranteeing left cutting arm and right cutting arm rigidity, is close to the revolving stage center with the focus of left cutting arm and right cutting arm, thereby reduces the moment that slewing mechanism received, and then reduces slewing mechanism and produces the possibility of wearing and tearing because of the pressurized, avoids damaging because of slewing mechanism and influences the rotation essence.

Drawings

Fig. 1 is a schematic structural diagram of the present invention;

FIG. 2 is an exploded view of the structure on the left cutting arm of the present invention;

fig. 3 is an exploded view of the structure of the middle base chamber seat of the present invention.

Reference numerals: 1. a base bin seat; 11. a central barrel; 111. a load-bearing hydraulic cylinder; 12. a bearing seat; 2. a turntable; 21. a guide hole; 22. a fabrication hole; 23. a top cover; 3. a left cutting arm; 31. a lower base; 32. an upper base; 33. an X-direction driving mechanism; 331. a first drive motor; 332. a screw rod in the X direction; 333. a first moving block; 34. a Y-direction driving mechanism; 341. a second drive motor; 342. a Y-direction lead screw; 343. a second moving block; 35. a tool holder; 4. a right cutting arm; 51. rotating the motor; 52. a driving gear; 53. a driven gear ring; 54. a composite bearing assembly; 541. a bearing outer race; 542. a roller; 543. a bearing inner race; 544. an annular groove; 61. a lifting motor; 62. lifting a screw rod; 63. a transmission case; 64. a lifting cylinder; 65. a connecting disc; 66. a guide cylinder; 67. a columnar weight; 68. a load-bearing hydraulic cylinder; 69. a vertical slide rail; 691. a vertical slide block; 7. a damping slider; 71. a lubricating oil passage; 72. an oil pipe; 8. a special-shaped box.

Detailed Description

The present invention will be described in further detail with reference to the accompanying drawings.

As shown in fig. 1, a tower-type machining center with high rotation precision disclosed by the present invention comprises a base 1, a turntable 2 and a controller (not shown); the base bin seat 1 is in a tower shape, a cavity is reserved in the hollow base bin seat, a central cylinder 11 is arranged in the cavity, the cross section of the central cylinder 11 is in a regular octagon shape, the central cylinder is hollow, and a circular opening is formed in the top of the central cylinder. The top of the central cylinder 11 is provided with a bearing seat 12, the bearing seat 12 is in a circular disc structure, and the rotary table 2 is rotatably installed on the bearing seat 12. The cross section of the rotary table 2 is annular, two symmetrical cross sections are arranged on the periphery of the rotary table, a left cutting arm 3 and a right cutting arm 4 are respectively fixed on the two cross sections, and cutters for processing are respectively arranged on the left cutting arm 3 and the right cutting arm 4; the controller is used as a central processing unit of the machining center and is used for identifying operation commands written by operators and controlling the cutter to machine the workpiece.

As shown in fig. 1 and 2, the left cutting arm 3 is provided with a lower base 31 and an upper base 32, the bottom of the upper base 32 is fixed to the lower base 31, and the upper base 32 is provided with a tool seat 35 for accommodating a tool. The inner parts of the left cutting arm 3 and the right cutting arm 4 are hollow box-type structures, the area of one end part of the left cutting arm 3 and the right cutting arm 4 connected with the rotary table 2 is 2-3 times of that of the other end, and the side walls of the left cutting arm 3 and the right cutting arm 4 are variable sections. A plurality of special-shaped boxes 8 used for supporting are fixed in the left cutting arm 3 and the right cutting arm 4, and a plurality of lightening holes are formed in the special-shaped boxes 8.

