Clamping tool for lathe inner hole turning and using method

Abstract

The invention discloses a clamping tool for lathe inner hole turning and a using method, and belongs to the technical field of machining, the clamping tool comprises a hollow main shaft, one end of the hollow main shaft is connected with a first connecting structure, the first connecting structure is connected with a limiting structure, the limiting structure is connected with a chuck sleeve, and the end, away from the limiting structure, of the chuck sleeve is provided with a tool base; a plurality of airtight hole structures are arranged on the tool base and are communicated with an inner cavity of the hollow main shaft; a connecting block is arranged in the limiting structure, and a chuck is arranged in the chuck sleeve. A spindle pull rod is arranged in an inner cavity of the hollow spindle and can axially move in the inner cavity of the hollow spindle, one end of the spindle pull rod is connected with a connecting block, the connecting block is connected with a chuck, the end, away from the connecting block, of the chuck is connected with a plurality of rotary pressing structures, and the rotary pressing structures protrude out of the tool base. The main shaft pull rod drives the rotary clamping structure to rotate, clamp and loosen at the same time, stable clamping of a workpiece is achieved, and the machining precision is guaranteed.

Description

Technical Field

[0001] The present invention relates to the technical field of machining, and particularly relates to a clamping tooling for machining internal holes in a lathe and a using method thereof. Background Art

[0002] The current clamping method for machining internal holes in thin-walled plates is to drive a pressing plate structure to move along the axis of the lathe spindle by setting a hydraulic cylinder at the end of the lathe to clamp the workpiece. However, this method has the following problems: First, when setting multiple hydraulic cylinders to drive the pressing plate structure to move respectively, there is a lack of synchronization between the hydraulic cylinders. There is often a situation where one hydraulic cylinder controls the pressing plate structure to clamp, while the clamping plate structures controlled by other hydraulic cylinders fail to clamp. At this time, the workpiece clamping is not stable, affecting the machining. In addition, when multiple hydraulic cylinders clamp, when the clamping forces of the hydraulic cylinders controlling the pressing plate structure are different, it will also cause the workpiece clamping to shift, affecting the internal hole machining accuracy. And separately adjusting the multiple hydraulic cylinders to control the pressing plate is time-consuming and laborious, seriously affecting the machining efficiency. Second, even when setting a single hydraulic cylinder at the machining clamping end of the lathe to control multiple pressing plate structures to clamp, the setting of the hydraulic cylinder makes the structure of the lathe end very complex, and it cannot be effectively matched with the structures such as the lathe spindle and the lathe drawbar, increasing the overall cost of the tooling. And when maintaining and repairing the hydraulic cylinder, it is necessary to disassemble the lathe end as a whole for repair, increasing the workload of the operators. Third, the clamping tooling lacks a leveling structure, making it impossible to judge whether the clamping of the clamped workpiece is in place and whether the clamping posture of the workpiece is correct. Fourth, when the current pressing plate structure clamps and machines the workpiece, the generated iron chips are easy to wind around the tooling and are not easy to clean. And when the pressing plate structure clamps a workpiece with a relatively complex structure, such as Figure 8 the workpiece shown, there is less avoidance space. When installing and clamping the workpiece, the convex structure at the edge of the workpiece is easy to interfere with the pressing plate structure, making the installation difficult and injuring the fingers, having a certain safety hazard. Summary of the Invention

[0003] Aiming at the problems existing in the prior art, the present invention provides a clamping tooling for machining internal holes in a lathe and a using method thereof. By setting multiple rotary clamping structures at the clamping end of the lathe to clamp the workpiece, the multiple rotary clamping structures are connected to the drawbar inside the lathe spindle through a chuck and a connecting block. The drawbar moves axially along the spindle inside the spindle to drive the multiple rotary clamping structures to clamp and loosen simultaneously, realizing stable clamping of a workpiece with a relatively complex structure, improving the machining efficiency, and ensuring the machining accuracy.

