A high-precision CNC machine tool for turning and milling shaft parts

Abstract

This invention relates to the field of machine tool technology, and in particular to a high-precision CNC machine tool for turning and milling shaft parts, comprising a spindle mechanism, a turning mechanism, a milling mechanism, and a guide rail; the spindle mechanism includes a spindle fixture; both the turning and milling mechanisms are equipped with support mechanisms; the turning mechanism includes a turning linear module and a turning unit located at the movable end of the turning linear module; the milling mechanism includes a milling linear module and a milling unit located at the movable end of the milling linear module; the support mechanism includes a support slide, a clamping seat, and a linkage rod; one end of the support slide is slidably connected to the guide rail; one end of the clamping seat is slidably sleeved on the support slide, and the other end is equipped with a clamping jaw; one end of the linkage rod is located at the movable end of the turning linear module or the milling linear module; the other end of the linkage rod is drively connected to the clamping seat. This achieves synchronous movement of the clamping jaw with the tool position during the turning and milling process, improving machining stability and coaxiality accuracy, and is suitable for the high-precision machining requirements of milling and milling composite machining.

Description

Technical Field

[0001] This invention relates to the field of machine tool technology, and in particular to a high-precision CNC machine tool for turning and milling shaft parts. Background Technology

[0002] When machining shaft parts on a milling-turning CNC machine tool, multiple processes such as turning and milling are usually required to be completed in a single setup. This is especially true when machining long and slender shaft parts, where bending and vibration are easily caused by their own weight and cutting forces during the cutting process. Existing milling-turning CNC machine tools mostly use fixed center supports or tailstocks to support the workpiece. The support position is relatively fixed and cannot be adjusted synchronously with the changes in the tool's position along the axial feed. This results in a cantilever section between the tool's machining position and the support point, which affects machining stability, surface quality, and coaxiality accuracy, making it difficult to meet the composite machining requirements of high-precision shaft parts. Summary of the Invention

[0003] The purpose of this invention is to overcome the above-mentioned shortcomings and provide a high-precision CNC machine tool for turning and milling shaft parts.

[0004] To achieve the above objectives, the specific solution of the present invention is as follows:

[0005] A high-precision CNC machine tool for turning and milling shaft parts includes a machine cover and a machine tool table disposed on the machine cover; it also includes two spindle mechanisms that are slidably disposed on the machine tool table, a turning mechanism and a milling mechanism disposed side by side on the machine tool table and located between the two spindle mechanisms, and a guide rail disposed between the two spindle mechanisms.

[0006] Each spindle mechanism includes a spindle fixture for holding shaft-type blank workpieces; both the turning mechanism and the milling mechanism are equipped with support mechanisms; the turning mechanism includes a turning linear module and a turning unit located at the movable end of the turning linear module; the milling mechanism includes a milling linear module and a milling unit located at the movable end of the milling linear module.

[0007] Each support mechanism includes a support slide, a clamping seat, and a linkage rod; one end of the support slide is slidably connected to the guide rail; one end of the clamping seat is slidably sleeved on the support slide, and the other end is provided with a clamping jaw; one end of the linkage rod is located at the movable end of the turning linear module or the milling linear module; the other end of the linkage rod is connected to the clamping seat in a transmission manner; when the movable end of the turning linear module or the milling linear module drives the linkage rod to move linearly, the linkage rod synchronously drives the clamping seat to drive the clamping jaw to move towards or away from each other.

[0008] In some embodiments, the support slide is provided with a linkage box; the linkage box is divided into a first cavity and a second cavity; the first cavity is provided with a first piston push rod that divides the first cavity into a first rodless cavity and a first rod cavity; the first piston push rod is fixedly connected to the other end of the linkage rod; the second cavity is provided with a second piston push rod that divides the second cavity into a second rodless cavity and a second rod cavity; the second piston push rod is fixedly connected to one end of the clamping seat; the first rodless cavity and the second rod cavity are in communication; the linkage rod and the clamping seat are synchronously linked under the action of the first piston push rod and the second piston push rod.

