Large-length-diameter-ratio tool and intelligent damping device thereof

Abstract

The intelligent damping device comprises a base, a piezoelectric laminated beam, a bearing, a bearing sleeve, an outer sleeve, an inner sleeve and a vibration isolation net, the inner sleeve, the vibration isolation net and the cutter are coaxially arranged, the vibration isolation net is located between the cutter and the inner sleeve, the bearing is arranged on the cutter in a sleeving mode, the bearing sleeve is arranged on the outer side of the bearing, and the piezoelectric laminated beam is arranged on the outer side of the bearing. The outer sleeve and the cutter are coaxially arranged, one end of the outer sleeve is connected with the base, the other end of the outer sleeve is suspended, and the multiple piezoelectric laminated beams are evenly arranged in the circumferential direction of the cutter. One end of the piezoelectric laminated beam is connected with the base, and the other end is connected with the bearing sleeve; the inner sleeve is connected with the handle; a piezoelectric layer capable of outputting acting force is arranged in the piezoelectric laminated beam, the outer sleeve is a rigid sleeve, and the piezoelectric laminated beam is connected with a piezoelectric actuator. Vibration reduction is conducted in the mode that active vibration suppression and passive vibration isolation are combined, and compared with a single passive vibration reduction or active vibration suppression mode, the vibration reduction effect is better improved, and the cutting stability is improved.

Description

Technical Field

[0001] This invention belongs to the field of vibration reduction technology for machining tools, specifically relating to a large length-to-diameter ratio cutting tool and its intelligent vibration reduction device. Background Technology

[0002] Machining complex thin-walled parts is a challenging task in the field of mechanical manufacturing. These parts are characterized by their complex structures, high precision requirements, and often utilize novel materials, leading to cutting difficulties. Machining large-sized, complex thin-walled structures often necessitates the use of tools with low stiffness and a large length-to-diameter ratio. For tools with a large length-to-diameter ratio, the low natural frequency and weak damping characteristics make them more prone to instability during cutting, significantly reducing the chatter threshold and easily generating self-excited vibrations during machining, resulting in reduced machining efficiency and decreased precision.

[0003] Shi Zhongquan et al. of Nanjing University of Aeronautics and Astronautics (Shi Zhongquan. Research on Online Control Technology of Machine Tool Vibration Based on CNC System [D]. Nanjing: Nanjing University of Aeronautics and Astronautics, 2017.) designed a hybrid dynamic vibration absorber based on voice coil motor to address the problem of tool vibration control. Sandvik Group developed the Silent series of vibration-damping tools and applied them (Xing Xiaofeng. Experience in using Sandvik Coromant vibration-damping tool holders [J]. Metalworking: Cold Working, 2015(7):16.

[100] ). By integrating a dynamic vibration absorber inside the tool holder, which includes a heavy mass block, a rubber spring used as a stiffening element, and oil used to generate damping, cutting vibration can be reduced. However, this method can only be used for tool holders with larger diameters and cannot be applied to tools with large length-to-diameter ratios. Patent CN118990032A discloses a device and adaptive vibration suppression method based on particle damping. It consumes tool vibration energy through collisions and friction between particles and between particles and the cavity, reducing amplitude and thus lowering the risk of chatter, improving cutting quality and machining accuracy. It effectively reduces tool wear and breakage caused by chatter, achieving broadband tool vibration suppression through a simple particle damper device. Patent CN117773976A discloses a piezoelectric active vibration control system and method for milling operations in industrial robots. It embeds a piezoelectric stack actuator inside the tool holder and connects it to an external analysis and control device via wires and brushes. The piezoelectric stack actuator contains a sensor that detects the tool's vibration displacement signal and transmits it to the external analysis and control device. After conversion, the analysis and control device feeds back the signal as a voltage to the piezoelectric stack actuator to drive the piezoelectric stack to counteract the tool's vibration displacement. However, this device increases the complexity of the tool, and the device rotates synchronously with the tool, making it difficult to independently eliminate tool vibration. The patent with publication number CN107972185A provides a tool holder with vibration reduction function. The tool holder is equipped with a damping block and a vibration reduction device to absorb the vibration during milling and convert it into potential energy. This solves the problem of reduced tool precision and coating peeling caused by vibration when milling stone. However, this patent technology only has a passive vibration reduction device, and the suppression effect needs to be improved. Summary of the Invention

