A self-compensating turning tool holder system for slender shaft and thin-walled precision turning

Abstract

The application discloses a self-compensation lathe tool holder system for slender shaft and thin-wall precision turning, relates to the technical field of tools and precision manufacturing, and comprises a lathe tool holder body, an external circle machining module, an internal hole machining module, a workpiece state monitoring module and a closed-loop control module; the bottom of the external circle machining module and the internal hole machining module is provided with an external circle module wear-prevention reserved structure and an internal hole module wear-prevention reserved structure, and the external circle machining module and the internal hole machining module are integrated on the lathe tool holder body.

Description

Technical Field

[0001] This invention relates to the field of cutting tools and precision manufacturing technology, and in particular to a self-compensating turning tool holder system for precision turning of slender shafts and thin walls. Background Technology

[0002] In high-end manufacturing fields such as aerospace, precision machinery, and medical devices, there are a large number of thin-walled, slender shaft-type key core components. These components are characterized by thin walls, large length-to-diameter ratios, and poor structural rigidity. During conventional turning processes, they are easily subjected to cutting forces, resulting in workpiece elastic deformation and cutting chatter. At the same time, continuous tool wear directly changes the actual position of the tool tip, ultimately leading to the inability to meet the dimensional and geometric tolerances of the parts, resulting in low yield and poor consistency. This has become a core industry pain point restricting the precision machining of such parts.

[0003] In existing technologies, conventional lathe tool holders are mostly fixed rigid structures that only have the function of tool clamping. They cannot provide real-time online compensation for tool wear, nor can they suppress vibration and workpiece deformation during the cutting process. They are not suitable for the high-precision machining requirements of thin-walled and slender shaft parts. Some dedicated tool holders with compensation functions mostly use a single sensor for machining status monitoring, which can only collect cutting force or displacement data in a single dimension. At the same time, existing compensation tool holders are mostly designed for single machining scenarios of internal holes or external circles, and cannot achieve flexible switching between internal hole and external circle composite machining. They have poor versatility, and multiple machining operations require frequent tool holder changes, which reduces machining efficiency. In addition, during long-term reciprocating compensation operations, the bottom of the existing compensation tool holder is prone to friction and wear with the contact surface of the lathe turret. After long-term use, this will reduce the installation accuracy and compensation accuracy of the tool holder, and shorten the service life of the tool holder.

[0004] Therefore, for precision turning of slender shafts and thin-walled, low-rigidity workpieces, it is difficult to simultaneously solve the comprehensive machining errors caused by tool wear, workpiece elastic deformation, and cutting vibration by relying solely on a fixed tool post or a single displacement compensation mechanism. Summary of the Invention

[0005] The purpose of this invention is to provide a self-compensating turning tool holder system for precision turning of slender shafts and thin-walled parts, in order to solve the problem that existing turning tool holders are unable to simultaneously sense tool wear, cutting force changes, workpiece vibration and workpiece elastic deformation when machining thin-walled parts and slender shafts with low rigidity, and cannot achieve integrated real-time compensation for internal hole machining and external diameter machining.

[0006] This invention provides a self-compensating turning tool holder system for precision turning of slender shafts and thin-walled structures. The system includes a tool holder body, an external cylindrical machining module, an internal machining module, a workpiece status monitoring module, a closed-loop control module, and fastening bolts. The bottom of the external cylindrical machining module and the internal machining module are respectively provided with anti-wear reserved structures for the external cylindrical module and the internal machining module. The inner side of the anti-wear reserved structure for the internal machining module has a tool clamping clearance. Both the external cylindrical machining module and the internal machining module are integrated onto the tool holder body. The external cylindrical machining module includes several integrally formed flexible turning plates, a first eddy current sensor, a first pressure sensor, and a first piezoelectric ceramic actuator. The flexible turning plates are located between the tool holder body and the external cylindrical machining module. Between the blocks, the internal hole machining module includes a U-shaped flexible hinge, a second pressure sensor, a second piezoelectric ceramic actuator, and a second eddy current sensor. The U-shaped flexible hinge connects the tool holder body and the internal hole machining module and is fixed to the tool holder body. The second piezoelectric ceramic actuator is embedded in the connection gap between the U-shaped flexible hinge and the tool holder body. The workpiece status monitoring module includes a horizontal beam, a vertical plate, and a third eddy current sensor. The third eddy current sensor is mounted on the vertical plate. The closed-loop control module is connected to the first piezoelectric ceramic actuator, the first eddy current sensor, the first pressure sensor, the second piezoelectric ceramic actuator, the second eddy current sensor, the second pressure sensor, and the third eddy current sensor, respectively.

