Dual-actuated super-magneto-elliptical vibration turning tool holder device

Abstract

The application discloses a double-excitation super-magnetic elliptical vibration turning tool rest device, which comprises amplitude rods and super-magnetic strain transducers, the amplitude rods are two, are arranged in a V shape and form an integrated structure, the integrated structure is provided with a tool blade mounting groove at the tail end, each amplitude rod is fixedly connected to the super-magnetic strain transducer, and the two super-magnetic strain transducers are connected to the tool rest through two clamping blocks respectively. The tool rest rod is formed by crossing two amplitude rods, the super-magnetic strain transducers are connected to the tail end respectively, the two super-magnetic strain transducers are controlled to realize the circular vibration track of the tool tip of the tool blade mounted on the tool rest rod, the turning tool body is integrated on the double amplitude rods crossed in a V shape, the transducer shell is mounted on the tool rest, the mechanical rigidity of the tool is improved, the ultrasonic energy transmission loss is reduced, and the machining performance is improved.

Description

Technical Field

[0001] This invention relates to a dual-excitation super magnetostrictive elliptical vibration turning tool holder device, belonging to the technical field of ultrasonic processing equipment. Background Technology

[0002] Ultrasonic machining is widely used in the processing of hard and brittle materials with low plasticity, which are difficult to machine. Ultrasonic transducers are mainly divided into piezoelectric transducers and magnetostrictive transducers according to their driving source. Piezoelectric ceramics are currently widely used excitation materials for ultrasonic transducers, but due to their low power density and shortcomings such as easy overheating failure and fragility, their application in high-power applications is limited.

[0003] Rare-earth giant magnetostrictive materials are newly developed materials with both positive and negative transduction effects. Their positive effect can be used to manufacture transducers. Compared to piezoelectric ceramic materials, they have advantages such as high load-bearing capacity, high reliability, stable performance, large electromechanical coupling coefficient, and fast speed response, making them a promising research direction for high-power, high-amplitude ultrasonic machining systems. However, due to the hysteresis and eddy current effects of giant magnetostrictive materials, and the fact that the excitation coils operate at high frequencies, a large amount of heat is generated, severely affecting the performance of the giant magnetostrictive transducers. Therefore, a reasonable cooling system must be designed to ensure normal system operation. Chinese patent application (application number 2013105522253) discloses a parallel dual-excitation ultrasonic elliptical vibration machining device. When mounted on a lathe, the device is too large, making it difficult to install on the lathe frame. Furthermore, parallel placement results in significant electromagnetic interference, easily leading to inaccurate control. Furthermore, placing them in the same housing means that the vibration of the housing itself can also cause mutual vibration interference. Summary of the Invention

[0004] The technical problem to be solved by the present invention is to provide a dual-excitation super magnetostrictive elliptical vibration turning tool holder device to solve the problems existing in the prior art.

[0005] The technical solution adopted in this invention is as follows: a dual-excitation super magnetostrictive elliptical vibration turning tool holder device, including an amplitude transformer and a super magnetostrictive transducer. The amplitude transformer consists of two rods arranged in a V-shape as an integral structure. An extended tool mounting groove is provided at the end of the integral structure. Each amplitude transformer is fixedly connected to the super magnetostrictive transducer. Two clamping blocks are fixedly connected to the inner side of the two super magnetostrictive transducers respectively. The two clamping blocks are fixedly connected to both sides of the turning tool holder respectively.

[0006] Preferably, the aforementioned magnetostrictive transducer includes a transducer housing, a magnetostrictive rod, an excitation coil, a permanent magnet, a magnetic guide block, and a rear cover plate. The front end of the transducer housing is fixedly connected to a flange in the middle of the amplitude transformer. Both ends of the magnetostrictive rod are sequentially fixedly connected to a permanent magnet and a magnetic guide block. The rear magnetic guide block is fixedly connected to the rear cover plate. The rear end of the rear cover plate abuts against the inner end of the rear end cover. The rear end cover is fixedly connected to the rear end of the transducer housing. The front magnetic guide block is fixedly connected to the inner end of the amplitude transformer. The magnetostrictive rod is placed in the through hole in the middle of the coil frame and maintains a gap with it. The coil frame is placed inside the magnetic guide cylinder and its two ends are pressed and fixed by two magnetic guide rings. The excitation coil is wound inside the coil frame. The magnetic guide cylinder and the two magnetic guide rings are fixedly connected inside the transducer housing. The two magnetic guide blocks, the two magnetic guide rings, and the magnetic guide cylinder form a closed magnetic circuit.