[0004] To address the problems existing in the prior art, this invention provides an intelligent vibration reduction device for large length-to-diameter ratio cutting tools. When installed at the front end of the machine tool spindle, it can weaken the self-excited vibration during cutting with large length-to-diameter ratio cutting tools by combining active vibration suppression and passive vibration reduction, thereby improving the stability of cutting.

[0005] To achieve the above objectives, in a first aspect, the present invention provides an intelligent vibration reduction device for a large length-to-diameter ratio cutting tool, comprising a base, a piezoelectric composite beam, a bearing, a bearing sleeve, an outer sleeve, an inner sleeve, and a vibration isolation mesh. The inner sleeve, the vibration isolation mesh, and the cutting tool are coaxially arranged, with the vibration isolation mesh located between the cutting tool and the inner sleeve. The bearing is sleeved on the cutting tool, and a bearing sleeve is provided on the outside of the bearing. The outer sleeve is coaxially arranged with the cutting tool, with one end connected to the base and the other end suspended. Multiple piezoelectric composite beams are evenly arranged along the circumference of the cutting tool. One end of each piezoelectric composite beam is connected to the base, and the other end is connected to the bearing sleeve through a reversing structure. The inner sleeve is connected to the tool holder. A piezoelectric layer capable of outputting power is provided in the piezoelectric composite beam. The outer sleeve is a rigid sleeve, and the piezoelectric composite beam is connected to a piezoelectric actuator.

[0006] Furthermore, the inner sleeve has a squirrel cage structure and is an elastic sleeve.

[0007] Furthermore, the vibration isolation mesh is made of shape memory alloy, which is either a copper alloy or a nickel alloy.

[0008] Furthermore, the inner side of the vibration isolation mesh is in close contact with the tool, and the outer side of the vibration isolation mesh is in close contact with the inner wall of the inner sleeve, so the vibration isolation mesh is under radial pressure.

[0009] Furthermore, the piezoelectric composite beam is a thin sheet structure, comprising a power output layer, an intermediate support layer, and an elastic substrate, with the intermediate support layer located between the power output layer and the elastic substrate.

[0010] Furthermore, the power output layer is made of piezoelectric fiber composite material, the elastic substrate is made of epoxy resin, and the intermediate support layer is made of aluminum sheet.

[0011] Furthermore, a roller is installed on the inner side of the suspended end of the outer sleeve, one end of the piezoelectric laminate beam is connected to the base via a traction rope, and the other end of the piezoelectric laminate beam is connected to the bearing sleeve via a traction rope that passes around the roller.

[0012] Furthermore, a bearing is installed on the inside of the roller.

[0013] Furthermore, the piezoelectric laminate beam is independently connected to a piezoelectric actuator, which controls the piezoelectric laminate beam individually.

[0014] On the other hand, the present invention provides a large length-to-diameter ratio cutting tool, which is equipped with the intelligent vibration reduction device described above for the large length-to-diameter ratio cutting tool.

