CN215091950U

CN215091950U - Ultra-precise turning and milling composite numerical control machine tool

Info

Publication number: CN215091950U
Application number: CN202120312543.2U
Authority: CN
Inventors: 杨朝鹏
Original assignee: Changzhou Maina Photoelectric Technology Co ltd
Current assignee: Changzhou Maina Photoelectric Technology Co ltd
Priority date: 2021-02-03
Filing date: 2021-02-03
Publication date: 2021-12-10
Anticipated expiration: 2031-02-03

Abstract

The utility model relates to a compound digit control machine tool of ultra-precise turn-milling, including the lathe bed, be equipped with the main shaft system that is used for the clamping work piece on the lathe bed, still be equipped with knife rest and drive knife rest on the lathe bed along the drive arrangement of X direction and Z direction displacement, be equipped with thick milling cutter, finish milling cutter, rough turning tool and finish turning tool along knife rest length direction on the knife rest in proper order, be equipped with drive thick milling cutter, finish milling cutter, rough turning tool and finish turning tool pivoted power device on the knife rest. By arranging the rough milling cutter, the finish milling cutter, the rough turning tool and the finish turning tool on the lathe bed simultaneously, the workpiece can be milled and turned only by one-time clamping, and the machining efficiency and the machining precision are improved.

Description

Ultra-precise turning and milling composite numerical control machine tool

Technical Field

The application relates to the field of machining, in particular to an ultra-precise turning and milling composite numerical control machine tool.

Background

With the development of science and technology, laser technology is applied more and more widely in various industries. In a laser level for building, there is a super-precise part called a reflecting cone, which is an aluminum 90-degree conical surface, the conical surface is an optical mirror surface, and the axis is perpendicular to the horizontal plane. The precision requirement of the reflecting surface is very high, the error of the 90-degree angle is within 5 seconds, the surface roughness is within 8 nanometers, and the processing requirement of the reflecting cone cannot be realized by conventional precision processing.

The utility model with the bulletin number of CN203030900U provides an ultra-precise diamond cone numerical control lathe, which comprises a spindle system, an X-direction moving system, a Z-direction moving system and a tool rest which are arranged on a lathe bed. The axes of the X-direction moving system and the Z-direction moving system are mutually vertical and fixed on the tool rest base, and the axis of the X-direction moving system and the axis of the main shaft form an included angle of 45 degrees.

In view of the above-mentioned related technologies, the inventor believes that there is a defect that the prior art numerically controlled machine tool can only perform turning on a workpiece, and has a single function and cannot adapt to machining of different processes of the same part.

SUMMERY OF THE UTILITY MODEL

In order to solve the technical problem of current numerical control lathe function singleness, this application provides a compound digit control machine tool of ultra-precision turn-milling.

The application provides a pair of compound digit control machine tool of ultra-precision turn-milling adopts following technical scheme: the utility model provides a compound digit control machine tool of ultra-precise turn-milling, includes the lathe bed, be equipped with the main shaft system that is used for the clamping work piece on the lathe bed, still be equipped with the drive arrangement of knife rest and driving knife rest along X direction and Z direction displacement on the lathe bed, be equipped with thick milling cutter, smart milling cutter, thick lathe tool and smart lathe tool along knife rest length direction on the knife rest in proper order, be equipped with the thick milling cutter of drive, smart milling cutter pivoted power device on the knife rest.

By adopting the technical scheme, during processing, the power device drives the coarse milling cutter and the fine milling cutter to rotate, the driving device drives the cutter frame to move in the X direction and the Z direction, and the coarse milling cutter and the fine milling cutter can mill a workpiece clamped on the main shaft system; meanwhile, the turning tool arranged on the tool rest can still perform turning operation on the workpiece, and once clamping can be performed, so that the workpiece can be milled and turned, and the machining efficiency and the machining precision are improved.

Preferably, the spindle system comprises a first aerostatic spindle fixedly arranged on the machine tool body, the first aerostatic spindle has an indexing function, and a clamp used for clamping a workpiece is arranged on the first aerostatic spindle.