[0007] Preferably, the coil frame is an I-shaped grooved wheel with multiple heat dissipation grooves on the inner column in the middle.

[0008] Preferably, the clamping block has a circular hole 1 connected to the air conditioning device. The circular hole 1 is directly opposite to a circular hole 2 provided on the transducer housing. The circular hole 2 is located on one side of the rear cover plate. The rear cover plate and the transducer housing maintain a gap. This gap communicates with the gap at the wire frame. The gap at the wire frame communicates with the gap between the magnetostrictive rod and the coil frame. The transducer housing is provided with an air outlet, which communicates with the gap between the magnetostrictive rod and the coil frame.

[0009] Preferably, the rear end cover is abutted against the inner end of the rear end cover by a disc spring and is fixedly connected to the transducer housing by rear end cover screws.

[0010] Preferably, the inner end of the above-mentioned amplitude rod is provided with a limiting boss, the diameter of which is smaller than that of the magnetic guide ring, and the limiting boss is provided with a limiting groove for the limiting magnetic guide block.

[0011] Preferably, a positioning platform is provided at the location where the disc spring is mounted on the rear cover plate. The disc spring is sleeved on the positioning platform, and the outer diameter of the disc spring is slightly smaller than the inner diameter of the transducer housing at the corresponding location. The inner end of the rear cover is embedded in the inner hole of the transducer housing.

[0012] Preferably, the above-mentioned amplitude transformer has a conical structure with a large inner end and a small outer end. The two conical amplitude transformers intersect at a 60° angle. It is made of hard aluminum alloy with low acoustic impedance, and the permanent magnet is a neodymium iron boron permanent magnet.

[0013] Preferably, the clamping block has a straight slot 1, which is sequentially connected to a straight slot 2 on the side wall of the transducer housing and a straight slot 3 at the magnetic cylinder. The wire of the excitation coil passes through the straight slot 1, straight slot 2 and straight slot 3 and is then connected to the ultrasonic power supply.

[0014] Preferably, the blade tip is positioned slightly above the two transducer housings.

[0015] Preferably, the clamping block has a groove at a certain angle.

[0016] The beneficial effects of the present invention are as follows: Compared with the prior art, the present invention has the following advantages:

[0017] (1) This invention uses a tool holder rod formed by the intersection of two amplitude rods, and connects super magnetostrictive transducers at the rear ends. By controlling the two super magnetostrictive transducers, the tool tip of the blade mounted on the tool holder rod can form a circular vibration trajectory. The end of the amplitude rod is provided with a blade mounting groove and a threaded hole, which are connected by positioning screws to form a detachable connection. Different specifications of blades can be replaced, which effectively reduces the impact of blade replacement on the working performance of the tool holder rod. It has good versatility, high working efficiency, and low processing and use costs. The turning tool body is integrated on the double amplitude rods that cross into a V shape and installed on the tool holder with the transducer housing, which improves the mechanical rigidity of the tool and reduces the ultrasonic energy transmission loss, thereby improving the processing performance. The V-shaped double amplitude rod, compared with the vertical arrangement, The placement eliminates the machining length limitations caused by transducer size (oversized workpieces may collide with the transducers); compared to parallel arrangement, it reduces energy loss caused by hinges, and the independent housing installation avoids mutual interference between the two magnetostrictive transducers; it can change the phase difference of the excitation signal to generate different elliptical trajectories according to machining requirements, and the excitation amplitude is directly transmitted forward to the cutting tool according to the transducer arrangement direction (according to the included angle direction), reducing energy loss; the V-shaped double amplitude rod is installed on the frame through the housing, which is convenient and quick to install, with better installation reliability; the relatively small size of the installation point is more conducive to the stability of the magnetostrictive transducer after installation, avoiding the influence of excessive bias torque caused by excessive size, which affects the overall deformation of the cutting tool after being subjected to force.