[0004] The technical solution of the present invention is as follows: In the first aspect of the present invention, a clamping tooling for machining the inner hole of a lathe is provided, which includes a hollow spindle. One end of the hollow spindle is connected to a first connection structure, the first connection structure is connected to a limit structure, the limit structure is connected to a chuck sleeve, and a tooling base is provided at one end of the chuck sleeve away from the limit structure. A plurality of airtight hole structures are provided on the tooling base, and the plurality of airtight hole structures communicate with the inner cavity of the hollow spindle; a connection block is provided inside the limit structure, and a chuck is provided inside the chuck sleeve. A spindle pull rod is provided in the inner cavity of the hollow spindle. The spindle pull rod can axially move in the inner cavity of the hollow spindle. One end of the spindle pull rod protrudes from the inner cavity of the hollow spindle to connect the connection block, the connection block is connected to the chuck, and one end of the chuck away from the connection block is connected to a plurality of rotary pressing structures, and the plurality of rotary pressing structures protrude from the tooling base. In some embodiments of the present invention, the hollow spindle includes a small-diameter section hollow spindle and a large-diameter section hollow spindle. A plurality of first connection holes are circumferentially provided along the axis of the hollow spindle on the large-diameter section hollow spindle. A plurality of second connection holes are provided on the first connection structure. The first connection structure and the large-diameter section hollow spindle are connected by a plurality of first connection bolts respectively passing through the plurality of first connection holes and the plurality of second connection holes. In some embodiments of the present invention, a groove structure with a certain depth is provided at one end of the limit structure close to the first connection structure, and the first connection structure is clamped with the limit structure through the groove structure; A plurality of third connection holes are circumferentially provided along the axis of the hollow spindle on the peripheral side of the edge of the limit structure. A plurality of fourth connection holes are provided on the chuck sleeve. The limit structure and the chuck sleeve are connected by a plurality of second connection bolts respectively passing through the plurality of third connection holes and the plurality of fourth connection holes. In some embodiments of the present invention, a through hole is provided along the axis of the limit structure, and a connection block is provided in the through hole. The connection block can slide in the through hole; the connection block is provided with an internal thread structure, and one end of the spindle pull rod protrudes from the inner cavity of the hollow spindle and is connected to the connection block through the internal thread structure. In some embodiments of the present invention, a plurality of cylindrical holes are provided on the end face of the limit structure close to the chuck end. The positions of the cylindrical holes correspond to the positions of the rotary pressing structures provided on the chuck. When the plurality of rotary pressing structures move axially along the hollow spindle, they can respectively enter and exit the plurality of cylindrical holes. In some embodiments of the present invention, the rotary pressing structure includes a rotary sleeve, a rotary shaft, a connection nut and a pressing jaw; One end of the rotating shaft passes through the chuck and is connected by a connecting nut at one end of the chuck close to the limit block. The other end of the rotating shaft passes through the tooling base and is connected to the clamping jaw. The rotating sleeve is arranged outside the rotating shaft between the chuck and the tooling base. A travel groove is provided on the rotating sleeve, and a cylindrical pin is provided on the rotating shaft, and the cylindrical pin is arranged in the travel groove. In some embodiments of the present invention, the end of the clamping jaw away from the tooling base is set as an arc structure. In some embodiments of the present invention, a convex structure is provided on the tooling base. The convex structure is arranged in the middle of a plurality of rotary pressing structures. A plurality of airtight hole structures and a plurality of positioning pins are provided on the convex structure, and the heights of the plurality of airtight hole structures are the same. In some embodiments of the present invention, a first gas passage is provided on the connecting block. The first gas passage is communicated with the inner cavity of the hollow main shaft. A second gas passage is provided on the chuck and is communicated with the first gas passage. A third gas passage is provided on the tooling base and is communicated with the second gas passage, and the third gas passage is communicated with the airtight holes. In the second aspect of the present invention, a method for using a clamping tool for machining the inner hole of a lathe is provided, including: Set the spindle pull rod in the inner cavity of the hollow main shaft and connect the connecting block. The connecting block is connected to the chuck. A plurality of rotary pressing structures are arranged on the chuck. Assemble the clamping tool, and make the inner cavity of the hollow main shaft communicate with the airtight hole structure through the first gas passage, the second gas passage and the third gas passage; Control the spindle pull rod to drive the connecting block and the chuck to perform axial movement, so that a plurality of clamping jaws rotate away from the tooling base at the same time. Position the workpiece on the tooling base through a plurality of positioning pins. Control the spindle pull rod to drive the connecting block and the chuck to perform axial movement, so that a plurality of clamping jaws rotate close to the tooling base at the same time to realize clamping of the workpiece. The end face of the workpiece close to the tooling base abuts against a plurality of airtight hole structures; Observe the air leakage condition of a plurality of airtight hole structures, judge and adjust the clamping posture of the workpiece. When none of the plurality of airtight hole structures leaks air, perform inner hole machining on the workpiece; After the machining is completed, control the spindle pull rod to drive the connecting block and the chuck to perform axial movement, so that a plurality of clamping jaws rotate away from the tooling base at the same time, and remove the workpiece from a plurality of positioning pins.