Through adopting above-mentioned technical scheme, add man-hour, with the work piece centre gripping on anchor clamps, choose for use first aerostatic pressure main shaft to realize that anchor clamps are connected with the rotation of workstation, can furthest ensure the rotatory in-process rotation precision of anchor clamps to first aerostatic pressure main shaft has the graduation function, can adjust the angle of work piece relative each cutter when adding man-hour like this, improves machining efficiency.

Preferably, an ultra-precise rotary table is arranged on the lathe bed, the ultra-precise rotary table is horizontally and rotatably arranged on the lathe bed, and the first aerostatic spindle is arranged on the ultra-precise rotary table.

Through adopting above-mentioned technical scheme, through setting up ultra-precision revolving stage, can realize the regulation of the angle of first air static pressure main shaft relative knife rest to realize the control of the cutting surface angle on the work piece, further improve the processing function.

Preferably, the power device comprises a second aerostatic spindle which is arranged corresponding to the rough milling cutter and the finish milling cutter, and the second aerostatic spindle is fixedly connected with the tool rest.

Through adopting above-mentioned technical scheme, adopt the second aerostatic press main shaft to realize that rough milling cutter and finish milling cutter are connected with the rotation of knife rest, because the rotational accuracy of second aerostatic press main shaft is high, rough milling cutter and finish milling cutter are very stable at rotatory in-process, can ensure the cutting progress of rough milling cutter and finish milling cutter in the course of working.

Preferably, the driving device comprises a sliding seat arranged on the machine body in a sliding manner along the X direction, and a first driving piece for driving the sliding seat to slide along the X direction is arranged on the machine body; the tool rest slides along the Z direction and is arranged on the sliding seat, and a second driving piece for driving the tool rest to slide along the Z direction is arranged on the sliding seat.

Through adopting above-mentioned technical scheme, through setting up first driving piece and second driving piece, can drive the cutter frame and slide in X direction or Z direction to realize the turning and the milling operation of work piece.

Preferably, the first driving part comprises a first servo motor, a first lead screw is rotatably connected to the lathe bed, the first lead screw is in threaded connection with the sliding seat, and an output shaft of the first servo motor is connected with the first lead screw; the second driving part comprises a second servo motor, a second lead screw is rotatably connected to the sliding seat, the second lead screw is in threaded connection with the tool rest, and an output shaft of the second servo motor is connected with the second lead screw.

Through adopting above-mentioned technical scheme, adopt first servo motor and second servo motor drive knife rest to slide, simple structure, drive accuracy is high.

Preferably, the rough milling cutter, the finish milling cutter, the rough turning tool and the finish turning tool sequentially extend out of the tool rest in a stepped manner along the length direction of the tool rest.

By adopting the technical scheme, when the cutter frame is processed, the cutter frame only needs to always slide towards the positive direction or the negative direction in the Z direction, and the shaking of the cutter frame in the moving process is small and more stable.

Preferably, threaded connection has the connecting block on the second lead screw, it is equipped with the fixed pin to slide along perpendicular to second lead screw length direction on the connecting block, be equipped with the elastic component that the drive fixed pin slided towards the knife rest on the connecting block, be equipped with on the knife rest with fixed pin complex fixed orifices, be equipped with the driving medium that is used for driving the fixed pin roll-off fixed orifices on the knife rest.

By adopting the technical scheme, when the connecting block and the tool rest are required to be fixed, the connecting block slides to the position below the fixing hole, and the fixing pin is inserted into the fixing hole under the driving of the elastic piece, so that the fixing of the connecting block and the tool rest is realized; when wanting to remove the fixed of connecting block and knife rest, through the driving medium with the fixed pin from the downthehole roll-off of fixed, can freely remove the knife rest this moment, conveniently clear up the region between knife rest and the slide.

