Shock-resistant milling cutter disc and milling cutter assembly

Abstract

The anti-vibration milling cutter disc comprises a cutter disc body, and a plurality of blades are arranged on the edge of the cutter disc body; a plurality of blind holes extending in the radial direction are formed in the circumferential surface of the cutter head body, mounting seats are arranged in the blind holes, one ends of the mounting seats extend out of the blind holes, and the blades are mounted at the outer ends of the mounting seats; a connecting column is connected to the inner end of the mounting seat, a damping sleeve is arranged on the connecting column, end plates are arranged at the two ends of the damping sleeve, and a plurality of through holes are formed in the end plates and the damping sleeve; damping liquid is filled between the inner end of the mounting base and the bottom of the blind hole, and the viscosity of the damping liquid ranges from 0.1 Pa.s to 0.5 Pa.s. According to the milling cutter assembly, vibration of the cutter bar can be reduced, and the interior of the cutter bar can be cooled through vibration power generation.

Description

Technical Field

[0001] The invention belongs to the technical field of milling processing, in particular to a shock-resistant milling cutter disc and a milling cutter assembly. Background Art

[0002] Milling cutters are commonly used tools for machining, and can process structures such as planes, steps, and grooves. When the milling cutter is working, it is subject to cutting resistance, which causes the milling cutter to vibrate, affecting the machining accuracy of the parts and the service life of the milling cutter. Therefore, it is necessary to reduce the vibration of the milling cutter when it is working.

[0003] At present, a more common shock-absorbing method is to set a resistor in the milling cutter. For example, the invention patent with application number CN202111464442.8 discloses a vibration-damping milling cutter, including a milling cutter head, a shank, a connecting frame and a damper. A first connecting rod is coaxially provided on the end face of one end of the milling cutter head; a second connecting rod is coaxially provided on the end face of one end of the shank; a cavity is opened inside the connecting frame, one end of the connecting frame is connected to the milling cutter head, and the other end of the connecting frame is connected to the shank, the first connecting rod and the second connecting rod are both located in the cavity, and the first connecting rod and the second connecting rod are arranged opposite to each other; the damper is installed in the cavity, the damper includes a mass block and a magnet group, the magnet group is installed on the mass block, and the opposite ends of the first connecting rod and the second connecting rod are respectively abutted against the ends of the two ends of the mass block, when the damper vibrates, the connecting frame cuts the axial magnetic field generated by the magnet group, generates eddy currents, thereby achieving a damping effect. This technology has a good shock-absorbing effect, but during cutting, the milling cutter disc will generate a large amount of heat. Part of the heat from the milling cutter disc is taken away by the cutting fluid, but part of the heat is transferred to the tool bar, and the heat inside the tool bar is difficult to dissipate. The various damping and shock-absorbing mechanisms used in the prior art will also directly or indirectly convert vibrations into heat energy during operation, further increasing the heat inside the tool bar and affecting the performance of the tool bar. In addition, the multiple blades on the milling cutter disc are in direct contact with the workpiece, and the prior art does not directly design shock absorption for the milling cutter disc. Summary of the invention

[0004] The technical problem to be solved by the present invention is to provide a vibration-resistant milling cutter disc and a milling cutter assembly, which can reduce vibration and accelerate the heat dissipation of the cutter bar to ensure stability during milling processing.

[0005] In order to solve the above problems, the technical solution adopted by the present invention is as follows: the anti-vibration milling cutter disc comprises a cutter disc body, and a plurality of blades are arranged on the edge of the cutter disc body;

[0006] The circumferential surface of the cutter disc body is provided with a plurality of radially extending blind holes, a mounting seat is provided in the blind hole, one end of the mounting seat extends out of the blind hole, and the blade is mounted on the outer end of the mounting seat;

[0007] The inner end of the mounting seat is connected to a connecting column, a shock-absorbing sleeve is arranged on the connecting column, end plates are arranged at both ends of the shock-absorbing sleeve, and multiple through holes are arranged on the end plates and the shock-absorbing sleeve; shock-absorbing fluid is filled between the inner end of the mounting seat and the bottom of the blind hole, and the viscosity of the shock-absorbing fluid is 0.1Pa·s to 0.5Pa·s.

[0008] Furthermore, the diameters of the through holes on the end plate and the shock-absorbing sleeve are 0.1 to 0.2 mm.

[0009] Furthermore, the shock-absorbing fluid is silicone oil.