[0015] Compared with existing technologies, this invention has at least the following advantages: For tools with large length-to-diameter ratios, this invention employs a combination of active vibration suppression and passive vibration isolation for vibration reduction. Compared to single passive or active vibration suppression methods, this improves vibration reduction effectiveness and increases cutting stability. The active vibration suppression part of this invention uses a piezoelectric laminated beam as an actuator, which has good stiffness and damping characteristics and can output stable working force for vibration control, resulting in high performance and high reliability. Rolling bearings are used for motion transmission, enabling the application of working force during tool rotation. Furthermore, the piezoelectric laminated beam is arranged along the tool's axial direction, and a traction rope and rollers are used for power transmission, converting the working force of the piezoelectric laminated beam into a radial force on the tool. The overall structure is compact and highly stable, adaptable to machining complex thin-walled parts. Multiple piezoelectric laminated beam actuators can be evenly arranged around the tool's circumference as needed, with each actuator controlled independently. When the system detects tool chatter, the controller outputs a control signal to the piezoelectric actuator, which then outputs a corresponding voltage signal to the piezoelectric layer. This application is based on the inverse piezoelectric effect, where the piezoelectric layer generates a working force, which is transmitted to the bearing sleeve through a reversing structure. This causes the tool to be subjected to a radial working force, thereby weakening tool chatter and achieving vibration suppression. During the cutting process, a working force in the corresponding direction can be applied according to the direction of tool vibration, which helps to improve control accuracy and enhance the vibration reduction effect. The passive vibration reduction part of this invention uses an inner sleeve as a support and a cylindrical vibration isolation mesh made of shape memory alloy wire is used. The vibration isolation mesh is nested between the inner sleeve and the tool. The inner sleeve and the vibration isolation mesh rotate synchronously with the tool, which can improve the support stiffness of tools with large length-to-diameter ratios and can reduce tool vibration through frictional energy dissipation. This invention selects shape memory alloy as a friction damping material, which can overcome the shortcomings of ordinary metal materials that are prone to wear and deformation.

[0016] Furthermore, the inner sleeve of the present invention adopts a squirrel cage structure with elongated holes, giving the structure good elasticity and facilitating heat dissipation from the vibration isolation mesh. The squirrel cage structure also possesses multi-directional elastic deformation capabilities, and the elastic sleeve material further enhances its deformation characteristics. This allows it to tightly fit the vibration isolation mesh and the tool holder while adapting to minor bending deformations during tool cutting, preventing vibration amplification or tool damage caused by rigid contact. The elastic deformation characteristics further absorb vibrations that are not fully attenuated by the vibration isolation mesh, converting vibration energy into elastic potential energy through its own deformation, thus helping to improve the overall passive vibration reduction effect.

[0017] Furthermore, shape memory alloys have a deformation-recovery shape memory effect, which allows them to automatically recover their initial shape after deformation under vibration, continuously maintaining radial constraint on the tool and avoiding vibration reduction failure caused by long-term compression deformation of traditional vibration isolation materials.

[0018] Furthermore, the vibration isolation mesh is tightly attached to the tool on the inside and tightly attached to the inner wall of the inner sleeve on the outside. The gapless design allows the vibration isolation mesh to continuously squeeze and rub against the contact surface, applying a continuous radial preload to the tool. This provides flexible support for tools with a large length-to-diameter ratio to a certain extent, effectively suppressing the radial bending vibration and chatter of the tool.

[0019] Furthermore, the piezoelectric laminated beam is a thin sheet structure. The core layer uses epoxy resin as an elastic substrate; the middle layer uses metal sheets to provide a certain supporting stiffness; and the outer layer uses a piezoelectric fiber composite material layer to provide power. Using epoxy resin and aluminum sheets as supports can improve the problem of the high brittleness of piezoelectric materials and give the piezoelectric laminated beam good damping and supporting stiffness, which is beneficial to reducing tool vibration. By utilizing piezoelectric fiber composite materials for power output, active vibration control can be achieved. Furthermore, the thin-sheet structure is lightweight and has low inertia, allowing for rapid response to frequency changes in tool cutting vibration, thus solving the problem of lag in response of traditional heavy-duty vibration damping structures. The power output layer provides the damping power, the intermediate support layer ensures the structural strength of the beam, and the elastic base provides elastic deformation capability, ensuring that the beam will not break or fail due to high-frequency vibration while outputting controllable power. The power output layer uses piezoelectric fiber composite materials, which, compared to piezoelectric ceramics, have better toughness, are less prone to brittle fracture, and provide more uniform power output, while also adapting to complex vibration conditions. The elastic base uses epoxy resin, which is elastic and lightweight. The intermediate support layer uses aluminum sheets, which are high-strength and low-density, reducing the overall weight of the piezoelectric layer composite beam and preventing the deterioration of tool vibration characteristics due to excessive added mass.