[0009] In some embodiments, the support slide is further provided with a buffer box; the buffer box is provided with a valve plate; a buffer cavity is formed between one side of the valve plate and the inner wall of the buffer box; the side of the buffer box near the linkage box is provided with an inlet and an outlet communicating with the first rodless cavity; an overflow valve is provided in the inlet; a one-way valve is provided in the outlet; and a spring is connected between the other side of the valve plate and the inner wall of the buffer box.

[0010] In some embodiments, the number of springs is provided as two; the two springs are arranged side by side with a gap between them.

[0011] In some embodiments, the support slide is provided with a through mounting hole; the linkage box is fixed in the mounting hole; an avoidance hole is provided in the mounting hole; a connecting boss protrudes from the other end of the linkage rod; the connecting boss is movably passed through the avoidance hole and then fixedly connected to the first piston push rod.

[0012] In some embodiments, one end of the clamping seat is provided with a sliding hole; the clamping seat is sleeved on the supporting slide through the sliding hole; a first slide platform is provided on both sides of the sliding hole; the first slide platform is slidably disposed in the mounting hole; and the second piston push rod is fixedly connected to the corresponding first slide platform.

[0013] In some embodiments, the other end of the clamping seat is provided with two clamping claws spaced apart.

[0014] In some embodiments, a connecting rod is movably provided at the other end of the clamping seat; the middle part of the connecting rod is hinged to the clamping seat; and the two grippers are respectively hinged to the two ends of the connecting rod.

[0015] In some embodiments, the gripper includes a gripping arm and two gripping balls; one end of the gripping arm is hinged to a connecting rod; the two gripping balls are spaced apart and respectively ball-jointed to the other end of the gripping arm.

[0016] In some embodiments, a second slide is provided at one end of the support slide; a slide groove is provided on the guide rail; and the second slide is slidably disposed in the slide groove.

[0017] The beneficial effects of this invention are as follows: By setting a guide rail between two spindle mechanisms and setting support mechanisms that slide with the guide rail on the turning mechanism and the milling mechanism respectively, this invention achieves the synchronous movement of the chuck with the tool position during the turning and milling process through the linkage between the linkage rod and the clamping seat, thereby clamping and supporting the workpiece. This effectively shortens the length of the suspended machining section of the workpiece, improves the stress state of long and thin shaft parts, reduces machining vibration, and improves machining stability and coaxiality accuracy. It is especially suitable for the high-precision machining requirements of shaft parts under the combined turning and milling conditions. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the structure of the present invention;

[0019] Figure 2 This is a partial structural schematic diagram of the present invention;

[0020] Figure 3 This is a schematic diagram of the turning mechanism and milling mechanism of the present invention;

[0021] Figure 4 This is a schematic diagram of the turning mechanism and milling mechanism of the present invention from another perspective;

[0022] Figure 5 This is a schematic diagram of the support mechanism of the present invention;

[0023] Figure 6 This is a cross-sectional schematic diagram of the support mechanism of the present invention;

[0024] Figure 7 This is an exploded view of the clamping mechanism, connecting rod, and gripper of the present invention;

[0025] Figure 8 This is a cross-sectional schematic diagram of the clamping, connecting rod, and gripper engagement of the present invention;

[0026] Explanation of reference numerals in the attached drawings: 1. Machine cover; 2. Machine tool table; 3. Spindle mechanism; 31. Spindle fixture; 41. Turning linear module; 42. Turning unit; 51. Milling linear module; 52. Milling unit; 6. Guide rail; 61. Slide groove; 7. Support mechanism; 71. Support slide; 711. Second slide; 712. Clearance hole; 72. Clamping seat; 721. First slide; 73. Linkage rod; 74. Clamping jaw; 741. Clamping arm; 742. Clamping ball; 751. Linkage box; 7511. First cavity; 7512. Second cavity; 752. First piston push rod; 753. Second piston push rod; 754. Buffer box; 7541. Buffer chamber; 7542. Overflow valve; 7543. Check valve; 755. Valve plate; 756. Spring; 76. Connecting rod. Detailed Implementation

[0027] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments, but this is not to limit the scope of the invention to this.