[0010] Furthermore, the connecting column is a heat dissipation pipe, the axial direction of the heat dissipation pipe is consistent with the radial direction of the cutter disc body, the heat dissipation pipe includes a heat absorption end, a tube body and a heat release end arranged in sequence, and the inner walls of the heat absorption end and the heat release end are provided with a capillary structure layer; the interior of the heat dissipation pipe is negative pressure, and the heat dissipation pipe is filled with a liquid medium; the cutter disc body is provided with a central blind hole, the heat absorption end is embedded in the mounting seat, the heat release end extends to the central blind hole, and the shock-absorbing sleeve is located outside the tube body.

[0011] A milling cutter assembly comprises a cutter bar and the above-mentioned anti-vibration milling cutter disc, wherein a shock absorbing cavity is arranged inside the cutter bar, the anti-vibration milling cutter disc is mounted at one end of the cutter bar, a central axis is arranged at one end of the anti-vibration milling cutter disc, the central axis extends into the shock absorbing cavity, and the central axis is coaxial with the cutter bar; the characteristics are as follows:

[0012] A positioning sleeve is fixedly arranged in the shock absorbing cavity, the central axis is located inside the positioning sleeve, and a first piezoelectric material layer is arranged between the central axis and the positioning sleeve;

[0013] The side wall of the shock absorbing cavity is provided with a plurality of strip holes, each of which is provided with an insulating mounting groove, each of which is provided with a Pettel effect sheet, the first piezoelectric material layer is connected to a rectifier via a wire, the rectifier is connected to the Pettel effect sheet via a wire, the heat absorbing end of the Pettel effect sheet faces the shock absorbing cavity, and the heat releasing end of the Pettel effect sheet faces outward.

[0014] Furthermore, the first piezoelectric material layer is a polyvinylidene fluoride film.

[0015] Furthermore, the outer wall of the positioning sleeve is provided with a plurality of radially extending sliding sleeves, the sliding sleeve is provided with a pressure block that slides with the sliding sleeve, the top of the sliding sleeve is fixedly provided with a top plate, the inner side wall of the top plate is provided with a second piezoelectric material layer, and the second piezoelectric material layer is connected to the rectifier through a wire; the side wall of the sliding sleeve is provided with a plurality of air holes.

[0016] Furthermore, a flexible sleeve is provided on the outside of the central axis, a plurality of positioning grooves are provided on the outer wall of the flexible sleeve, a plurality of rigid blocks are provided in the positioning grooves, and the rigid blocks contact the first piezoelectric material layer.

[0017] Furthermore, the flexible sleeve is a rubber sleeve.

[0018] The beneficial effects of the present invention are: 1. The seismic-resistant milling cutter disc of the present invention is achieved by installing the blade on the mounting seat, and arranging a connecting column on the mounting seat, arranging a shock-absorbing sleeve and an end plate on the connecting column, and the shock-absorbing sleeve and the end plate are immersed in a shock-absorbing fluid. During the milling process, when the blade vibrates, the vibration is transmitted to the mounting seat and the connecting column. When the connecting column vibrates, the shock-absorbing sleeve and the end plate are driven to vibrate. When the shock-absorbing sleeve and the end plate vibrate, a shock-absorbing fluid with a certain viscosity continuously enters and exits the small-diameter through holes on the shock-absorbing sleeve and the end plate. The friction resistance between the shock-absorbing fluid and the through holes has a good damping effect, which can effectively absorb the vibration movement of the mounting seat.

[0019] 2. The milling cutter assembly of the present invention, the first piezoelectric material layer, the rectifier and the Pettel effect sheet constitute a piezoelectric damping device. When the anti-seismic milling cutter disc vibrates, it drives the central axis to vibrate, so that the central axis produces irregular pressure on the first piezoelectric material layer. The first piezoelectric material layer can absorb the vibration, and the first piezoelectric material layer generates alternating current, which is converted into direct current by the rectifier and then transmitted to the Pettel effect sheet. When the direct current passes through the Pettel effect sheet, it can transfer heat from the heat absorbing end of the Pettel effect sheet to the heat releasing end, so that the heat inside the tool bar can be quickly discharged to avoid excessive temperature inside the tool bar. It can be seen that the milling cutter assembly of the present invention can not only reduce the vibration of the tool bar, but also use vibration to generate electricity to cool the inside of the tool bar. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 is a schematic cross-sectional view of the anti-vibration milling cutter disc of the present invention;