[0005] One or more technical solutions of the present invention have the following beneficial effects: A clamping tooling and its usage method for machining internal holes on a lathe provided by the present invention clamp a workpiece by arranging a plurality of rotary clamping structures on a tooling base at the clamping end of the lathe. The plurality of rotary clamping structures are connected to a ball spindle pull rod arranged inside the lathe spindle through a chuck and a connecting block. When the spindle pull rod moves axially inside the spindle, it drives the plurality of rotary clamping structures to clamp and loosen simultaneously, achieving stable clamping of workpieces with relatively complex structures. The plurality of rotary clamping structures have high operation synchronization, can be used in cooperation with the original structure of the lathe, improve the processing efficiency, ensure the processing accuracy, and simplify the clamping structure at the end of the lathe, facilitating subsequent maintenance and repair; A plurality of airtight hole structures are provided at the clamping end of the lathe, and the plurality of airtight hole structures communicate with the inner cavity of the lathe spindle. After the plurality of rotary clamping structures clamp the workpiece, the surface of the workpiece contacts all the plurality of airtight holes. By ventilating the inner cavity of the lathe spindle, the plurality of airtight hole structures can discharge air simultaneously. At this time, the air discharge conditions of the plurality of airtight hole structures can be judged respectively, so as to help the staff further judge whether the workpiece is clamped in place and whether the clamping posture of the workpiece is correct, ensuring the processing accuracy; When the plurality of rotary clamping structures do not install the workpiece, the state of the clamping jaws can avoid the installation position of the workpiece, facilitating the installation of the workpiece and reducing installation interference. When the workpiece is installed and clamped, the clamping jaws rotate and clamp, enabling the installation and clamping of workpieces with relatively complex structures, avoiding pinching the operators during the installation and clamping process. At the same time, the end of the clamping jaw far from the workpiece is set as an arc structure, which can also avoid interference during workpiece installation. In addition, during the rotation of the clamping jaw, the winding of machining chips can be reduced, reducing the cleaning work of the operator. Description of the Drawings

[0006] Figure 1 It is a front structural schematic diagram of a clamping tooling for machining internal holes on a lathe provided in Embodiment 1 of the present invention; Figure 2 It is a three-dimensional structural schematic diagram of a clamping tooling for machining internal holes on a lathe provided in Embodiment 1 of the present invention; Figure 3 It is a structural schematic diagram of the tooling base of a clamping tooling for machining internal holes on a lathe provided in Embodiment 1 of the present invention; Figure 4 It is an internal connection structural schematic diagram of a clamping tooling for machining internal holes on a lathe provided in Embodiment 1 of the present invention; Figure 5 It is a front sectional view schematic of a clamping tooling for machining internal holes on a lathe provided in Embodiment 1 of the present invention Figure 1 ; Figure 6 It is a front sectional view schematic of a clamping tooling for machining internal holes on a lathe provided in Embodiment 1 of the present inventionFigure 2 ; Figure 7 A cross-sectional schematic diagram of a clamping tool for boring the inner hole of a lathe provided in Embodiment 1 of the present invention Figure 3 ; Figure 8 A schematic diagram of the workpiece structure provided in Embodiment 1 of the present invention

[0007] In the figure: 1, small-diameter hollow spindle; 2, large-diameter hollow spindle; 3, first connection structure; 4, limiting structure; 5, chuck sleeve; 6, protruding structure; 7, clamping jaw; 8, airtight hole structure; 9, positioning pin; 10, connection block; 11, chuck; 12, connection nut; 13, rotary sleeve; 14, rotary shaft; 15, travel groove; 16, cylindrical pin; 17, first gas passage; 18, second gas passage; 19, third gas passage; 20, first connection bolt; 21, second connection bolt; 22, prefabricated hole Detailed implementation manners

[0008] The present invention will be further described below in conjunction with the drawings and embodiments