[0028] It should be noted that when a component is referred to as being "fixed to" or "set on" another component, it can be directly on or indirectly on that other component. When a component is referred to as being "connected to" another component, it can be directly connected to or indirectly connected to that other component.

[0029] It should also be noted that the directional terms such as left, right, up, and down in this embodiment are only relative concepts or are based on the normal use of the product, and should not be considered as restrictive.

[0030] Reference Figures 1 to 8 As shown in the figure, the high-precision CNC machine tool for turning and milling of shaft parts described in this embodiment includes a spindle mechanism 3, a turning mechanism, a milling mechanism and a guide rail 6;

[0031] Two spindle mechanisms 3 are slidably mounted on the slide of the machine tool table 2; the slide of the machine tool table 2 can drive the two spindle mechanisms 3 to slide synchronously; the turning mechanism and the milling mechanism are mounted side by side on the fixed platform of the machine tool table 2 and located between the two spindle mechanisms 3; the guide rail 6 is fixed to the outer wall of the spindle box of the spindle mechanism 3, so that when the two spindle mechanisms 3 slide, the guide rail 6 is moved synchronously.

[0032] Furthermore, each spindle mechanism 3 includes a spindle clamp 31 for holding shaft-type blank workpieces. The spindle clamp 31 holds the shaft-type blank workpieces (hereinafter referred to as workpieces) for milling and turning combined machining. Both the turning mechanism and the milling mechanism are equipped with support mechanisms 7. The turning mechanism includes a turning linear module 41 and a turning unit 42 located at the movable end of the turning linear module 41. The turning linear module 41 drives the turning unit 42 to move, thereby realizing the feed of the turning unit 42 to perform turning machining on the workpiece. The milling mechanism includes a milling linear module 51 and a milling unit 52 located at the movable end of the milling linear module 51. The milling linear module 51 drives the milling unit 52 to move, thereby realizing the feed of the milling unit 52 to perform milling machining on the workpiece. The movement direction of the turning unit 42 and the milling unit 52 is perpendicular to the movement direction of the spindle mechanism 3, that is, the feed direction of the turning unit 42 and the milling unit 52 is perpendicular to the movement direction of the spindle mechanism 3. The axial sliding direction is perpendicular to ensure that the gripper 74 and the tool act synchronously from both sides of the workpiece;

[0033] It is understood that the milling linear module 51 and the turning linear module 41 both adopt the existing linear module structure; the turning unit 42 and the milling unit 52 both adopt the existing structure, which will not be described in detail here.

[0034] To prevent machining debris from affecting the turning and milling mechanisms, therefore, such as Figures 2 to 4 As shown, both the movable end of the turning linear module 41 and the movable end of the milling linear module 51 are equipped with shields; the turning unit 42 and the milling unit 52 are respectively installed on the corresponding shields.