[0018] (2) The transducer adopts a dual-excitation form. Specifically, the phase difference between the excitation power signals of the two transducers is adjusted by the phase shifter. According to the processing requirements, different elliptical vibration trajectories can be synthesized at the tip of the tool.

[0019] (3) The structure of the giant magnetostrictive transducer can provide stable vibration for the cutting tool. The excitation coil is wound inside the wire frame to provide an alternating excitation magnetic field for the giant magnetostrictive rod. Two magnetic blocks, two magnetic rings and a magnetic cylinder form a closed magnetic circuit to provide a closed magnetic circuit for the alternating excitation magnetic field generated by the excitation coil, increasing the magnetic flux through the cross section of the giant magnetostrictive rod and improving the utilization rate of the magnetic field. The permanent magnet provides a bias magnetic field to the giant magnetostrictive rod to eliminate the frequency doubling phenomenon.

[0020] (4) Multiple (six) heat dissipation grooves are provided on the coil frame. A gap is left between the coil frame and the giant magnetostrictive rod, and an air cooling system is used to cool the giant magnetostrictive rod and the coil. The heat dissipation grooves and gaps increase the heat dissipation area of ​​the giant magnetostrictive rod and the coil, and fully cool the giant magnetostrictive transducer, which can effectively solve the problem of heat generation of the giant magnetostrictive transducer in production and processing.

[0021] (5) The connected circular holes one and two, as well as the gap and the air outlet, together with the heat dissipation groove, allow the cooling gas to enter the transducer through the circular hole one on the clamping block, flow through the gap between the rear cover plate and the coil frame to the gap between the giant magnetostrictive rod and the coil frame, cool down the giant magnetostrictive rod and the excitation coil, and finally discharge through the air outlet on the transducer shell. This cooling system removes the hysteresis effect and eddy current effect of the giant magnetostrictive material and the large amount of heat generated by the excitation coil working at high frequency, so as to avoid affecting the performance of the giant magnetostrictive transducer and ensure the normal operation of the system.

[0022] (6) Set disc springs and rear end cover bolts, adjust the preload of the super magnetostrictive rod, provide preload for the super magnetostrictive rod, and press the rear cover plate, magnetic block, permanent magnet, super magnetostrictive rod and amplitude rod together to prevent the material from being subjected to tension or strain during operation, and at the same time increase the magnetostriction coefficient of the super magnetostrictive rod.

[0023] (7) The blade tip is positioned slightly higher than the two transducer housings, allowing the ultrasonic lathe tool to machine long shafts and large diameter end faces, thus broadening the application range of the ultrasonic lathe tool. Attached Figure Description

[0024] Figure 1 This is a schematic cross-sectional view of the super magnetostrictive elliptical vibration turning tool holder device;

[0025] Figure 2 This is a schematic diagram of the structure of a super magneto-elliptical vibration turning tool holder;

[0026] Figure 3 This is a schematic diagram of the three-dimensional structure of the super magnetostrictive elliptical vibration turning tool holder device;

[0027] Figure 4 This is a schematic diagram of the coil frame of the magnetostrictive elliptical vibration turning tool holder device;

[0028] Figure 5 This is a schematic diagram of the clamping block of the magnetostrictive elliptical vibration turning tool holder device;

[0029] Figure 6 This is a schematic diagram of elliptical vibration.

[0030] In the diagram, 1. Disc spring, 2. Transducer housing, 3. Magnetic cylinder, 4. Magnetostrictive rod, 5. Excitation coil, 6. Magnetic ring, 7. Permanent magnet, 8. Magnetic block, 9. Amplitude rod bolt, 10. Housing bolt, 11. Washer, 12. Set screw, 13. Blade, 14. Amplitude rod, 15. Circular hole one, 16. Rear end cover, 17. Rear cover plate, 18. Positioning groove, 19. Coil frame, 20. Ultrasonic power supply, 21. Clamping block, 22. Rear end cover bolt, 23. Heat dissipation groove, 24. Circular hole two, 25. Straight slot one, 26. Straight slot two, 27. Straight slot three, 28. Air outlet. Detailed Implementation

[0031] The present invention will be further described below with reference to the accompanying drawings and specific embodiments.