[0021] Figure 2 It is a schematic diagram of the shock-absorbing sleeve;

[0022] Figure 3 is a schematic cross-sectional view of a connecting column;

[0023] Figure 4 is a schematic cross-sectional view of a milling cutter assembly of the present invention;

[0024] Figure numerals: 1—tool bar; 2—vibration-resistant milling cutter disc; 21—cutter disc body; 22—blind hole; 23—blade; 24—mounting seat; 25—connecting column; 251—heat absorption end; 252—tube body; 253—heat release end; 255—capillary structure layer; 26—shock-absorbing sleeve; 27—end plate; 28—shock-absorbing fluid; 29—center blind hole; 3—shock-absorbing cavity; 4—center axis; 5—positioning sleeve; 6—first piezoelectric material layer; 7—insulating mounting groove; 8—Pettel effect sheet; 9—rectifier; 10—sliding sleeve; 11—pressure block; 12—top plate; 13—second piezoelectric material layer; 14—flexible sleeve; 15—rigid block. DETAILED DESCRIPTION

[0025] The present invention is further described below in conjunction with the accompanying drawings and embodiments.

[0026] The anti-vibration milling cutter disc of the present invention is as follows Figure 1 , Figure 2 and Figure 3 As shown, it includes a cutter disc body 21, which is in the shape of a disc. A plurality of blades 23 are arranged at the edge of the cutter disc body 21. The blades 23 are used for milling parts, and various existing milling blades can be used.

[0027] The circumferential surface of the cutter disc body 21 is provided with a plurality of radially extending blind holes 22, and the number of the blind holes 22 is the same as the number of the blades 23. A mounting seat 24 is provided in the blind hole 22, one end of the mounting seat 24 extends out of the blind hole 22, and the blade 23 is mounted on the outer end of the mounting seat 24. The mounting seat 24 can be connected to the cutter disc body 21 by screws, and the blade 23 can be mounted on the mounting seat 24 by screws.

[0028] The inner end of the mounting seat 24 (i.e., the end located in the blind hole 22) is connected to a connecting column 25, and a shock-absorbing sleeve 26 is provided on the connecting column 25. End plates 27 are provided at both ends of the shock-absorbing sleeve 26, and multiple through holes are provided on the end plates 27 and the shock-absorbing sleeve 26; the space between the inner end of the mounting seat 24 and the bottom of the blind hole 22 is filled with a shock-absorbing liquid 28, and the viscosity of the shock-absorbing liquid 28 is 0.1Pa·s to 0.5Pa·s.

[0029] The end plate 27 and the shock-absorbing sleeve 26 are immersed in the shock-absorbing liquid 28. When the end plate 27 and the shock-absorbing sleeve 26 move in the shock-absorbing liquid 28, the shock-absorbing liquid 28 will pass through the through holes on the end plate 27 and the shock-absorbing sleeve 26. The diameter of the through hole is small, and because the viscosity of the shock-absorbing liquid 28 is large, the shock-absorbing liquid 28 has a large viscosity and friction when entering and exiting the through hole. When the blade 23 vibrates during the milling process, the vibration motion is transmitted to the connecting column 25 through the mounting seat 24. The connecting column 25 drives the end plate 27 and the shock-absorbing sleeve 26 to vibrate, causing the shock-absorbing liquid 28 to enter and exit the through holes on the end plate 27 and the shock-absorbing sleeve 26. Under the action of the viscosity and friction, the vibration amplitude of the end plate 27 and the shock-absorbing sleeve 26 is reduced.

[0030] In order to prevent the shock absorbing fluid 28 from leaking, a sealing ring may be provided between the mounting seat 24 and the inner wall of the blind hole 22 .

[0031] In the present invention, the diameter of the through holes on the end plate 27 and the shock-absorbing sleeve 26 is 0.1 to 0.2 mm.

[0032] In the present invention, the shock absorbing fluid 28 is silicone oil, specifically silicone oil with a viscosity of 0.1 Pa·s to 0.5 Pa·s. In addition, hydraulic oil with a viscosity that meets the requirements may also be used.