Preferably, be equipped with the mounting hole on the connecting block, the square post of fixedly connected with in the mounting hole, be equipped with on the fixed pin with square post complex quad slit, the elastic component is including setting up the spring in quad slit, spring one end is fixed with square top of the post portion, and the other end is fixed with the quad slit.

Through adopting above-mentioned technical scheme, through setting up quad slit and square post, the fixed pin only can slide in the mounting hole, and unable rotation has effectively improved the fixed effect between spring and the fixed pin like this.

Preferably, the driving piece sets up the gear on the connecting block including rotating, the gear cover is established outside the fixed pin, be equipped with on the gear with fixed pin complex slide opening, be equipped with the helicla flute on the inner wall of slide opening, be equipped with the slider on the fixed pin, the slider slides and sets up in the helicla flute.

Through adopting above-mentioned technical scheme, during the operation, only need drive the rack and slide, drive gear revolve, under the drive of slider and helicla flute, can drive the fixed pin and stretch out and retract in the mounting hole to realize the locking and the unblock of connecting block and knife rest.

In summary, the present application includes at least one of the following beneficial technical effects:

1. by arranging the rough milling cutter and the finish milling cutter on the tool rest, after the turning operation is finished on the workpiece, the milling operation can be simultaneously carried out, and the ultra-precision machining of the circumference and the plane can be carried out on the workpiece;

2. because knife rest and connecting block can separate, the rack slides, can separate knife rest and slide, and it is convenient to maintain.

Drawings

Fig. 1 is a first schematic structural diagram of an embodiment of the present application.

FIG. 2 is a schematic view of a tool holder junction installation of an embodiment of the present application.

Fig. 3 is a schematic overall structure diagram of the embodiment of the present application.

FIG. 4 is a schematic illustration of a tooth-fixing pin installation of an embodiment of the present application.

FIG. 5 is a cross-sectional view of the tool holder and attachment block assembly of an embodiment of the present application.

Fig. 6 is an enlarged view of a portion a in fig. 5.

Description of reference numerals: 1. a bed body; 11. an ultra-precise turntable; 2. a spindle system; 21. a first aerostatic spindle; 22. a clamp; 3. a drive device; 31. a slide base; 32. a first servo motor; 321. a first lead screw; 33. a second servo motor; 331. a second lead screw; 34. an aerostatic guideway; 4. a tool holder; 41. roughly turning a tool; 42. finishing the tool; 43. a rough milling cutter; 44. finish milling cutter; 45. a fixing hole; 5. a second aerostatic spindle; 51. a drive motor; 6. connecting blocks; 61. mounting holes; 611. a square column; 62. a fixing pin; 621. a square hole; 622. a slider; 63. a spring; 64. mounting grooves; 7. a gear; 71. a slide hole; 711. a helical groove; 8. a rack.

Detailed Description

The present application is described in further detail below with reference to figures 1-6.

The embodiment of the application discloses a composite numerical control machine tool for ultra-precise turning and milling. Referring to fig. 1, the ultra-precise turning and milling composite numerical control machine tool comprises a tool body 1, a spindle system 2 for clamping a workpiece is arranged on the tool body 1, a tool rest 4 and a driving device 3 for driving the tool rest 4 to move along the X direction and the Z direction are arranged on one side of the spindle system 2 on the tool body 1, a rough milling cutter 43, a finish milling cutter 44, a rough turning tool 41 and a finish turning tool 42 are sequentially arranged on the tool rest 4 along the length direction of the tool rest 4, the rough milling cutter 43, the finish milling cutter 44, the rough turning tool 41 and the finish turning tool 42 are all arranged on one side, close to the spindle system 2, of the tool rest 4, the rough milling cutter 43 and the finish milling cutter 44 are rotatably arranged on the tool rest 4, rotating shafts of the rough milling cutter 43 and the finish milling cutter 44 are parallel to the rough turning tool 41 and the finish turning tool 42, and a power device for driving the rough milling cutter 43 and the finish milling cutter 44 to rotate is arranged on the tool rest 4.