[0020] Furthermore, the rollers at the suspended end of the outer sleeve change the direction of force transmission of the traction rope, enabling the working force of the piezoelectric laminated beam to be transmitted to the bearing sleeve and the cutting tool more efficiently, reducing force loss during transmission, and improving the response speed and control accuracy of active vibration reduction; the traction rope is a flexible connection, which can be combined with the thin sheet structure of the piezoelectric laminated beam to achieve more flexible vibration adjustment, while avoiding vibration transmission caused by rigid connection, further optimizing the active vibration reduction effect.

[0021] Furthermore, bearings are installed on the inner side of the rollers to reduce the resistance of the traction rope and efficiently and quickly change the direction of the piezoelectric laminate beam force.

[0022] Furthermore, the piezoelectric laminate beams are independently connected to piezoelectric actuators, which individually control the piezoelectric laminate beams. Each piezoelectric laminate beam can output different actuating forces, which helps to achieve precise control of the cutting tool. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of the overall structure of the present invention; Figure 2 This is a cross-sectional view of the overall structure of the present invention; Figure 3This is a partial cross-sectional view of the present invention; Figure 4 This is a schematic diagram of the piezoelectric laminated beam structure of the present invention; In the diagram: 1-base; 2-piezoelectric composite beam; 3-bearing; 4-bearing sleeve; 5-traction rope; 6-outer sleeve; 7-roller; 8-inner sleeve; 9-vibration isolation net; 10-tool holder; 11-tool; 201-power output layer; 202-intermediate support layer; 203-elastic base. Detailed Implementation

[0024] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0025] As attached Figure 1 , Figure 2 and Figure 3As shown, this invention provides an intelligent vibration damping device for large length-to-diameter ratio cutting tools. Installed at the front end of a machine tool spindle, it weakens the vibration of large length-to-diameter ratio tools through a combination of active and passive vibration damping, improving cutting stability. Specifically, the intelligent vibration damping device includes an active vibration damping section and a passive vibration damping section. The active vibration damping section includes a base 1, a piezoelectric laminate beam 2, a bearing 3, a bearing sleeve 4, a traction rope 5, an outer sleeve 6, and rollers 7. The passive vibration damping section includes an inner sleeve 8 and a vibration isolation mesh 9. The vibration isolation mesh 9 is a cylindrical metal mesh made of shape memory alloy wire, possessing excellent damping characteristics and reducing tool vibration through frictional energy dissipation. The rolling bearing 3 is nested between the cutting tool 11 and the bearing sleeve 4. The inner ring of the bearing 3 rotates synchronously with the cutting tool 11, while the outer ring and the bearing sleeve 4 remain relatively stationary. The outer sleeve 6 is mounted on the base 1 at the front end of the spindle, and its inner wall is provided with multiple rollers 7 evenly distributed along the circumference. The piezoelectric laminated beam 2 is a thin sheet structure. One end of the piezoelectric laminated beam 2 is connected to the base 1 by a traction rope 5, and the other end is connected to the bearing sleeve 4 via the traction rope 5 after passing over the roller 7. The working force of the piezoelectric laminated beam 2 can be transmitted to the rolling bearing 3 through the traction rope 5, thereby generating a radial working force on the tool 11. The intelligent vibration suppression tool system of this application achieves multi-modal suppression of tool vibration through the coordinated operation of active control and passive energy dissipation. Its core lies in the integration of an active actuation unit based on the piezoelectric laminated beam 2 and a passive damping unit made of shape memory alloy. The two work together to effectively cope with broadband vibration. The system can make real-time dynamic adjustments based on the signals fed back by vibration sensors installed on the machine tool or tool 11. The controller can drive each piezoelectric laminated beam 2 to independently output working force, applying precise radial force to the tool 11 from multiple directions to actively counteract the detected vibration. The combination of active control and passive friction energy dissipation of the shape memory alloy mesh forms a composite vibration suppression mechanism, which can more comprehensively suppress various vibrations from low frequency to high frequency.