[0007] Preferably, the transverse beam is detachably connected to the tool holder body, and the vertical plate is detachably connected to the transverse beam.

[0008] Preferably, the tool post body is provided with a central fixing hole.

[0009] Preferably, the root of the Z-shaped flexible hinge is integrally extended to form a turning inner hole flexible hinge, and the Z-shaped flexible hinge, the turning inner hole flexible hinge and the tool holder body are integrally machined; the turning inner hole flexible hinge is an end extension structure of the Z-shaped flexible hinge towards the inner hole machining module.

[0010] Preferably, the machined outer cylindrical flexible sheet is integrally formed from several sets of parallel flexible spring sheets.

[0011] Preferably, the third eddy current sensor is fixed on the vertical plate.

[0012] Preferably, the turning outer circle flexible sheet and the zigzag flexible hinge are fixedly connected to the outer circle machining module and the inner hole machining module, respectively.

[0013] Preferably, the closed-loop control module includes a data fusion unit, a compensation calculation unit, and a drive control unit, wherein the data fusion unit and the compensation calculation unit are electrically connected, and the compensation calculation unit and the drive control unit are electrically connected.

[0014] Preferably, the outer diameter machining module is equipped with an outer diameter turning tool and an outer diameter turning insert, and the inner diameter machining module is equipped with an inner diameter turning tool in the tool clamping gap.

[0015] Therefore, the present invention adopts the above-mentioned self-compensating turning tool holder system for precision turning of slender shafts and thin walls to solve the problem that existing turning tool holders are difficult to simultaneously sense tool wear, cutting force changes, workpiece vibration and workpiece elastic deformation when machining thin-walled parts and slender shafts with low rigidity, and cannot achieve integrated real-time compensation for internal hole machining and external circle machining.

[0016] The technical solution of the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. Attached Figure Description

[0017] Figure 1 This is a schematic front view of a self-compensating tool holder system for precision turning of slender shafts and thin walls according to the present invention. Figure 2 This is a schematic diagram of the main structure of the self-compensating turning tool holder system for precision turning of slender shafts and thin walls according to the present invention for machining the outer circle; Figure 3 This is a schematic diagram of the main structure of the self-compensating turning tool holder system for precision turning of slender shafts and thin walls according to the present invention for machining internal holes; Figure 4 This is a first-view three-dimensional structural diagram of a self-compensating turning tool holder system for precision turning of slender shafts and thin walls according to the present invention. Figure 5 This is a second-view three-dimensional structural diagram of a self-compensating turning tool holder system for precision turning of slender shafts and thin walls according to the present invention. Figure 6 This is a third-view three-dimensional structural diagram of a self-compensating turning tool holder system for precision turning of slender shafts and thin walls according to the present invention. Figure 7 This is a fourth-view three-dimensional structural diagram of a self-compensating tool holder system for precision turning of slender shafts and thin walls according to the present invention.