[0009] Embodiment 1 In a typical implementation manner of the present invention, a clamping tool for boring the inner hole of a lathe is proposed, including a hollow spindle. One end of the hollow spindle is connected to the first connection structure 3. The first connection structure 3 is connected to the limiting structure 4. The limiting structure 4 is connected to the chuck sleeve 5. A tooling base is provided at one end of the chuck sleeve 5 away from the limiting structure 4. A plurality of airtight hole structures 8 are provided on the tooling base. The plurality of airtight hole structures 8 communicate with the inner cavity of the hollow spindle. A connection block 10 is provided inside the limiting structure 4, and a chuck 11 is provided inside the chuck sleeve 5 A spindle pull rod is provided in the inner cavity of the hollow spindle. The spindle pull rod can axially move in the inner cavity of the hollow spindle. One end of the spindle pull rod protrudes from the inner cavity of the hollow spindle and is connected to the connection block 10. The connection block 10 is connected to the chuck 11. One end of the chuck 11 away from the connection block 10 is connected to a plurality of rotary clamping structures. The plurality of rotary clamping structures protrude from the tooling base

[0010] By providing a plurality of rotary clamping structures on the tooling base at the clamping end of the lathe to clamp the workpiece, the plurality of rotary clamping structures are connected to the bead spindle pull rod provided inside the lathe spindle through the chuck 11 and the connection block 10. By the axial movement of the spindle pull rod inside the spindle along the axis of the spindle, the plurality of rotary clamping structures are driven to clamp and release simultaneously, realizing stable clamping of workpieces with relatively complex structures. The plurality of rotary clamping structures have high operation synchronization, can be used in cooperation with the original structure of the lathe, improve the processing efficiency, ensure the processing accuracy, and simplify the clamping structure at the end of the lathe, facilitating subsequent maintenance and repair Furthermore, the hollow spindle includes a small-diameter-section hollow spindle 1 and a large-diameter-section hollow spindle 2. The large-diameter-section hollow spindle 2 is circumferentially provided with a plurality of first connection holes along the axis of the hollow spindle. A plurality of second connection holes are provided on the first connection structure 3. The first connection structure 3 and the large-diameter-section hollow spindle 2 are connected by a plurality of first connection bolts 20 respectively passing through the plurality of first connection holes and the plurality of second connection holes. Furthermore, one end of the limiting structure 4 close to the first connection structure 3 is provided with a groove structure of a certain depth. The first connection structure 3 is clamped with the limiting structure 4 through the groove structure. A plurality of third connection holes are circumferentially provided along the axis of the hollow spindle on the peripheral side of the edge of the limiting structure 4. A plurality of fourth connection holes are provided on the chuck sleeve 5. The limiting structure 4 and the chuck sleeve 5 are connected by a plurality of second connection bolts 21 respectively passing through the plurality of third connection holes and the plurality of fourth connection holes. Furthermore, a through hole is provided along the axis of the hollow spindle in the limiting structure 4. A connection block 10 is provided in the through hole, and the connection block 10 can slide in the through hole; the connection block 10 is provided with an internal thread structure. One end of the spindle pull rod protrudes from the inner cavity of the hollow spindle and is connected with the connection block 10 through the internal thread structure. Furthermore, a plurality of cylindrical holes are provided on the end face of the limiting structure 4 close to one end of the chuck 11. The positions of the cylindrical holes correspond to the positions of the rotary pressing structures provided on the chuck 11. When the plurality of rotary pressing structures move axially along the hollow spindle, they can respectively enter and exit the plurality of cylindrical holes. Such a setting can make the overall structure of the tooling more compact. Furthermore, the rotary pressing structure includes a rotary sleeve 13, a rotary shaft 14, a connection nut 12 and a clamping jaw 7. One end of the rotary shaft 14 passes through the chuck 11 and is connected by a connection nut 12 at one end of the chuck 11 close to the limiting block. The other end of the rotary shaft 14 passes through the tooling base and is connected to the clamping jaw 7. The rotary sleeve 13 is arranged outside the rotary shaft 14 between the chuck 11 and the tooling base; a travel groove 15 is provided on the rotary sleeve 13, and a cylindrical pin 16 is provided on the rotary shaft 14. The cylindrical pin 16 is arranged in the travel groove 15. By limiting the cylindrical pin 16 through the travel groove 15, when the rotary shaft 14 slides in the rotary sleeve 13, the clamping jaw 7 can be rotated by a certain angle to realize the rotary pressing of the workpiece.

[0011] Furthermore, the end of the clamping jaw 7 away from the tooling base is set as an arc structure.