[0026] The piezoelectric laminate beam 2 possesses certain stiffness and damping characteristics, and can generate power based on control signal output to suppress tool vibration. The bearing 3 is a small rolling bearing, nested between the tool and the bearing sleeve 4. The inner ring of the bearing rotates synchronously with the tool 11, while the outer ring and the bearing sleeve 4 remain relatively stationary. The outer sleeve 6 is mounted on the base 1 at the front end of the spindle, and its inner wall is provided with multiple rollers 7 evenly distributed along the circumference.

[0027] The inner sleeve 8 is positioned at the front end of the tool holder 10 and rotates synchronously with it. The inner sleeve 8 is designed as a squirrel cage structure, possessing a certain degree of elasticity and facilitating heat dissipation. The vibration isolation mesh 9 uses copper-based shape memory alloy wire as its main material, forming a cylindrical metal mesh. The vibration isolation mesh 9 is in direct contact with the tool 11, reducing tool 11 vibration through frictional energy dissipation. The inner sleeve 8, designed as a squirrel cage structure, is installed at the front end of the tool holder 10 and rotates synchronously with it. Its elastic structure buffers vibration and reduces stress concentration. The outer sleeve 6 is fixed to the base 1, providing a stable and reliable mounting position for the roller 7 and the traction rope 5.

[0028] Choosing shape memory alloys as friction damping materials can overcome the shortcomings of ordinary metal materials, such as easy wear and deformation. Furthermore, copper-based shape memory alloys, as high-damping materials, are more suitable for vibration damping mechanisms than ordinary shape memory alloys. Preferably, the shape memory alloy material is a copper alloy; copper-based shape memory alloys, as high-damping materials, are more suitable for vibration damping mechanisms than ordinary shape memory alloys.

[0029] One end of the piezoelectric laminated beam 2 is connected to the base 1, and the other end is connected to the bearing sleeve 4 via a reversing structure. Specifically, the piezoelectric laminated beam is a thin sheet structure. A traction rope 5 connects one end of the piezoelectric laminated beam 2 to the base 1 at the front end of the spindle, and the other end, via the traction rope 5, passes over the roller 7 and connects to the bearing sleeve 4. The working force of the piezoelectric laminated beam 2 can be transmitted to the rolling bearing via the traction rope 5, thereby generating radial working force on the tool 11. A roller 7 is installed on the inner side of the suspended end of the outer sleeve 6. One end of the piezoelectric laminated beam 2 is connected to the base 1 via the traction rope 5, and the other end, via the traction rope 5, passes over the roller 7 and connects to the bearing sleeve 4. The roller 7 can be mounted on the outer sleeve 6 via a roller bracket, and a bearing can be installed on the roller bracket. The bearing reduces the resistance of the roller 7 and improves the force redirection efficiency. The reversing mechanism connected to the piezoelectric laminated beam 2 converts the deformation of the laminated beam into a radial force on the tool 11. The roller 7 is mounted through a bearing to reduce friction loss and ensure the efficiency of force transmission and response speed. The bearing 3 is the key to connecting the rotating and non-rotating parts. Its inner ring rotates synchronously with the tool holder 10, while its outer ring remains relatively stationary with the bearing sleeve 4. While isolating the rotational motion, it achieves efficient transmission of radial force.

[0030] Multiple piezoelectric laminated beams 2 are evenly arranged circumferentially inside the outer sleeve 6, applying radial force from multiple directions. Each piezoelectric laminated beam 2 is independently connected to a piezoelectric actuator, which controls the piezoelectric laminated beam 2 individually, achieving individual intelligent regulation.