[0018] Figure Labels 1. Tool holder body; 2. Flexible hinge for turning the inner hole; 3. Fastening bolt; 4. Z-shaped flexible hinge; 5. Central fixing hole; 6. Flexible sheet for turning the outer circle; 7. First eddy current sensor; 8. First pressure sensor; 9. First piezoelectric ceramic actuator; 10. Tool clamping clearance; 11. Transverse beam; 12. Third eddy current sensor; 13. Wear-resistant reserved structure for the inner hole module; 14. Wear-resistant reserved structure for the outer circle module; 15. Vertical plate; 16. Workpiece; 17. Outer circle turning tool; 18. Outer circle turning insert; 19. Inner hole turning tool; 20. Second pressure sensor; 21. Second piezoelectric ceramic actuator; 22. Second eddy current sensor. Detailed Implementation

[0019] The technical solution of the present invention will be further described below with reference to the accompanying drawings and embodiments.

[0020] Unless otherwise defined, the technical or scientific terms used in this invention shall have the ordinary meaning as understood by one of ordinary skill in the art to which this invention pertains.

[0021] The terms "first," "second," "third," and similar terms used in this invention do not indicate any order, quantity, or importance, but are merely used to distinguish different components. Terms such as "comprising" or "including" mean that the element or object preceding the term encompasses the elements or objects listed after the term and their equivalents, without excluding other elements or objects. Terms such as "connected" or "linked" are not limited to physical or mechanical connections, but can include electrical connections, whether direct or indirect. Terms such as "upper," "lower," "left," and "right" are used only to indicate relative positional relationships; when the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0022] Example 1 like Figures 1-7 As shown, the present invention provides a self-compensating turning tool holder system for precision turning of slender shafts and thin walls, including a turning tool holder body 1, an outer diameter machining module, an inner diameter machining module, a workpiece status monitoring module, a closed-loop control module, and fastening bolts 3. The turning tool holder body 1 is provided with a central fixing hole 5, and the fastening bolts 3 are used for assembling, locking, and fixing the position of each component.

[0023] The bottom of the outer circle machining module and the inner hole machining module are respectively provided with an outer circle module anti-wear reserved structure 14 and an inner hole module anti-wear reserved structure 13 to avoid wear of the tool holder body 1 during displacement compensation. The inner hole module anti-wear reserved structure 13 is provided with a tool clamping gap 10. The tool clamping gap 10 of the inner hole machining module is equipped with an inner hole tool 19 to realize the quick clamping and positioning of the inner hole tool.

[0024] Both the external diameter machining module and the internal diameter machining module are integrated on the tool holder body 1, and adopt a modular independent design, which can switch between external diameter turning or internal diameter turning mode according to machining needs.

[0025] The external cylindrical machining module includes several integrally formed flexible turning plates 6, a first eddy current sensor 7, a first pressure sensor 8, and a first piezoelectric ceramic actuator 9. The flexible turning plates 6 are located between the tool holder body 1 and the external cylindrical machining module. The external cylindrical machining module is equipped with an external cylindrical turning tool 17 and an external cylindrical turning insert 18. When the flexible turning plates 6 undergo elastic deformation, the external cylindrical turning tool 17 and the external cylindrical turning insert 18 can be driven to complete the feed compensation as a whole.

[0026] The flexible sheet 6 for turning the outer diameter is integrally formed with several sets of parallel flexible springs. These sets of parallel flexible springs are equidistantly arranged along the feed direction of the cutting tool to constrain the displacement of the compensation direction of the outer diameter machining module and improve the motion guidance accuracy during the micro-displacement compensation process of the cutting tool.

[0027] The internal machining module includes a U-shaped flexible hinge 4, a second pressure sensor 20, a second piezoelectric ceramic actuator 21, and a second eddy current sensor 22. The U-shaped flexible hinge 4 connects the tool holder body 1 and the internal machining module, and is fixedly connected to the tool holder body 1. An internal turning flexible hinge 2 is integrally formed at the root of the U-shaped flexible hinge 4. The U-shaped flexible hinge 4, the internal turning flexible hinge 2, and the tool holder body 1 are integrally machined. The internal turning flexible hinge 2 is an end extension of the U-shaped flexible hinge 4 towards the internal machining module. It is used to constrain the deformation direction when driven by the second piezoelectric ceramic actuator 21, retaining only the radial and axial degrees of freedom required for tool position compensation.