[0033] The connecting column 25 can be a circular column integrally formed with the mounting seat 24. In order to promote heat dissipation inside the cutter disc body 21, the connecting column 25 is a heat dissipation pipe. The axial direction of the heat dissipation pipe is consistent with the radial direction of the cutter disc body 21. The heat dissipation pipe includes a heat absorbing end 251, a tube body 252 and a heat releasing end 253 arranged in sequence. The heat absorbing end 251, the tube body 252 and the heat releasing end 253 can be made of copper. The inner walls of the heat absorbing end 251 and the heat releasing end 253 are provided with a capillary structure layer 255; the inside of the heat dissipation pipe is negative pressure, and the heat dissipation pipe is filled with a liquid medium, and the liquid medium can be pure water. The cutter disc body 21 is provided with a central blind hole 29, the heat absorbing end 251 is embedded in the mounting seat 24, the heat releasing end 253 extends to the central blind hole 29, and the shock absorbing sleeve 26 is located outside the tube body 252.

[0034] Heat pipes are commonly used heat dissipation components. The evaporation end absorbs heat, causing the medium inside to vaporize. The vaporized medium moves to the cooling end and liquefies, and then returns to the evaporation end along the capillary structure layer on the inner wall of the heat pipe to achieve medium circulation. Conventional heat pipes require a capillary structure layer to be set on the entire inner wall, which is difficult to produce. The reflux speed of the liquefied medium is limited, and the evaporation speed of the evaporation end is also limited, which is not conducive to improving the heat dissipation effect.

[0035] In the present invention, it is only necessary to set the capillary structure layer 255 on the inner wall of the heat absorbing end 251 and the heat releasing end 253. The inner wall of the tube body 252 is a smooth surface, which reduces the setting area of ​​the capillary structure layer 255, and reduces the manufacturing difficulty and manufacturing cost. The capillary structure layer 255 in the heat absorbing end 251 and the heat releasing end 253 can increase the evaporation or cooling area. When the milling cutter disc rotates at high speed during operation, the liquid medium inside the heat dissipating pipe is subjected to centrifugal force. Under the action of centrifugal force, the liquid medium at the heat releasing end 253 can quickly return to the heat absorbing end 251 along the tube body 252. Compared with the traditional heat pipe, the reflux effect of the centrifugal force is much better than the capillary effect of the capillary structure layer. The reflux speed of the liquid medium is faster, so the circulation speed is faster, which can significantly improve the heat dissipation effect. In addition, the heat absorbing end 251 vibrates with the mounting seat 24, driving the medium inside the heat absorbing end 251 to vibrate, which can cause the medium to evaporate faster and further improve the heat dissipation efficiency.

[0036] Most of the heat generated by the blade 23 is taken away by the milling fluid, and part of the heat is transferred to the mounting seat 2. The heat of the mounting seat 24 is transferred to the heat absorption end 251, causing the liquid medium in the heat absorption end 251 to evaporate and gasify. The vaporized medium flows to the heat release end 253, and the cutting fluid can enter the central blind hole 29, causing the gaseous medium in the heat release end 253 to quickly cool and liquefy, thereby realizing heat transfer and avoiding excessive temperature inside the cutter head body 21.

[0037] The milling cutter assembly of the present invention, such as Figure 4 As shown, it includes a tool bar 1 and Figure 1The shock-resistant milling cutter disc 2 shown has a shock-absorbing cavity 3 arranged inside the cutter bar 1. The shock-resistant milling cutter disc 2 is installed at one end of the cutter bar 1. A center axis 4 is arranged at one end of the shock-resistant milling cutter disc 2. The center axis 4 extends into the shock-absorbing cavity 3, and the center axis 4 is coaxial with the cutter bar 1.

[0038] A positioning sleeve 5 is fixedly arranged in the shock absorbing cavity 3, the central axis 4 is located inside the positioning sleeve 5, the positioning sleeve 5 is coaxial with the central axis 4, and a first piezoelectric material layer 6 is arranged between the central axis 4 and the positioning sleeve 5, and the central axis 4 contacts the first piezoelectric material layer 6. The first piezoelectric material layer 6 generates voltage after being squeezed, thereby converting the kinetic energy of vibration into electrical energy.