[0031] refer to Figure 4The piezoelectric composite beam 2 is a thin-sheet structure. The core layer uses epoxy resin as an elastic substrate 203; the intermediate support layer 202 uses aluminum sheets to provide support stiffness; and the power output layer 201 uses piezoelectric fiber composite material to provide power. Using epoxy resin and aluminum sheets as supports can improve the problem of the high brittleness of piezoelectric materials and give the piezoelectric composite beam 2 better damping and support stiffness, which is beneficial for reducing the vibration of the tool 11. Utilizing the piezoelectric fiber composite material to output power enables active vibration control.

[0032] The working principle of the active vibration suppression part is as follows: When the system detects chatter in the tool 11, the controller outputs a control signal to the piezoelectric actuator, and the piezoelectric actuator outputs a corresponding voltage signal to the power output layer 201. Based on the inverse piezoelectric effect, the power output layer 201, made of piezoelectric fiber composite material, generates power and transmits it to the bearing sleeve 4 through the traction rope 5, so that the tool 11 is subjected to radial power, thereby weakening tool chatter and achieving vibration suppression.

[0033] The passive vibration damping section includes an inner sleeve 8 and a vibration isolation mesh 9. The inner sleeve 8 is positioned at the front end of the tool holder 10 and rotates synchronously with it. The inner sleeve 8 is designed as a squirrel-cage structure, providing elasticity and facilitating heat dissipation. The inner side of the vibration isolation mesh 9 is in close contact with the tool 11, and the outer side is in close contact with the inner wall of the inner sleeve 8, placing the mesh under radial compression. The vibration isolation mesh 9 uses copper-based shape memory alloy wire as its main material, forming a cylindrical metal mesh. The metal mesh is in direct contact with the tool 11, reducing tool vibration through frictional energy dissipation. Choosing copper-based shape memory alloy as the friction damping material overcomes the shortcomings of ordinary metal materials, which are prone to wear and deformation. Furthermore, as a high-damping material, copper-based shape memory alloy is more suitable for use in vibration damping mechanisms. The passive damping uses a cylindrical metal mesh woven from copper-based shape memory alloy wires. The vibration isolation mesh is in direct contact with the cutting tool and consumes vibration energy through friction. During cyclic stress, the copper-based shape memory alloy can dissipate a large amount of energy through internal phase transformation. Moreover, its wear resistance and shape recovery ability are superior to ordinary metals, overcoming the shortcomings of traditional friction materials that are prone to wear and deformation, and thus having a longer service life.

[0034] The principle of the passive vibration damping section is as follows: Copper-based shape memory alloy wires are configured as a cylindrical metal mesh, giving it a certain rigidity and good damping characteristics. The vibration isolation mesh 9 is installed in the inner sleeve 8 to support the cutting tool, thereby improving the support rigidity of the large aspect ratio cutting tool 11. Furthermore, the vibration of the cutting tool 11 during the cutting process is directly transmitted to the vibration isolation mesh 9. The copper-based shape memory alloy wires of the vibration isolation mesh 9 dissipate the vibration energy of the cutting tool 11 through friction, achieving a vibration reduction effect.

[0035] In summary, the intelligent vibration reduction device for large length-to-diameter ratio cutting tools provided by this invention adopts a vibration reduction method that combines active vibration suppression and passive vibration isolation. Compared with single passive vibration reduction or active vibration suppression, it can further improve the vibration reduction effect and enhance the stability of the cutting process. The active vibration suppression part uses a piezoelectric laminated beam 2 as an actuator, which has good stiffness and damping characteristics and can output stable working force. The motion is transmitted through rolling bearings, which can apply working force during the rotation of the cutting tool. The piezoelectric laminated beam 2 is arranged along the axial direction of the cutting tool and transmits the working force through the traction rope 5 and the roller mechanism, thereby converting the working force into the radial control force of the cutting tool. Multiple piezoelectric laminated beam 2 actuators can be evenly arranged in the circumferential direction of the cutting tool as needed, and each actuator can be controlled independently.