[0035] Furthermore, refer to Figures 5 to 8 As shown, each support mechanism 7 includes a support slide 71, a clamping seat 72, and a linkage rod 73. One end of the support slide 71 is slidably connected to the guide rail 6. Thus, when the spindle mechanism 3 moves the workpiece, the support mechanism 7 moves synchronously relative to the workpiece in cooperation with the guide rail 6, thereby automatically adapting to changes in the workpiece's machining position. Simultaneously, the support slide 71 remains stationary during the feeding of the turning unit 42 or the milling unit 52. The upper end of the clamping seat 72 is slidably fitted onto the support slide 71, and the lower end is provided with a clamping jaw 74. The milling unit 52 and the turning unit 42, along with their corresponding clamping jaws 74, are distributed on both sides of the workpiece. The lower end of the linkage rod 73 of the support mechanism 7 located in the turning mechanism is positioned on the turning line. Module 41, located at the lower end of the linkage rod 73 of the support mechanism 7 of the milling mechanism, is located at the movable end of the milling linear module 51; the upper end of the linkage rod 73 is connected to the clamping seat 72 for transmission; when the movable end of the turning linear module 41 or the milling linear module 51 drives the linkage rod 73 to move linearly, the linkage rod 73 synchronously drives the clamping seat 72 to drive the grippers 74 to move towards or away from each other; in this way, the grippers 74 and the corresponding turning unit 42 or milling unit 52 act on the workpiece from both sides near the machining area to clamp and support the workpiece, thereby reducing the length of the suspended section of the workpiece during the turning and milling compound machining process, and reducing the deflection and vibration of long and thin shaft parts caused by their own weight and cutting force.

[0036] It is understandable that the support mechanism 7 on the turning mechanism and the milling mechanism can share a guide rail 6. In this case, the two ends of the guide rail 6 are respectively fixedly installed on the outer wall of the spindle box of the two spindle mechanisms 3. Alternatively, two guide rails 6 can be set to cooperate with the two support mechanisms 7 one by one. In this case, the fixed end of the guide rail 6 is respectively fixedly installed on the outer wall of the spindle box of the spindle mechanism 3.

[0037] Reference Figure 5 and Figure 6As shown in the embodiment, in some implementations of the high-precision CNC machine tool for turning and milling shaft parts, the support slide 71 is provided with a linkage box 751; the linkage box 751 is divided into a first cavity 7511 and a second cavity 7512 filled with hydraulic oil; the first cavity 7511 is provided with a first piston push rod 752 that divides the first cavity 7511 into a first rodless cavity and a first rod cavity; the first piston push rod 752 is fixedly connected to the upper end of the linkage rod 73; the second cavity 7512 is provided with a second piston push rod 753 that divides the second cavity 7512 into a second rodless cavity and a second rod cavity; the second piston push rod 753 is fixedly connected to the upper end of the clamping seat 72; the first rodless cavity and the second rod cavity are in communication; the linkage rod 73 and the clamping seat 72 are synchronously linked under the action of the first piston push rod 752 and the second piston push rod 753.

[0038] Specifically, taking the turning process of a workpiece as an example, the movable end of the turning linear module 41 drives the turning unit 42 to feed towards the machining position of the workpiece. At the same time, the movable end of the turning linear module 41 drives the linkage rod 73 of the support mechanism 7 to move. The linkage rod 73 pushes the first piston push rod 752 to move. At this time, the effective volume in the first rodless cavity decreases. Since the first rodless cavity is connected to the second rod cavity, the first piston push rod 752 pushes the hydraulic oil in the first rodless cavity into the second rod cavity, causing the second piston push rod 752 to move. 3. Under the pressure of the oil pressure, the second piston push rod 753 moves synchronously in the opposite direction to the first piston push rod 752, thereby increasing the effective volume of the second rod chamber. When the second piston push rod 753 moves, it synchronously drives the clamping seat 72 to move. The clamping seat 72 drives the jaws 74 to move toward the workpiece until the jaws 74 contact the workpiece surface. At this time, when the turning unit 42 is machining the workpiece, the turning unit 42 and the jaws 74 act on the workpiece from both sides, thereby locally clamping and supporting the workpiece, thereby enhancing the stability of the workpiece during the turning process.

[0039] Similarly, during milling, the milling process uses the same principle to create local clamping and support for the workpiece, which will not be elaborated here. This allows the gripper 74 to move synchronously with the tool position during the turning and milling process, effectively shortening the length of the suspended machining section, improving the workpiece's stress state, reducing machining vibration, and enhancing machining stability and coaxiality accuracy. This is particularly suitable for the high-precision machining requirements of shaft parts under combined turning and milling conditions.