[0028] The second piezoelectric ceramic actuator 21 is embedded in the gap between the U-shaped flexible hinge 4 and the tool holder body 1. The second eddy current sensor 22 is used to collect the tool displacement compensation amount. The second pressure sensor 20 is used to collect the cutting force data in real time during the internal hole turning process.

[0029] The moving end of the turning outer circle flexible sheet 6 and the moving end of the zigzag flexible hinge 4 are fixedly connected to the outer circle machining module and the inner hole machining module, respectively. As the corresponding flexible structure deforms, the turning tool is driven to complete displacement compensation.

[0030] The first piezoelectric ceramic actuator 9 is embedded in the outer diameter machining module of the tool holder body 1 and the first pressure sensor 8. The first pressure sensor 8 is used to collect cutting force data in real time during the outer diameter turning process, and the first eddy current sensor 7 is used to collect the tool displacement compensation amount in real time during the outer diameter turning process.

[0031] The workpiece status monitoring module includes a replaceable length transverse beam 11, a third eddy current sensor 12, and a replaceable height vertical plate 15. The replaceable length transverse beam 11 is matched with the tool holder body 1 and is detachably connected to the tool holder body 1. The vertical plate 15 is detachably connected to the transverse beam 11. By replacing the transverse beam 11 with different length specifications, the monitoring distance between the third eddy current sensor 12 and the workpiece 16 can be adjusted. The vertical plate 15 of different heights can be assembled as needed, and different vertical plates 15 can be replaced to adapt to workpieces 16 with different diameters and lengths.

[0032] The third eddy current sensor 12 is fixed to the vertical plate 15 by a locking member. The installation position can be adjusted according to the size of the workpiece 16 to be processed, and it is used to collect the vibration and radial deformation of the workpiece 16 in real time.

[0033] The closed-loop control module is connected to the first piezoelectric ceramic actuator 9, the second piezoelectric ceramic actuator 21, the first eddy current sensor 7, the second eddy current sensor 22, the third eddy current sensor 12, the first pressure sensor 8, and the second pressure sensor 20, respectively. It is used to receive full-dimensional processing status data collected by multiple sensors. After data fusion and compensation calculation, it drives the piezoelectric ceramic actuator at the corresponding position to drive the flexible structure to generate micron-level deformation, thereby realizing real-time closed-loop compensation of the tool position.

[0034] The closed-loop control module includes a data fusion unit, a compensation calculation unit, and a drive control unit. The data fusion unit is electrically connected to the compensation calculation unit, and the compensation calculation unit is electrically connected to the drive control unit. The data fusion unit is used to fuse cutting force data collected by the first pressure sensor 8 or the second pressure sensor 20, tool displacement data collected by the first eddy current sensor 7 or the second eddy current sensor 22, and workpiece vibration and radial deformation data collected by the third eddy current sensor 12. The data fusion unit performs multi-source data fusion and feature extraction on the cutting force, tool wear, tool displacement, and workpiece vibration and deformation data collected by multiple sensors. The compensation calculation unit calculates the corresponding tool position compensation amount based on the fused machining state data and the preset machining accuracy requirements.

[0035] The compensation calculation unit is used to calculate the target compensation displacement of the external turning tool 17 or the internal turning tool 19 based on the machining status data after fusion processing. The drive control unit is used to output a drive signal to the first piezoelectric ceramic actuator 9 or the second piezoelectric ceramic actuator 21 based on the target compensation displacement. The drive control unit is used to output a drive signal to the piezoelectric ceramic actuator at the corresponding position based on the compensation amount. After the tool position adjustment is completed, the compensation accuracy is verified by secondary acquisition through the corresponding eddy current sensor, forming a full closed-loop control.