The left cutting arm 3 is provided with a sliding groove for the lower base 31 to slide and an X-direction sliding mechanism for driving the lower base 31 to slide, and the X-direction sliding mechanism comprises a first driving motor 331, an X-direction lead screw 332 and a first moving block 333. The first driving motor 331 is fixed at one end of the chute formed by the left cutting arm 3, which is close to the rotary table 2, an output shaft of the first driving motor 331 extends to the other end of the chute, an X-direction lead screw 332 is fixed on the output shaft of the first driving motor 331, and the other end of the X-direction lead screw 332 is rotatably connected with the other end of the chute. When the first driving motor 331 rotates, the X-direction lead screw 332 is driven to rotate, so as to drive the first moving block 333 to move along the X-direction lead screw 332, thereby realizing the X-direction sliding of the lower base 31 and the upper tool seat 35, and facilitating the adjustment of the X-direction position of the tool. The upper base 32 is provided with a sliding groove for sliding the tool holder 35 and a Y-direction driving mechanism 34 for driving the tool holder 35 to slide, and the Y-direction driving mechanism 34 includes a second driving motor 341, a Y-direction lead screw 342 and a second moving block 343. The second driving motor 341 is fixed at one end of the chute formed in the upper base 32, an output shaft of the second driving motor 341 extends to the other end of the chute, a Y-direction lead screw 342 is fixed on the output shaft of the second driving motor 341, and the other end of the Y-direction lead screw 342 is rotatably connected with the other end of the chute. When the second driving motor 341 rotates, the Y-direction lead screw 342 is driven to rotate, so as to drive the second moving block 343 to move along the Y-direction lead screw 342, thereby realizing Y-direction sliding of the tool holder 35, and facilitating adjustment of the Y-direction position of the tool.

As shown in fig. 1, the base cartridge 1 is provided with a rotating mechanism, and the rotating mechanism includes a rotating motor 51, a driving gear 52, a driven ring gear 53, and a compound bearing assembly 54. In this embodiment, there are two rotating motors 51, the two rotating motors 51 are both fixed on the edge of the lower surface of the bearing seat 12 and electrically connected to the controller, the output shaft of the rotating motor 51 extends upward and penetrates through the bearing seat 12, the output shaft of the rotating motor 51 is rotatably connected to the bearing seat 12, and the driving gear 52 is fixed on the output shaft of the rotating motor 51. The driven gear ring 53 is circular, teeth are arranged on the outer side wall of the driven gear ring, the driven gear ring is fixed on the lower surface of the rotary table 2 through bolts, and the driven gear ring 53 is meshed with the two driving gears 52. When the rotating motor 51 is started, the driving gear 52 is driven to rotate, so that the driven gear ring 53 and the rotary table 2 are driven to rotate, and the function of adjusting the left cutting arm 3 and the right cutting arm 4 is realized.

The compound bearing assembly 54 includes a bearing outer race 541, a bearing inner race 543, and a roller 542. The bearing inner ring 543 and the bearing outer ring 541 are both circular rings, and an annular groove is formed around the bearing inner ring 543 for the bearing outer ring 541 to fit. The plurality of rollers 542 is provided, and the plurality of rollers 542 are uniformly laid between the surface of the bearing outer ring 541 and the annular groove 544. The bearing outer ring 541 is fixed on the upper surface of the bearing seat 12 through a hexagon bolt, the bearing inner ring 543 is fixed on the lower surface of the rotary table 2 through a hexagon bolt, and a plurality of threaded holes are distributed on the bearing inner ring 543 and the bearing outer ring 541 in a surrounding mode so that the inner hexagon bolt can penetrate through the threaded holes.

The lower surface of the bearing outer ring 541 is fixed with a steel grid ruler, in this embodiment, the steel grid ruler is a circular steel grid ruler produced by germany AMO corporation, and the steel grid ruler is electrically connected with the controller and is used for monitoring the rotation angle of the turntable 2 in real time and transmitting a signal to the controller, so that the controller can execute a processing command conveniently, and the purpose of accurately controlling the rotation angle of the turntable 2 is achieved.