[0012] When multiple rotary clamping structures are not loaded with workpieces, the state of the clamping jaws 7 can avoid the installation position of the workpieces, facilitating the installation of the workpieces, reducing installation interference. When the workpieces are installed and clamped, the clamping jaws 7 rotate and clamp, enabling the installation and clamping of workpieces with relatively complex structures, avoiding injury to operators during the installation and clamping process. At the same time, the end of the clamping jaw 7 away from the workpiece is provided with an arc structure, which can also avoid interference during workpiece installation. In addition, during the rotation of the clamping jaw 7, the winding of machining iron chips can be reduced, lightening the cleaning work of the operator. Furthermore, a convex structure 6 is provided on the tooling base. The convex structure 6 is arranged in the middle of multiple rotary pressing structures. Multiple airtight hole structures 8 and multiple positioning pins 9 are provided on the convex structure 6. The heights of the multiple airtight hole structures 8 are the same. Furthermore, a first gas passage 17 is provided on the connecting block 10. The first gas passage 17 communicates with the inner cavity of the hollow spindle. A second gas passage 18 is provided on the chuck 11 and communicates with the first gas passage 17. A third gas passage 19 is provided on the tooling base and communicates with the second gas passage 18. The third gas passage 19 communicates with the airtight holes.

[0013] Multiple airtight hole structures 8 are provided at the clamping end of the lathe. The multiple airtight hole structures 8 communicate with the inner cavity of the lathe spindle. After the multiple rotary clamping structures clamp the workpiece, the surface of the workpiece contacts all the airtight holes. By ventilating the inner cavity of the lathe spindle, the multiple airtight hole structures 8 can simultaneously emit gas. At this time, the air emission conditions of the multiple airtight hole structures 8 can be respectively judged, thereby helping the staff to further judge whether the workpiece clamping is in place and whether the clamping posture of the workpiece is correct, ensuring the machining accuracy. In the second aspect of the present invention, a method for using a clamping tool for machining the inner hole of a lathe is provided, including: Set the spindle pull rod in the inner cavity of the hollow spindle and connect the connecting block 10. The connecting block 10 connects the chuck 11. Multiple rotary pressing structures are arranged on the chuck 11. Assemble the clamping tool, and make the inner cavity of the hollow spindle communicate with the airtight hole structure 8 through the first gas passage 17, the second gas passage 18, and the third gas passage 19; Control the spindle pull rod to drive the connecting block 10 and the chuck 11 to move axially, so that the multiple clamping jaws 7 rotate away from the tooling base simultaneously. Position the workpiece on the tooling base through the multiple positioning pins 9. The workpiece is provided with a prefabricated hole 22 that cooperates with the multiple positioning pins 9. Control the spindle pull rod to drive the connecting block 10 and the chuck 11 to move axially, so that the multiple clamping jaws 7 rotate close to the tooling base simultaneously to realize the pressing of the workpiece. The end face of the workpiece close to the tooling base abuts against the multiple airtight hole structures 8; Observe the air leakage conditions of the multiple airtight hole structures 8, judge and adjust the clamping posture of the workpiece. When none of the multiple airtight hole structures 8 leaks air, machine the inner hole of the workpiece; After processing is completed, the main shaft pull rod is controlled to drive the connecting block 10 and the chuck 11 to perform axial movement, so that multiple clamping jaws 7 rotate away from the tooling base simultaneously, and the workpiece is removed from multiple positioning pins 9.

[0014] Although the specific implementation manners of the present invention are described above in conjunction with the accompanying drawings, they are not limitations on the protection scope of the present invention. Those skilled in the art should understand that various modifications or deformations that can be made without creative efforts on the basis of the technical solution of the present invention are still within the protection scope of the present invention.

Claims

1. A clamping tool for lathe inner hole, characterized in that: It comprises a hollow main shaft, one end of the hollow main shaft is connected to a first connecting structure, the first connecting structure is connected to a limiting structure, the limiting structure is connected to a chuck sleeve, one end of the chuck sleeve away from the limiting structure is provided with a tooling base, the tooling base is provided with a plurality of airtight hole structures, the plurality of airtight hole structures are communicated with the inner cavity of the hollow main shaft; a connecting block is provided inside the limiting structure, and a chuck is provided inside the chuck sleeve; The inner cavity of the hollow spindle is provided with a spindle pull rod, and the spindle pull rod can move axially in the inner cavity of the hollow spindle. One end of the spindle pull rod protrudes from the inner cavity of the hollow spindle and is connected to a connecting block. The connecting block is connected to a chuck. The end of the chuck away from the connecting block is connected to a plurality of rotary clamping structures. The plurality of rotary clamping structures are protruding from the tooling base.