[0036] The above content is only for illustrating the technical concept of the present invention and should not be construed as limiting the scope of protection of the present invention. Any modifications made to the technical solution based on the technical concept proposed in this invention shall fall within the scope of protection of the claims of this invention.

Claims

1. An intelligent vibration damping device for a large length-to-diameter ratio cutting tool, characterized in that, The device includes a base (1), a piezoelectric composite beam (2), a bearing (3), a bearing sleeve (4), an outer sleeve (6), an inner sleeve (8), and a vibration isolation net (9). The inner sleeve (8), the vibration isolation net (9), and the cutting tool (11) are coaxially arranged. The vibration isolation net (9) is located between the cutting tool (11) and the inner sleeve (8). The bearing (3) is sleeved on the cutting tool (11). The bearing sleeve (4) is set on the outside of the bearing (3). The outer sleeve (6) is coaxially arranged with the cutting tool. One end of the outer sleeve (6) is connected to the base (1), and the other end is suspended. Multiple piezoelectric composite beams (2) are evenly arranged along the circumference of the cutting tool. One end of the piezoelectric composite beam (2) is connected to the base (1), and the other end is connected to the bearing sleeve (4) through a reversing structure. The inner sleeve (8) is connected to the tool holder (10). The piezoelectric composite beam (2) is provided with a piezoelectric layer that can output power. The outer sleeve (6) is a rigid sleeve. The piezoelectric composite beam (2) is connected to a piezoelectric actuator.

2. The intelligent vibration reduction device for large length-to-diameter ratio cutting tools according to claim 1, characterized in that, The inner sleeve (8) is a rat cage structure and is an elastic sleeve.

3. The intelligent vibration reduction device for large length-to-diameter ratio cutting tools according to claim 1, characterized in that, The vibration isolation mesh (9) is made of shape memory alloy, and the material is copper alloy or nickel alloy.

4. The intelligent vibration reduction device for large length-to-diameter ratio cutting tools according to claim 1, characterized in that, The inner side of the vibration isolation net (9) is in close contact with the tool (11), and the outer side of the vibration isolation net (9) is in close contact with the inner wall of the inner sleeve (8). The vibration isolation net (9) is under radial pressure.

5. The intelligent vibration reduction device for large length-to-diameter ratio cutting tools according to claim 1, characterized in that, The piezoelectric composite beam (2) is a thin sheet structure, including a power output layer (201), an intermediate support layer (202) and an elastic substrate (203), with the intermediate support layer (202) located between the power output layer (201) and the elastic substrate (203).

6. The intelligent vibration reduction device for large length-to-diameter ratio cutting tools according to claim 5, characterized in that, The power output layer (201) is made of piezoelectric fiber composite material, the elastic substrate (203) is made of epoxy resin, and the intermediate support layer (202) is made of aluminum sheet.

7. The intelligent vibration reduction device for large length-to-diameter ratio cutting tools according to claim 1, characterized in that, One end of the piezoelectric composite beam (2) is connected to the base (1), and the other end is connected to the bearing sleeve (4) through a reversing structure. A roller (7) is set on the inner side of the suspended end of the outer sleeve (6). One end of the piezoelectric composite beam (2) is connected to the base (1) through a traction rope (5), and the other end of the piezoelectric composite beam (2) is connected to the bearing sleeve (4) through a traction rope (5) that passes around the roller (7).

8. The intelligent vibration reduction device for large length-to-diameter ratio cutting tools according to claim 7, characterized in that, A bearing is installed on the inner side of the roller (7).

9. The intelligent vibration reduction device for large length-to-diameter ratio cutting tools according to claim 1, characterized in that, The piezoelectric laminated beam (2) is independently connected to the piezoelectric actuator, and the piezoelectric actuator controls the piezoelectric laminated beam (2) separately.

10. A cutting tool with a large length-to-diameter ratio, characterized in that, The intelligent vibration reduction device for the large length-to-diameter ratio cutting tool as described in any one of claims 1-9 is provided.

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