During machining, the power device drives the rough milling cutter 43 and the finish milling cutter 44 to rotate, the driving device 3 drives the tool rest 4 to move in the X direction and the Z direction, and the rough milling cutter 43 and the finish milling cutter 44 can mill a workpiece clamped on the spindle system 2; meanwhile, the turning tool arranged on the tool rest 4 can still perform turning operation on the workpiece, and once clamping can be performed, so that the workpiece can be milled and turned, and the machining efficiency and the machining precision are improved.

Referring to fig. 1, an ultra-precise rotary table 11 is rotatably connected to a bed 1, the ultra-precise rotary table 11 is horizontally and rotatably arranged on the bed 1, the ultra-precise rotary table 11 can be driven by a servo motor or a direct drive motor, and the angular precision is controlled by a coding region; also can adopt multiple tooth graduated disk control angle precision, the precision high control is convenient, and ultra-precision revolving stage 11 sets up in knife rest 4 side, and in this implementation, oil static pressure revolving stage or air static pressure revolving stage are chooseed for use to ultra-precision revolving stage 11, and the precision high control is convenient. The spindle system 2 comprises a first aerostatic spindle 21 fixedly arranged on the ultra-precise rotary table 11, the first aerostatic spindle 21 is horizontally arranged, a clamp 22 used for clamping a workpiece is arranged at the front end of the first aerostatic spindle 21, the clamp 22 is a spring 63 clamp 22, a direct-current brushless motor is arranged on the first aerostatic spindle 21, the direct-current brushless motor and a shaft are integrally installed, the first aerostatic spindle 21 can have an indexing function by being matched with an encoder, angles of the workpiece relative to various cutters can be adjusted during machining, and machining efficiency is improved.

Referring to fig. 1, the first aerostatic spindle 21 is provided on the ultra-precise turntable 11, and by providing the ultra-precise turntable 11, the angle of the first aerostatic spindle 21 with respect to the tool rest 4 can be adjusted, so that the angle of the cutting surface on the workpiece can be controlled, and the machining function can be further improved. During machining, a workpiece is clamped on the clamp 22, and the first air static pressure main shaft 21 and the ultra-precision rotary table 11 are matched, so that the workpiece can be displaced in the horizontal and circumferential directions, and the workpiece can be machined by each cutter conveniently.

Referring to fig. 2, in order to conveniently drive the finish milling cutter 44 and the rough milling cutter 43 to rotate, the power device includes a second aerostatic spindle 5 corresponding to the rough milling cutter 43 and the finish milling cutter 44, the second aerostatic spindle 5 is parallel to the rough turning tool 41 and the finish turning tool 42, the second aerostatic spindle 5 is fixedly connected with the tool rest 4, the rough milling cutter 43 and the finish milling cutter 44 are respectively fixed at the front sections corresponding to the second aerostatic spindle 5, and the second aerostatic spindle 5 is further connected with a driving motor 51 for driving the second aerostatic spindle 5 to rotate.

When the milling machine works, the driving motor 51 is started, and the driving motor 51 can drive the corresponding rough milling cutter 43 or the finish milling cutter 44 to rotate, so that the milling of a workpiece is realized, the second aerostatic spindle 5 is used as a transmission part, the rotation precision of the second aerostatic spindle 5 is high, the axial run-out and the radial run-out are small, and the transmission process is stable.

Referring to fig. 3, in order to stably realize the driving of the tool post 4, the driving device 3 includes a sliding seat 31 slidably disposed on the bed 1 along the X direction of the bed 1, the sliding seat 31 is slidably connected with the bed 1 through an oil hydrostatic guide or an air hydrostatic guide, and a first driving member for driving the sliding seat 31 to slide along the X direction is disposed on the bed 1; the tool rest 4 is slidably arranged on the sliding base 31 along the Z direction, and a second driving piece for driving the tool rest 4 to slide along the Z direction is arranged on the sliding base 31. By arranging the first driving part and the second driving part, the tool rest 4 can be driven to slide in the X direction or the Z direction, so that the turning and milling operations of the workpiece are realized.