[0039] The side wall of the damping cavity 3 is provided with a plurality of strip holes, each of which is provided with an insulating mounting groove 7, which can be a plastic groove, and each of which is provided with a Peltier effect sheet 8, which includes a plurality of P-type semiconductors and a plurality of N-type semiconductors, which are alternately arranged. When direct current is passed to the Peltier effect sheet 8, one end of the Peltier effect sheet 8 can absorb heat from the outside, and the other end can release heat to the outside, thereby realizing heat transfer. The first piezoelectric material layer 6 is connected to a rectifier 9 through a wire, and the rectifier 9 is connected to the Peltier effect sheet 8 through a wire, and the heat absorbing end of the Peltier effect sheet 8 faces the damping cavity 3, and the heat releasing end of the Peltier effect sheet 8 faces the outside. Since the first piezoelectric material layer 6 generates alternating current, a rectifier 9 is used to convert the alternating current into direct current to meet the working requirements of the Peltier effect sheet 8. The insulating mounting groove 7 can prevent the Peltier effect sheet 8 from leaking electricity, and the positioning sleeve 5 can also be an insulating sleeve.

[0040] When the anti-vibration milling cutter disc 2 vibrates, it drives the central shaft 4 to vibrate, and the vibration kinetic energy of the central shaft 4 is converted into alternating current through the first piezoelectric material layer 6. The alternating current is rectified into direct current by the rectifier 9 and then transmitted to the Peltier effect sheet 8. The Peltier effect sheet 8 absorbs the heat inside the tool rod 1 and releases the heat to the outside of the tool rod 1, thereby achieving heat dissipation for the tool rod 1.

[0041] In the present invention, the first piezoelectric material layer 6, the rectifier 9 and the Peltier effect sheet 8 form a piezoelectric damping device, which can effectively reduce the vibration of the anti-vibration milling cutter head 2, and at the same time promote the heat dissipation inside the tool bar 1 to prevent the internal temperature of the tool bar 1 from being too high and affecting the strength.

[0042] In the present invention, the first piezoelectric material layer 6 can be made of piezoelectric ceramics, preferably polyvinylidene fluoride film, which is a flexible film with large deformation, low impedance, and can generate higher voltage.

[0043] In order to increase the electric energy provided to the Pettel effect sheet 8 and enhance the heat dissipation effect, the outer wall of the positioning sleeve 5 is provided with a plurality of radially extending sleeves 10, the sleeve 10 is provided with a pressing block 11 that slides with the sleeve 10, the top of the sleeve 10 is fixedly provided with a top plate 12, the inner side wall of the top plate 12 is provided with a second piezoelectric material layer 13, the second piezoelectric material layer 13 can also be a polyvinylidene fluoride film, and the second piezoelectric material layer 13 is connected to the rectifier 9 through a wire; the side wall of the sleeve 10 is provided with a plurality of air holes. During milling, the tool bar 1 rotates at a high speed, and the pressing block 11 is subjected to centrifugal force, thereby sliding along the sleeve 10 to the inner side of the top plate 12, and the centrifugal force of the pressing block 11 is transmitted to the second piezoelectric material layer 13, and the second piezoelectric material layer 13 will also generate electric energy after being compressed, and the electric energy generated by the second piezoelectric material layer 13 is transmitted to the Pettel effect sheet 8, thereby increasing the current passing through the Pettel effect sheet 8 and improving the heat absorption and heat release efficiency.

[0044] The central axis 4 is provided with a flexible sleeve 14 on the outside. The flexible sleeve 14 can be a rubber sleeve. The flexible sleeve 14 is provided with a plurality of positioning grooves. A plurality of rigid blocks 15 are provided in the positioning grooves. The rigid blocks 15 contact the first piezoelectric material layer 6. The central axis 4 is made of metal material, which has high hardness and strength and a small amplitude when vibrating. After the flexible sleeve 14 is provided on the outside of the central axis 4, the central axis 4 drives the flexible sleeve 14 to vibrate when vibrating, and the rigid blocks 15 vibrate with the flexible sleeve 14. The vibration movement can be regarded as a movement of a small distance. Since the flexible sleeve 14 has low strength and is easy to deform, when the flexible sleeve 14 moves a short distance in a certain direction and stops moving, the rigid blocks 15 will continue to move a short distance under the action of inertia, and at the same time pull the flexible sleeve 14 to deform. Therefore, the vibration amplitude of the rigid blocks 15 will be greater than the vibration amplitude of the flexible sleeve 14, thereby more effectively squeezing the first piezoelectric material layer 6 and ensuring the power generation effect of the first piezoelectric material layer 6. In addition, the elastic deformation of the flexible sleeve 14 itself can absorb the energy during vibration and optimize the shock absorption effect.