2. A clamping tool for lathe inner hole according to claim 1, characterized in that: The hollow main shaft includes a small diameter section hollow main shaft and a large diameter section hollow main shaft. The large diameter section hollow main shaft is provided with a plurality of first connecting holes in a circumferential direction along the axis of the hollow main shaft. The first connecting structure is provided with a plurality of second connecting holes. The first connecting structure is connected to the large diameter section hollow main shaft by a plurality of first connecting bolts passing through the plurality of first connecting holes and the plurality of second connecting holes respectively.

3. A clamping tool for lathe inner hole according to claim 1, characterized in that: A groove structure of a certain depth is provided at one end of the limiting structure close to the first connecting structure, and the first connecting structure is clamped with the limiting structure through the groove structure; A plurality of third connecting holes are arranged in a circumferential direction along the axis of the hollow main shaft on the edge circumference of the limiting structure, and a plurality of fourth connecting holes are arranged on the chuck sleeve. The limiting structure and the chuck sleeve are connected by a plurality of second connecting bolts passing through the plurality of third connecting holes and the plurality of fourth connecting holes respectively.

4. A clamping tool for turning inner holes on a lathe as claimed in claim 1, characterized in that: The limiting structure is provided with a through hole along the axis of the hollow main shaft, and a connecting block is provided in the through hole, and the connecting block can slide in the through hole; the connecting block is provided with an internal thread structure, and one end of the main shaft pull rod protrudes from the inner cavity of the hollow main shaft and is connected to the connecting block through the internal thread structure.

5. The clamping tool for turning inner holes on a lathe according to claim 1, characterized in that: The limiting structure is provided with a plurality of cylindrical holes on the end surface close to one end of the chuck, and the positions of the cylindrical holes correspond to the positions of the rotary clamping structures provided on the chuck. The plurality of rotary clamping structures can respectively enter and exit the plurality of cylindrical holes when making axial movement along the hollow main shaft.

6. A clamping tool for turning inner holes on a lathe as claimed in claim 1, characterized in that: The rotary pressing structure comprises a rotary sleeve, a rotary shaft, a connecting nut and a pressing claw; One end of the rotating shaft passes through the chuck and is connected to the chuck at the end close to the limit block through a connecting nut, and the other end of the rotating shaft passes through the tooling base to connect with the pressure claw, and the rotating sleeve is arranged outside the rotating shaft between the chuck and the tooling base; the rotating sleeve is provided with a travel groove, and the rotating shaft is provided with a cylindrical pin, and the cylindrical pin is arranged in the travel groove.

7. A clamping tool for turning inner holes on a lathe as claimed in claim 6, characterized in that: The end of the pressing claw away from the tooling base is arranged in an arc structure.

8. The clamping tool for turning inner holes on a lathe according to claim 1, characterized in that: The tooling base is provided with a protruding structure, which is arranged in the middle of a plurality of rotary pressing structures. The protruding structure is provided with a plurality of airtight hole structures and a plurality of positioning pins, and the heights of the plurality of airtight hole structures are consistent.

9. The clamping tool for turning inner holes on a lathe according to claim 1, characterized in that: The connecting block is provided with a first gas passage, which is connected to the inner cavity of the hollow main shaft. The chuck is provided with a second gas passage connected to the first gas passage. The tooling base is provided with a third gas passage connected to the second gas passage, and the third gas passage is connected to the airtight hole.

10. A method for using a clamping tool for turning inner holes on a lathe according to any one of claims 1 to 9, characterized in that: include: The spindle pull rod is arranged in the inner cavity of the hollow spindle and connected to the connecting block, the connecting block is connected to the chuck, and the chuck is provided with a plurality of rotary pressing structures, and the clamping tool is assembled so that the inner cavity of the hollow spindle is connected to the airtight hole structure through the first gas passage, the second gas passage and the third gas passage; The spindle pull rod is controlled to drive the connection block and the chuck to move axially, so that the multiple pressing claws rotate away from the tooling base at the same time, and the workpiece is positioned on the tooling base through multiple positioning pins. The spindle pull rod is controlled to drive the connection block and the chuck to move axially, so that the multiple pressing claws rotate close to the tooling base at the same time to achieve the clamping of the workpiece, and the end face of the workpiece close to the tooling base abuts against the multiple airtight hole structures; Observe the leakage of multiple airtight hole structures, judge and adjust the clamping posture of the workpiece, and when multiple airtight hole structures are leak-free, perform inner hole machining on the workpiece; After the processing is completed, the spindle pull rod is controlled to drive the connecting block and the chuck to move axially, so that the multiple pressure claws rotate away from the tooling base at the same time, and the workpiece is removed from the multiple positioning pins.

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