As shown in fig. 1, a circular guide hole 21 is formed in the middle of the turntable 2, a guide cylinder 66 is arranged at an opening in the middle of the bearing seat 12, the guide cylinder 66 is cylindrical, and the outer side wall of the guide cylinder 66 is tightly connected with the inner side wall of the guide hole 21 through a key. The top edge of the guide cylinder 66 is also provided with a conical surface to facilitate the installation of the guide cylinder 66 with the guide hole 21. Referring to fig. 3, the guide cylinder 66 is a part of the lifting mechanism, and the lifting mechanism further includes a lifting motor 61, a lifting screw 62, a transmission case 63, and a lifting cylinder 64. The lifting motor 61 is positioned in the base cabin base 1 and is electrically connected with the controller, the transmission box 63 is positioned at the lower side of the lifting motor 61, and the output shaft of the lifting motor 61 extends downwards into the transmission box 63. The bottom of the lifting screw 62 also extends into the transmission case 63, and the transmission case 63 is internally provided with a gear transmission assembly, so that the transmission connection between the lifting motor 61 and the lifting screw 62 is realized, and the purposes of speed reduction and transmission are achieved. The lifting cylinder 64 is cylindrical, is sleeved on the top of the lifting screw 62 and is in threaded fit with the lifting screw 62; the top of the lifting cylinder 64 is provided with a circular connecting disc 65, the middle part of the connecting disc 65 is fixed with the top of the lifting cylinder 64, and the edge of the upper surface of the connecting disc 65 is fixed with the bottom of the guide cylinder 66. When the lifting motor 61 is started, the lifting screw 62 is driven to rotate, so that the lifting cylinder 64 is driven to move up and down on the lifting screw 62, the guide cylinder 66 and the rotary table 2 are driven to lift, the height of the left cutting arm 3 and the height of the right cutting arm 4 are adjusted, and the boring and milling processing is facilitated.

As shown in fig. 1 and 3, a cylindrical weight 67 is further fixed to a middle portion of the upper surface of the connecting plate 65, and the cylindrical weight 67 is cylindrical and made of lead and is used for approaching the center of gravity of the entire turntable 2 to the center of the turntable 2, so that the moment applied to the rotating mechanism is further reduced. The turntable 2 is further provided with a top cover 23, the top cover 23 is cylindrical, one end of an opening of the top cover 23 is clamped with the top of the guide hole 21, an annular flange is integrally formed on the outer side wall of the top cover 23, and the flange covers a gap between the top cover 23 and the guide hole 21, so that the isolation and protection effects are achieved.

Two bearing hydraulic cylinders 68111 are further arranged in the base cabin base 1, the bottoms of the two bearing hydraulic cylinders 68111 are fixed to the inner bottom surface of the base cabin base 1, and the tops of the two bearing hydraulic cylinders 68111 abut against the inner top surface of the central cylinder 11 and are used for balancing the weight of the rotary table 2 and the central cylinder 11, and damage caused by over-large pressure of the lifting mechanism is avoided. Lightening holes are formed in the rotary table 2, the base bin seat 1 and the central cylinder 11 to reduce the load of the bearing hydraulic cylinder 68111.

Still be equipped with two vertical slide rails 69 on the lateral wall of a center section of thick bamboo 11, vertical slide rail 69 top and bearing frame 12 lower surface are fixed, and the side slides with a 11 lateral wall of a center section of thick bamboo and is connected, and each vertical slide rail 69 slides on the cooperation and has two vertical slider 691, and vertical slider 691 passes through flange joint with base storehouse seat 1 the one side of a back of a center section of thick bamboo 11.

The implementation principle of the embodiment is as follows: when the workpiece needs to be machined, an operator only needs to write the machining process into a program language and input the program language into the controller, and the controller controls the rotation mechanism and the lifting mechanism to operate and controls the movement of the cutters on the left cutting arm 3 and the right cutting arm 4 so as to machine the workpiece. Above-mentioned in-process, 2 pivoted angles of revolving stage can real-time supervision to the steel grating chi to this controller carries out the error correction when angular deviation, reaches 2 turned angle's of accurate control revolving stage purpose, avoids influencing the machining precision because of the rotational precision is low.

The embodiment of this specific implementation mode is the preferred embodiment of the present invention, not limit according to this the utility model discloses a protection scope, so: all equivalent changes made according to the structure, shape and principle of the utility model are covered within the protection scope of the utility model.