[0045] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A vibration-resistant milling cutter disc, comprising a cutter disc body (21), wherein the edge of the cutter disc body (21) is provided with a plurality of blades (23); Features: The circumferential surface of the cutter disc body (21) is provided with a plurality of radially extending blind holes (22), a mounting seat (24) is provided in the blind hole (22), one end of the mounting seat (24) extends out of the blind hole (22), and the blade (23) is mounted on the outer end of the mounting seat (24); The inner end of the mounting seat (24) is connected to a connecting column (25), a shock-absorbing sleeve (26) is arranged on the connecting column (25), end plates (27) are arranged at both ends of the shock-absorbing sleeve (26), and a plurality of through holes are arranged on the end plates (27) and the shock-absorbing sleeve (26); a shock-absorbing liquid (28) is filled between the inner end of the mounting seat (24) and the bottom of the blind hole (22), and the viscosity of the shock-absorbing liquid (28) is 0.1 Pa·s to 0.5 Pa·s.

2. The anti-vibration milling cutter disc according to claim 1, characterized in that: The diameters of the through holes on the end plate (27) and the shock-absorbing sleeve (26) are 0.1 to 0.2 mm.

3. The anti-vibration milling cutter disc according to claim 1, characterized in that: The shock-absorbing fluid (28) is silicone oil.

4. The anti-vibration milling cutter disc according to claim 1, characterized in that: The connecting column (25) is a heat dissipation pipe, the axial direction of the heat dissipation pipe is consistent with the radial direction of the blade disc body (21), the heat dissipation pipe comprises a heat absorption end (251), a tube body (252) and a heat release end (253) which are arranged in sequence, and the inner walls of the heat absorption end (251) and the heat release end (253) are provided with a capillary structure layer (255); the interior of the heat dissipation pipe is negative pressure, and the heat dissipation pipe is filled with a liquid medium; the blade disc body (21) is provided with a central blind hole (29), the heat absorption end (251) is embedded in the mounting seat (24), the heat release end (253) extends to the central blind hole (29), and the shock-absorbing sleeve (26) is located outside the tube body (252).

5. A milling cutter assembly, comprising a cutter bar (1) and the anti-vibration milling cutter disc (2) according to claim 1, wherein a shock absorbing cavity (3) is arranged inside the cutter bar (1), the anti-vibration milling cutter disc (2) is mounted on one end of the cutter bar (1), a center axis (4) is arranged on one end of the anti-vibration milling cutter disc (2), the center axis (4) extends into the shock absorbing cavity (3), and the center axis (4) is coaxial with the cutter bar (1); characterized in that: A positioning sleeve (5) is fixedly arranged in the shock absorbing cavity (3), the central axis (4) is located inside the positioning sleeve (5), and a first piezoelectric material layer (6) is arranged between the central axis (4) and the positioning sleeve (5); The side wall of the damping cavity (3) is provided with a plurality of strip holes, each of which is provided with an insulating mounting groove (7), each of which is provided with a Pettel effect sheet (8), the first piezoelectric material layer (6) is connected to a rectifier (9) via a wire, the rectifier (9) is connected to the Pettel effect sheet (8) via a wire, the heat absorbing end of the Pettel effect sheet (8) faces the damping cavity (3), and the heat releasing end of the Pettel effect sheet (8) faces outward.

6. The milling cutter assembly according to claim 5, characterized in that: The first piezoelectric material layer (6) is a polyvinylidene fluoride film.

7. The milling cutter assembly according to claim 5, characterized in that: The outer wall of the positioning sleeve (5) is provided with a plurality of radially extending sliding sleeves (10), the sliding sleeve (10) is provided with a pressure block (11) that slides with the sliding sleeve (10), the top of the sliding sleeve (10) is fixedly provided with a top plate (12), the inner side wall of the top plate (12) is provided with a second piezoelectric material layer (13), and the second piezoelectric material layer (13) is connected to the rectifier (9) through a wire; the side wall of the sliding sleeve (10) is provided with a plurality of air holes.

8. The milling cutter assembly according to claim 5, characterized in that: The central axis (4) is externally sheathed with a flexible sheath (14), the flexible sheath (14) is provided with a plurality of positioning grooves, a plurality of rigid blocks (15) are arranged in the positioning grooves, and the rigid blocks (15) contact the first piezoelectric material layer (6).

9. The milling cutter assembly according to claim 8, characterized in that: The flexible sleeve (14) is a rubber sleeve.

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