In this embodiment, the first driving member includes a first servo motor 32, the first servo motor 32 is fixed on the bed 1, a first lead screw 321 is rotatably connected to the bed 1, the first lead screw 321 is disposed along the X direction of the bed 1, the first lead screw 321 is in threaded connection with the sliding base 31, the sliding base 31 can be driven to slide back and forth along the X direction of the bed 1 under the driving of the first servo motor 32 and the first lead screw 321, aerostatic guideways 34 or hydrostatic guideways are fixedly connected to two sides of the first lead screw 321 on the bed 1, the sliding base 31 is connected with the bed 1 through the aerostatic guideways 34 or hydrostatic guideways, and the aerostatic guideways 34 or hydrostatic guideways have high transmission precision and smooth transmission.

In addition, the first driving member may also be a linear motor, and the linear motor drives the oil hydrostatic rail or the air hydrostatic rail to slide, so as to realize the sliding and driving of the sliding seat 31.

Referring to fig. 3, the second driving member includes a second servo motor 33, the second servo motor 33 is fixed on the slide carriage 31, a second lead screw 331 is rotatably connected to the slide carriage 31, the second lead screw 331 is disposed along the Z direction of the machine tool body 1, the second lead screw 331 is in threaded connection with the tool holder, the tool post 4 can be driven to slide back and forth along the Z direction of the machine tool body 1 under the driving of the second servo motor 33 and the second lead screw 331, an aerostatic guideway 34 or an oleostatic guideway is fixedly connected to both sides of the second lead screw 331 on the slide carriage 31, and the tool post 4 is connected with the slide carriage 31 in a sliding manner through the aerostatic guideway 34 or the oleostatic guideway, so as to ensure the accuracy of the rough milling cutter 43, the finish milling cutter 44, the rough milling cutter 41, and the finish milling cutter 42 in the moving process.

Referring to fig. 3, in order to facilitate the movement of the rough milling cutter 43, the finish milling cutter 44, the rough turning cutter 41 and the finish turning cutter 42 during the machining, the rough milling cutter 43, the finish milling cutter 44, the rough turning cutter 41 and the finish turning cutter 42 sequentially extend out of the tool rest 4 in a stepped shape along the length direction of the tool rest 4, during the machining, the tool rest 4 only needs to always slide towards the positive direction or the negative direction in the Z direction, and the tool rest 4 has small jitter and is more stable during the movement.

Referring to fig. 3 and 4, since scraps are often generated during the cutting process, after a long production time, a certain amount of scraps may be present in the area between the slide 31 and the tool holder 4, in order to facilitate the movement of the tool holder 4 during maintenance. Threaded connection has connecting block 6 on second lead screw 331, the top surface of connecting block 6 and the laminating of the bottom surface of knife rest 4, be equipped with mounting hole 61 on connecting block 6, the opening of mounting hole 61 sets up towards knife rest 4, the length direction of mounting hole 61 perpendicular to second lead screw 331, it is connected with fixed pin 62 to slide in mounting hole 61, be equipped with the elastic component that drive fixed pin 62 slided towards knife rest 4 in mounting hole 61, in addition, be equipped with on knife rest 4 with fixed pin 62 complex fixed orifices 45, be equipped with the driving medium that is used for driving fixed pin 62 roll-off fixed orifices 45 on knife rest 4.

Referring to fig. 4 and 5, when the connecting block 6 and the tool holder 4 are fixed, the connecting block 6 is slid to be below the fixing hole 45, and the fixing pin 62 is inserted into the fixing hole 45 under the driving of the elastic member, so that the connecting block 6 and the tool holder 4 are fixed; when the fixing between the connecting block 6 and the tool rest 4 is to be released, the fixing pin 62 is slid out of the fixing hole 45 by a transmission member, and at this time, the tool rest 4 can be freely moved, so that the area between the tool rest 4 and the sliding seat 31 can be conveniently cleaned.