Claims

1. The utility model provides a tower machining center that rotation accuracy is high, includes base storehouse seat (1) and installs the controller on base storehouse seat (1), its characterized in that, the cavity has been seted up at base storehouse seat (1) middle part, is equipped with liftable center section of thick bamboo (11) in the cavity, center section of thick bamboo (11) top is fixed with bearing frame (12), it is connected with revolving stage (2) to rotate on bearing frame (12), revolving stage (2) bilateral symmetry is provided with left cutting arm (3) that are used for bearing the boring cutter and right cutting arm (4) that are used for bearing the milling cutter, be equipped with on bearing frame (12) and be used for driving revolving stage (2) pivoted slewing mechanism, be equipped with the steel bar chi of being connected with the controller electricity between bearing frame (12) and revolving stage (2) in order to monitor revolving stage (2) pivoted angle.

2. The tower type machining center with high rotation precision according to claim 1, wherein a rotating mechanism for driving the rotary table (2) to rotate is arranged on the base (1), the rotating mechanism comprises a rotating motor (51) which is fixed on the edge of the lower surface of the bearing seat (12) and electrically connected with the controller, an output shaft of the rotating motor (51) extends upwards and penetrates through the bearing seat (12) to be connected with the bearing seat in a rotating mode, a driving gear (52) is fixed to the top of the output shaft of the rotating motor (51), and a driven gear ring (53) meshed with the driving gear (52) is fixed to the lower surface of the rotary table (2).

3. The tower-type machining center with high rotation precision according to claim 1, wherein a composite bearing assembly (54) is arranged between the rotary table (2) and the bearing seat (12), the composite bearing assembly (54) comprises a bearing outer ring (541) fixed with the bearing seat (12) and a bearing inner ring (543) fixed with the rotary table (2), an annular groove (544) is formed in the bearing inner ring (543), the bearing outer ring (541) is sleeved in the annular groove (544), and a plurality of rolling shafts (542) are uniformly paved between the surface of the bearing outer ring (541) and the annular groove (544).

4. The tower-type machining center with high rotation precision according to claim 1, wherein the area of one end part of the left cutting arm (3) and the right cutting arm (4) connected with the rotary table (2) is 2-3 times of the area of the other end part, and the side walls of the left cutting arm (3) and the right cutting arm (4) are of variable cross sections.

5. The tower machining center with high rotation precision according to claim 1, wherein a lifting mechanism is arranged in the center barrel (11), the lifting mechanism comprises a lifting motor (61) which is arranged in the center barrel (11) and electrically connected with the controller, a lifting lead screw (62) which is arranged in the middle of the center barrel (11) is in transmission connection with the lifting motor (61), the bottom of the lifting lead screw (62) is rotatably connected with the base bin seat (1) and is in threaded fit with the lifting barrel (64), the top of the lifting barrel (64) extends out of the center barrel (11) and is fixed with a guide barrel (66), and a guide hole (21) which is tightly clamped with the guide barrel (66) is formed in the center of the rotary table (2).

6. The tower-type machining center with high rotation precision as claimed in claim 5, wherein a disc-shaped connecting disc (65) is fixed to the top of the lifting cylinder (64), the edge of the upper surface of the connecting disc (65) is fixed to the bottom of the guide cylinder (66), and a cylindrical weight (67) is further fixed to the middle of the upper surface of the connecting disc (65).

7. The tower machining center with high rotation precision according to claim 1, wherein a damping slide block (7) made of damping material is fixed on the inner wall of the base bin seat (1), and one side of the damping slide block (7) back to the base bin seat (1) is abutted against the outer side wall of the central cylinder (11).

8. The tower-type machining center with high rotation precision according to claim 7, wherein a lubricating oil channel (71) is formed in the surface of one side, facing the center barrel (11), of the damping slide block (7), an oil pipe (72) communicated with the lubricating oil channel (71) is arranged on the base bin seat (1), and an oil pump used for conveying lubricating oil is communicated with the oil pipe (72).