[0040] In addition, this embodiment uses a hydraulic cylinder structure through a linkage box 751, a first piston push rod 752, and a second piston push rod 753 to achieve linkage between the linkage rod 73 and the clamping seat 72. Compared with other transmission methods, such as gear and rack transmission, the gripper 74 has a buffering effect during clamping and support to protect the workpiece.

[0041] In some embodiments, when a rack and pinion drive is used, the gear is rotatably installed in the linkage box 751; one rack is fixedly connected to the upper end of the linkage rod 73, and the other rack is fixedly connected to the clamping seat 72. The two racks are centrally symmetrical and both mesh with the gear, thereby realizing the synchronous reverse movement of the linkage rod 73 and the clamping seat 72.

[0042] Reference Figure 6 As shown in the embodiment, in some implementations of the high-precision CNC machine tool for turning and milling shaft parts, the support slide 71 is further provided with a buffer box 754; the buffer box 754 is provided with a valve plate 755; a buffer cavity 7541 is formed between one side of the valve plate 755 and the inner wall of the buffer box 754; the side of the buffer box 754 near the linkage box 751 is provided with an inlet and an outlet communicating with the first rodless cavity; an overflow valve 7542 is provided in the inlet; a one-way valve 7543 is provided in the outlet; a spring 756 is connected between the other side of the valve plate 755 and the inner wall of the buffer box 754. Preferably, there are two springs 756; the two springs 756 are arranged side by side with intervals; this arrangement makes the valve plate 755 more evenly stressed and its movement more stable.

[0043] Specifically, in practical applications, due to the different diameters of the workpieces, after the gripper 74 contacts the workpiece surface, the cutting tool of the turning unit 42 or the cutting tool of the milling unit 52 still needs to be fed. However, the second piston rod 753 cannot be moved at this time because it is blocked by the clamping seat 72. At this time, the overflow valve 7542 in the inlet of the buffer box 754 opens, and the hydraulic oil in the first rodless chamber enters the buffer chamber 7541 through the inlet, thereby pushing the valve plate 755 to compress the spring 756 and slide, thereby realizing the further feeding of the cutting tool of the turning unit 42 or the cutting tool of the milling unit 52. In this way, it can adapt to the processing needs of workpieces with different diameters and the structure is more flexible.

[0044] After machining is completed, the cutting tool of the turning unit 42 or the cutting tool of the milling unit 52 retracts, the linkage rod 73 moves away from the workpiece, and the linkage rod 73 drives the first piston push rod 752 to move, increasing the effective volume of the first rodless chamber. At this time, the pressure in the first rodless chamber decreases, the spring 756 resets, and pushes the valve plate 755 to reset, thereby opening the one-way valve 7543 in the outlet. At this time, the hydraulic oil in the buffer chamber 7541 flows back to the first rodless chamber through the outlet, and at the same time, the hydraulic oil in the second rod chamber flows back to the first rodless chamber under pressure, causing the second piston push rod 753 to reset. The clamping seat 72 drives the jaw 74 to move away from the workpiece, thereby releasing the machined workpiece.

[0045] Reference Figure 6As shown in the embodiment, in some implementations of the high-precision CNC machine tool for turning and milling shaft parts, the support slide 71 has a through mounting hole; the linkage box 751 is fixedly installed in the mounting hole; a clearance hole 712 is provided through the mounting hole; a connecting boss protrudes from the upper end of the linkage rod 73; the connecting boss is movably inserted through the clearance hole 712 and then fixedly connected to the first piston push rod 752. In this embodiment, the mounting hole facilitates the assembly of the linkage box 751 and the buffer box 754; the clearance hole 712 provides clearance space for the connecting boss, allowing the linkage rod 73 to drive the first piston push rod 752 to move synchronously.