[0036] After the piezoelectric ceramic actuator completes one tool position compensation, the closed-loop control module collects the actual displacement of the corresponding cutting tool again through the first eddy current sensor 7 or the second eddy current sensor 22. When the deviation between the actual displacement and the target compensation displacement is greater than the preset threshold, the closed-loop control module drives the corresponding piezoelectric ceramic actuator again to perform secondary compensation.

[0037] The piezoelectric ceramic actuators, eddy current sensors, and pressure sensors used in the outer diameter machining module and the inner diameter machining module are all functional devices, differing only in their installation location, monitoring objects, and models.

[0038] A working method for a self-compensating turning tool holder system for precision turning of slender shafts and thin-walled parts includes the following steps: Step S1, system initialization and pre-machining preparation; complete the calibration of all eddy current sensors and pressure sensors; based on the type of the workpiece 16 to be processed, which is a slender shaft or a thin-walled part, based on the machining mode of the workpiece 16 to be processed, which is external turning or internal turning, and based on the target machining accuracy of the workpiece 16 to be processed, complete the machining parameter configuration; adjust the position of the third eddy current sensor 12 connected to the interchangeable length transverse beam 11 and interchangeable height vertical plate 15 in the workpiece status monitoring module, so that they are aligned with the monitoring area of ​​the workpiece 16 to be processed.

[0039] Step S2: Real-time machining status acquisition; During the turning process, cutting force data is acquired in real time through the pressure sensor corresponding to the machining mode, tool displacement data is acquired in real time through the eddy current sensor at the corresponding position, the installation position of the third eddy current sensor 12 is adjusted by changing the vertical plate 15 of different heights, vibration and radial deformation data of the workpiece 16 are acquired in real time, and all acquired data are transmitted to the closed-loop control module in real time.

[0040] Step S3: Data Fusion and Compensation Decision; The closed-loop control module fuses and extracts features from the collected multi-source data, analyzes the characteristics of cutting force changes, calculates tool wear, workpiece deformation, and vibration amplitude, and determines whether tool position compensation is needed. If no compensation is needed, the current machining state is maintained; if compensation is needed, the corresponding tool position compensation amount is calculated based on the combined effects of wear, deformation, and vibration.

[0041] In step S3, the multi-source machining state data received by the closed-loop control module includes cutting force data F, actual tool displacement s, tool tip position change w caused by tool wear, radial elastic deformation d of the slender shaft or thin wall of workpiece 16 under the action of cutting force, and the influence v of workpiece 16 vibration on the instantaneous machining position. In the external cylindrical machining mode, the cutting force data F is collected by the first pressure sensor 8, the actual tool displacement s and the tool tip position change w caused by tool wear are collected by the first eddy current sensor 7, and the radial elastic deformation d of the slender shaft or thin wall of workpiece 16 under the action of cutting force and the influence v of workpiece 16 vibration on the instantaneous machining position are collected by the third eddy current sensor 12.

[0042] In the internal machining mode, the cutting force data F is collected by the second pressure sensor 20, the actual tool displacement s and the tool tip position change w caused by tool wear are collected by the second eddy current sensor 22, and the radial elastic deformation d of the slender shaft or thin wall of workpiece 16 under the action of cutting force and the influence v of the vibration of workpiece 16 on the instantaneous machining position are collected by the third eddy current sensor 12. The compensation calculation unit calculates the target compensation displacement Δs based on the deviation between the theoretical tool position s0 corresponding to the target machining dimension and the actual tool displacement s, combined with the tool tip position change w caused by tool wear, the radial elastic deformation d of the slender shaft or thin wall of workpiece 16 under the action of cutting force, the influence v of the vibration of workpiece 16 on the instantaneous machining position, and the change in cutting force relative to the stable machining state ΔF. The target compensation displacement Δs can be obtained using a preset compensation model, a calibration lookup table model, or a proportional correction model.