Referring to fig. 5 and 6, in order to facilitate the sliding of the driving fixing pin 62, a square column 611 is fixedly connected in the mounting hole 61, the square column 611 is coaxially disposed with the mounting hole 61, the square column 611 is disposed at the center of the mounting hole 61 and is fixedly connected with the bottom surface of the mounting hole 61, a square hole 621 matched with the square column 611 is disposed at the bottom of the fixing pin 62, the elastic member includes a spring 63 disposed in the square hole 621, one end of the spring 63 is fixed to the top of the square column 611, and the other end of the spring 63 is fixed to the square hole 621. Through setting up quad slit 621 and square post 611, fixed pin 62 only can slide in mounting hole 61, and unable rotation has effectively improved the fixed effect between spring 63 and the fixed pin 62 like this.

Referring to fig. 5 and 6, the transmission member includes a gear 7 rotatably disposed on the connection block 6, the gear 7 is sleeved outside the fixing pin 62, in order to conveniently implement installation of the gear 7, mounting grooves 64 are disposed on two sides of the connection block 6, the mounting grooves 64 are communicated with the mounting holes 61, thicknesses of the mounting grooves 64 are equal to thicknesses of the gear 7, a sliding hole 71 matched with the fixing pin 62 is disposed on the gear 7, an inner diameter of the sliding hole 71 is equal to an outer diameter of the fixing pin 62, a spiral groove 711 is disposed on an inner wall of the sliding hole 71, a slider 622 is disposed on the fixing pin 62, the slider 622 is slidably disposed in the spiral groove 711, a rack 8 capable of being engaged with the gear 7 is slidably disposed on the tool rest 4, the rack 8 is disposed along a Z direction of the tool rest 1, one end of the rack 8 is engaged with the gear 7, and the other end extends to an edge of the tool rest 4.

During operation, the rack 8 is driven to slide to drive the gear 7 to rotate, and the fixing pin 62 can be driven to extend out and retract in the mounting hole 61 under the driving of the sliding block 622 and the spiral groove 711, so that the connecting block 6 and the tool rest 4 are locked and unlocked.

The implementation principle of the ultra-precise turning and milling composite numerical control machine tool in the embodiment of the application is as follows: during machining, a workpiece is clamped on the clamp 22, the ultra-precision rotary table 11 rotates, the position of the first air static pressure spindle 21 is adjusted, the workpiece is adjusted to a required machining position, then the servo motor drives the first static pressure spindle to rotate, and the rough turning tool 41 and the finish turning tool 42 perform rough turning and finish turning operations on the workpiece in sequence under the driving of the first servo motor 32 and the second servo motor 33; then the first hydrostatic spindle stops rotating under the control of the servo motor, the rough milling cutter 43 and the fine milling cutter 44 rotate, and move towards the workpiece and finish cutting under the drive of the first servo motor 32 and the second servo motor 33;

when the fixing of the connecting block 6 and the tool holder 4 is to be released, the slide rack 8 and the drive gear 7 are rotated, the slider 622 slides in the spiral groove 711, the fixing pin 62 slides in the mounting hole 61 under the guidance of the spiral groove 711, and the tool holder 4 is freely moved when the connecting block 6 and the tool holder 4 are released.

The above embodiments are preferred embodiments of the present application, and the protection scope of the present application is not limited by the above embodiments, so: all equivalent changes made according to the structure, shape and principle of the present application shall be covered by the protection scope of the present application.

Claims

1. The utility model provides an ultra-precision turn-milling compound digit control machine tool, includes lathe bed (1), be equipped with main shaft system (2) that are used for the clamping work piece on lathe bed (1), still be equipped with drive arrangement (3) of X direction and Z direction displacement, its characterized in that along knife rest (4) and drive knife rest (4) on lathe bed (1): the tool rest is characterized in that a rough milling cutter (43), a fine milling cutter (44), a rough turning tool (41) and a fine turning tool (42) are sequentially arranged on the tool rest (4) along the length direction of the tool rest (4), and a power device for driving the rough milling cutter (43) and the fine milling cutter (44) to rotate is arranged on the tool rest (4).