[0046] Reference Figures 5 to 8 As shown in the embodiment, in some implementations of the high-precision CNC machine tool for milling and turning shaft parts, the upper end of the clamping seat 72 is provided with a sliding hole; the clamping seat 72 is sleeved on the supporting slide 71 through the sliding hole; first slides 721 are protruding on both sides of the sliding hole; the first slides 721 are slidably disposed in the mounting hole; the second piston push rod 753 is fixedly connected to the corresponding first slide 721. In this embodiment, by setting the first slide 721 to slide with the mounting hole, the clamping seat 72 moves more stably under the drive of the second piston push rod 753, so that the gripper 74 can reliably clamp and support the workpiece.

[0047] Refer to 5 to Figure 8 As shown in this embodiment, the milling and turning high-precision CNC machine tool for shaft parts has, in some embodiments, two jaws 74 spaced apart at the lower end of the clamping seat 72. This embodiment, through the above-mentioned arrangement, further enhances the clamping and support of the workpiece, and further provides stability during workpiece machining.

[0048] Reference Figure 7 and Figure 8 As shown in the embodiment, the high-precision CNC machine tool for turning and milling shaft parts in this embodiment has, in some implementations, a movable cavity at the lower end of the clamping seat 72, within which a connecting rod 76 is movably mounted; the middle part of the connecting rod 76 is hinged to the clamping seat 72; and the two jaws 74 respectively movably pass into the movable cavity and are correspondingly hinged to the two ends of the connecting rod 76. With the above-described configuration, when the workpiece undergoes a change in shaft diameter due to different axial positions during turning and milling, especially when transitioning from a coarse shaft section to a fine shaft section, the jaws 74 corresponding to the coarse shaft section cannot move against it. However, the tool continues to feed towards the workpiece. Under the action of the connecting rod 76, the clamping seat 72 drives the jaws 74 corresponding to the fine shaft section to continue moving towards the workpiece until they abut against the fine shaft section. This provides continuous clamping and support for the shaft parts, adapting to machining scenarios with changes in shaft diameter.

[0049] Reference Figures 5 to 8As shown in this embodiment, the milling and turning composite high-precision CNC machine tool for shaft parts, in some embodiments, includes a gripper 74 comprising a gripping arm 741 and two gripping balls 742; one end of the gripping arm 741 movably inserts into the movable cavity and is hinged to the connecting rod 76; the two gripping balls 742 are spaced vertically and respectively ball-jointed to the other end of the gripping arm 741. With this arrangement, during machining, the spaced gripping balls 742 can both clamp the workpiece and provide reliable support, thus further enhancing the stability of the workpiece during machining and further improving coaxiality accuracy.

[0050] Reference Figure 2 , Figure 5 and Figure 6 As shown in the embodiment of the high-precision CNC machine tool for turning and milling shaft parts, in some embodiments, a second slide 711 protrudes from one end of the support slide 71; a slide groove 61 is formed on the guide rail 6; and the second slide 711 is slidably disposed within the slide groove 61. In this embodiment, by setting the second slide 711 to cooperate with the slide groove 61, the support slide 71 can reliably support itself on the guide rail 6 and slide relative to the guide rail 6, thereby improving the stability of the gripper 74 during operation.

[0051] The above description is only a preferred embodiment of the present invention. Therefore, any equivalent changes or modifications made to the structure, features and principles described in the claims of this patent application are included within the protection scope of this patent application.