[0043] The target compensation displacement Δs is calculated according to the following formula: △s=K1(s0-s)+K2w+K3d+K4v+K5△F.

[0044] Wherein, K1, K2, K3, K4, and K5 are compensation coefficients obtained by pre-calibration based on the rigidity of the tool holder structure, the displacement output characteristics of the piezoelectric ceramic actuator, the material of workpiece 16, and the machining parameters; s0-s is the displacement deviation between the theoretical tool position and the actual tool position; w is the change in tool tip position caused by tool wear; d is the radial elastic deformation of slender shafts or thin walls under the action of cutting force; v is the influence of workpiece 16 vibration on the instantaneous machining position; and ΔF is the change in cutting force relative to the stable machining state.

[0045] When the absolute value of the target compensation displacement Δs is less than the preset compensation threshold, the closed-loop control module determines that the current processing error is within the allowable range and does not output a compensation drive signal; when the absolute value of the target compensation displacement Δs is greater than or equal to the preset compensation threshold, the drive control unit converts the target compensation displacement Δs into the corresponding drive voltage U according to the displacement-voltage calibration relationship of the piezoelectric ceramic actuator, and outputs the drive voltage U to the corresponding piezoelectric ceramic actuator.

[0046] In external diameter machining mode, the driving voltage U is output to the first piezoelectric ceramic actuator 9, causing the flexible outer diameter sheet 6 to undergo elastic deformation and driving the external diameter cutting tool 17 to perform micro-displacement compensation. In internal diameter machining mode, the driving voltage U is output to the second piezoelectric ceramic actuator 21, causing the U-shaped flexible hinge 4 to undergo elastic deformation and driving the internal diameter cutting tool 19 to perform micro-displacement compensation.

[0047] After completing one compensation step, the closed-loop control module again acquires the actual tool displacement s1 after compensation through the corresponding eddy current sensor and calculates the compensation residual e = s0 - s1. When the compensation residual e is less than the preset allowable error, the closed-loop control module determines that the compensation is complete; when the compensation residual e is greater than or equal to the preset allowable error, the closed-loop control module recalculates the correction compensation amount based on the compensation residual e and outputs the drive signal to the corresponding piezoelectric ceramic actuator again until the compensation residual meets the machining accuracy requirements.

[0048] Step S4: Closed-loop compensation execution and verification; The closed-loop control module outputs a drive signal to the corresponding piezoelectric ceramic actuator based on the calculated compensation amount. In the outer diameter machining mode, it drives the turning of the outer diameter flexible sheet 6 to produce deformation; in the inner hole machining mode, it drives the Z-shaped flexible hinge 4 to produce deformation, thereby driving the cutting tool to complete the radial / axial micron-level tool position adjustment. After the adjustment is completed, the tool displacement data is collected a second time through the corresponding eddy current sensor to verify the compensation accuracy. If the compensation accuracy does not meet the requirements, secondary compensation is performed until the machining accuracy requirements are met.

[0049] Step S5: Reset after machining; After machining is completed, stop cutting, reset the cutting parameters to zero, drive all piezoelectric ceramic actuators to reset, and return the tool position to the reference position.

[0050] Therefore, the present invention employs a self-compensating turning tool holder system for precision turning of slender shafts and thin-walled parts, as described above. By integrating an external turning module and an internal turning module on the same tool holder body, the external turning tool and the internal turning tool are respectively compensated for micro-displacement by corresponding piezoelectric ceramic actuators and flexible guiding structures. Simultaneously, multi-source state information during the machining process is acquired through pressure sensors, eddy current sensors, and workpiece state monitoring modules. After the closed-loop control module calculates the compensation amount, it drives the corresponding piezoelectric ceramic actuator to perform tool position compensation. After compensation, the eddy current sensor performs feedback correction, thereby improving the dimensional accuracy, machining stability, and tool holder versatility during the precision turning of slender shafts and thin-walled parts.