2. The ultra-precise turn-milling composite numerical control machine tool according to claim 1, characterized in that: the spindle system (2) comprises a first aerostatic spindle (21) fixedly arranged on the lathe bed (1), the first aerostatic spindle (21) has an indexing function, and a clamp (22) used for clamping a workpiece is arranged on the first aerostatic spindle (21).

3. The ultra-precise turn-milling composite numerical control machine tool according to claim 2, characterized in that: the air static pressure type air compressor is characterized in that an ultra-precise rotary table (11) is arranged on the machine body (1), the ultra-precise rotary table (11) is horizontally and rotatably arranged on the machine body (1), and the first air static pressure main shaft (21) is arranged on the ultra-precise rotary table (11).

4. The ultra-precise turn-milling composite numerical control machine tool according to claim 1, characterized in that: the power device comprises a second aerostatic spindle (5) which corresponds to the rough milling cutter (43) and the finish milling cutter (44), and the second aerostatic spindle (5) is fixedly connected with the cutter rest (4).

5. The ultra-precise turn-milling composite numerical control machine tool according to claim 1 or 4, characterized in that: the driving device (3) comprises a sliding seat (31) which is arranged on the lathe bed (1) in a sliding mode along the X direction, and a first driving piece which drives the sliding seat (31) to slide along the X direction is arranged on the lathe bed (1); the tool rest (4) is arranged on the sliding seat (31) in a sliding mode along the Z direction, and a second driving piece for driving the tool rest (4) to slide along the Z direction is arranged on the sliding seat (31).

6. The ultra-precise turn-milling composite numerical control machine tool according to claim 5, characterized in that: the first driving piece comprises a first servo motor (32), a first lead screw (321) is rotatably connected to the lathe bed (1), the first lead screw (321) is in threaded connection with the sliding seat (31), and an output shaft of the first servo motor (32) is connected with the first lead screw (321); the second driving piece comprises a second servo motor (33), a second lead screw (331) is connected to the sliding base (31) in a rotating mode, the second lead screw (331) is in threaded connection with the tool rest (4), and an output shaft of the second servo motor (33) is connected with the second lead screw (331).

7. The ultra-precise turn-milling composite numerical control machine tool according to claim 1, characterized in that: the rough milling cutter (43), the finish milling cutter (44), the rough turning cutter (41) and the finish turning cutter (42) sequentially extend out of the tool rest (4) in a step shape along the length direction of the tool rest (4).

8. The ultra-precise turn-milling composite numerical control machine tool according to claim 6, characterized in that: threaded connection has connecting block (6) on second lead screw (331), it is equipped with fixed pin (62) to slide along perpendicular to second lead screw (331) length direction on connecting block (6), be equipped with the elastic component that drive fixed pin (62) slided towards knife rest (4) on connecting block (6), be equipped with on knife rest (4) with fixed pin (62) complex fixed orifices (45), be equipped with the driving medium that is used for driving fixed pin (62) roll-off fixed orifices (45) on knife rest (4).

9. The ultra-precision turn-milling composite numerical control machine tool according to claim 8, characterized in that: be equipped with mounting hole (61) on connecting block (6), square post (611) of fixedly connected with in mounting hole (61), be equipped with on fixed pin (62) with square post (611) complex quad slit (621), the elastic component is including setting up spring (63) in quad slit (621), spring (63) one end is fixed with square post (611) top, and the other end is fixed with quad slit (621).

10. The ultra-precise turn-milling composite numerical control machine tool according to claim 9, characterized in that: the driving piece is including rotating gear (7) that sets up on connecting block (6), gear (7) cover is established outside fixed pin (62), be equipped with on gear (7) with fixed pin (62) complex slide opening (71), be equipped with on the inner wall of slide opening (71) helicla flute (711), be equipped with slider (622) on fixed pin (62), slider (622) slide and set up in helicla flute (711).