Claims

1. A high-precision CNC machine tool for turning and milling shaft parts, characterized in that, It includes two spindle mechanisms that slide relative to each other on the machine tool table, a turning mechanism and a milling mechanism that are arranged side by side on the machine tool table and located between the two spindle mechanisms, and a guide rail located between the two spindle mechanisms; Each spindle mechanism includes a spindle fixture for holding shaft-type blank workpieces; both the turning mechanism and the milling mechanism are equipped with support mechanisms; the turning mechanism includes a turning linear module and a turning unit located at the movable end of the turning linear module; the milling mechanism includes a milling linear module and a milling unit located at the movable end of the milling linear module. Each support mechanism includes a support slide, a clamping seat, and a linkage rod. One end of the support slide is slidably connected to the guide rail. The upper end of the clamping seat is slidably sleeved on the support slide, and the lower end is provided with a clamping jaw. One end of the linkage rod is located at the movable end of the turning linear module or the milling linear module. The other end of the linkage rod is connected to the clamping seat in a transmission manner. When the movable end of the turning linear module or the milling linear module drives the linkage rod to move linearly, the linkage rod synchronously drives the clamping seat to drive the clamping jaw to move towards or away from each other, so that the clamping jaw and the corresponding turning unit or milling unit act together on the workpiece from both sides near the processing area to clamp and support the workpiece. The supporting slide is equipped with a linkage box; the linkage box is divided into a first cavity and a second cavity; the first cavity is equipped with a first piston push rod that divides the first cavity into a first rodless cavity and a first rod cavity; the first piston push rod is fixedly connected to the other end of the linkage rod; the second cavity is equipped with a second piston push rod that divides the second cavity into a second rodless cavity and a second rod cavity; the second piston push rod is fixedly connected to one end of the clamping seat; the first rodless cavity and the second rod cavity are in communication; the linkage rod and the clamping seat are synchronously linked under the action of the first piston push rod and the second piston push rod. The support slide is also equipped with a buffer box; the buffer box is equipped with a valve plate; a buffer cavity is formed between one side of the valve plate and the inner wall of the buffer box; the side of the buffer box near the linkage box is equipped with an inlet and an outlet that communicate with the first rodless cavity; an overflow valve is provided in the inlet; a one-way valve is provided in the outlet; a spring is connected between the other side of the valve plate and the inner wall of the buffer box. The movement direction of the turning unit and the milling unit is perpendicular to the movement direction of the spindle mechanism.

2. The high-precision CNC machine tool for turning and milling shaft parts according to claim 1, characterized in that, The number of springs is set to two; the two springs are arranged side by side with an interval.

3. A high-precision CNC machine tool for turning and milling shaft parts according to claim 1, characterized in that, The support slide is provided with a through mounting hole; the linkage box is fixed in the mounting hole; an avoidance hole is provided in the mounting hole; a connecting boss protrudes from the other end of the linkage rod; the connecting boss is movably passed through the avoidance hole and then fixedly connected to the first piston push rod.

4. A high-precision CNC machine tool for turning and milling shaft parts according to claim 3, characterized in that, One end of the clamping seat is provided with a sliding hole; the clamping seat is sleeved on the supporting slide through the sliding hole; a first slide platform is provided on both sides of the sliding hole; the first slide platform is slidably disposed in the mounting hole; the second piston push rod is fixedly connected to the corresponding first slide platform.

5. A high-precision CNC machine tool for turning and milling shaft parts according to claim 1, characterized in that, The other end of the clamping seat is provided with two clamping claws spaced apart.

6. A high-precision CNC machine tool for turning and milling shaft parts according to claim 5, characterized in that, The other end of the clamping seat is movably provided with a connecting rod; the middle part of the connecting rod is hinged to the clamping seat; the two grippers are respectively hinged to the two ends of the connecting rod.

7. A high-precision CNC machine tool for turning and milling shaft parts according to claim 6, characterized in that, The gripper includes a gripping arm and two gripping balls; one end of the gripping arm is hinged to a connecting rod; the two gripping balls are spaced apart and respectively ball-connected to the other end of the gripping arm.

8. A high-precision CNC machine tool for turning and milling shaft parts according to claim 1, characterized in that, The support slide has a second slide protruding from one end; the guide rail has a slide groove; the second slide is slidably disposed in the slide groove.

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