[0051] The above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit it. Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can still be made to the technical solutions of the present invention, and these modifications or equivalent substitutions cannot cause the modified technical solutions to deviate from the spirit and scope of the technical solutions of the present invention.

Claims

1. A self-compensating tool post system for precision turning of slender shafts and thin-walled structures, characterized in that, The system includes a tool post body, an external diameter machining module, an internal diameter machining module, a workpiece status monitoring module, a closed-loop control module, and fastening bolts. The bottom of the external diameter machining module and the internal diameter machining module are respectively equipped with anti-wear reserved structures for the external diameter module and the internal diameter module. The inner side of the anti-wear reserved structure for the internal diameter module has a tool clamping clearance. Both the external diameter machining module and the internal diameter machining module are integrated onto the tool post body. The external diameter machining module includes several sets of integrally formed flexible turning plates, a first eddy current sensor, a first pressure sensor, and a first piezoelectric ceramic actuator. The flexible turning plates are located between the tool post body and the external diameter machining module. The internal diameter machining module includes a Z-shaped flexible... The system includes a first piezoelectric ceramic actuator, a second pressure sensor, a second piezoelectric ceramic actuator, and a second eddy current sensor. A U-shaped flexible hinge connects the tool holder body and the internal machining module, and the U-shaped flexible hinge is fixed to the tool holder body. The second piezoelectric ceramic actuator is embedded in the connection gap between the U-shaped flexible hinge and the tool holder body. The workpiece status monitoring module includes a horizontal beam, a vertical plate, and a third eddy current sensor, which is mounted on the vertical plate. The closed-loop control module is connected to the first piezoelectric ceramic actuator, the first eddy current sensor, the first pressure sensor, the second piezoelectric ceramic actuator, the second eddy current sensor, the second pressure sensor, and the third eddy current sensor, respectively.

2. A self-compensating tool post system for precision turning of slender shafts and thin walls according to claim 1, characterized in that, The transverse beam is detachably connected to the main body of the tool holder, and the vertical plate is detachably connected to the transverse beam.

3. A self-compensating tool post system for precision turning of slender shafts and thin walls according to claim 2, characterized in that, The tool post body is provided with a central fixing hole.

4. A self-compensating tool post system for precision turning of slender shafts and thin walls according to claim 3, characterized in that, The root of the Z-shaped flexible hinge is integrally extended to form a turning inner hole flexible hinge. The Z-shaped flexible hinge, the turning inner hole flexible hinge and the tool holder body are integrally machined. The turning inner hole flexible hinge is an end structure of the Z-shaped flexible hinge extending toward the inner hole machining module.

5. A self-compensating tool post system for precision turning of slender shafts and thin walls according to claim 4, characterized in that, The machined outer diameter flexible sheet is integrally formed using several sets of parallel flexible spring sheets.

6. A self-compensating tool post system for precision turning of slender shafts and thin walls according to claim 5, characterized in that, The third eddy current sensor is fixed on the vertical plate.

7. A self-compensating tool post system for precision turning of slender shafts and thin walls according to claim 6, characterized in that, The turning outer circle flexible sheet and the zigzag flexible hinge are fixedly connected to the outer circle machining module and the inner hole machining module, respectively.

8. A self-compensating tool post system for precision turning of slender shafts and thin walls according to claim 7, characterized in that, The closed-loop control module includes a data fusion unit, a compensation calculation unit, and a drive control unit. The data fusion unit and the compensation calculation unit are electrically connected, and the compensation calculation unit and the drive control unit are electrically connected.

9. A self-compensating tool post system for precision turning of slender shafts and thin walls according to claim 8, characterized in that, The external turning module is equipped with an external turning tool and an external turning insert, while the internal turning module is equipped with an internal turning tool in the tool clamping gap.

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