[0032] Example 1: As Figures 1-6 As shown, a dual-excitation super-magnetic-strict elliptical vibration turning tool holder device includes amplitude transformers 14 and super-magnetic-strict transducers. Two amplitude transformers 14 are arranged in a V-shape as a single unit. An extended tool mounting slot for mounting the cutting tool 13 is provided at the end of the unit. Each amplitude transformer 14 is fixedly connected to a super-magnetic-strict transducer. The inner sides of the two super-magnetic-strict transducers are respectively fixedly connected to the tool holder (the clamping blocks are locked on both sides of the tool holder body using locking screws) via two clamping blocks 21. The transducers in both directions are connected to an ultrasonic power supply. By adjusting the phase difference between the power signals of the two transducers, an elliptical vibration trajectory is synthesized at the tool tip position.

[0033] The governing equations for the two supermagnetostrictive transducers conform to the following formula:

[0034]

[0035] In the formula, x ( t )and y ( t Let A and B be the vibration trajectory functions of the magnetostrictive transducers in two directions, and let A and B be the amplitudes of the two magnetostrictive transducers. f The vibration frequency, The phase difference angle, and the elliptical vibration curves obtained from the two supermagnetostrictive transducers are as follows: Figure 6 As shown.

[0036] The super magnetostrictive transducer includes a transducer housing 2, a super magnetostrictive rod 4, an excitation coil 5, a permanent magnet 7, a magnetic guide block 8, and a rear cover plate 17. The front end of the transducer housing 2 is fixedly connected to the flange in the middle of the amplitude transformer 14. Both ends of the super magnetostrictive rod 4 are sequentially fixedly connected from the inside to the outside using epoxy resin adhesive. The rear magnetic guide block 8 is fixedly connected to the rear cover plate 17. The rear end of the rear cover plate 17 abuts against the inner end of the rear end cover 16 via a disc spring 1. The rear end cover 16 is fixedly connected to the rear end of the transducer housing 2. The front magnetic guide block 8 is fixedly connected to the inner end of the amplitude transformer 14. The super magnetostrictive rod 4 is placed in the through hole in the middle of the coil frame 19 with a gap between it and the frame. The coil frame 19 is an I-shaped grooved wheel with multiple heat dissipation grooves 23 in the middle inner column to increase the contact area between the coil and the air. The transducer is cooled by air within the transducer. The air duct cools the magnetostrictive rod 4 and the excitation coil 5. The wire frame 19 is placed inside the magnetic cylinder 3 and its two ends are pressed and fixed by two magnetic rings 6. The excitation coil 5 is wound inside the wire frame 19 to provide an alternating excitation magnetic field for the magnetostrictive rod 4. The magnetic cylinder 3 and the two magnetic rings 6 are fixedly connected inside the transducer housing 2. The magnetic blocks 8, magnetic rings 6, and magnetic cylinder 3 are made of electrical pure iron. The two magnetic blocks 8, two magnetic rings 6, and magnetic cylinder 3 form a closed magnetic circuit, providing a closed magnetic circuit for the alternating excitation magnetic field generated by the excitation coil 5, increasing the magnetic flux through the cross section of the magnetostrictive rod 4, and improving the utilization rate of the magnetic field. The magnetic cylinder 3 is bonded to the transducer housing 2 with epoxy resin. The neodymium iron boron permanent magnet 7 provides a bias magnetic field to the magnetostrictive rod 4 to eliminate the frequency doubling phenomenon. The rear cover plate 17 is made of 45 steel, and the amplitude transformer 14 is made of hard aluminum alloy with low acoustic impedance.

[0037] To ensure precise positioning and rapid installation, a limiting boss is provided at the inner end of the amplitude rod 14. The diameter of the limiting boss is less than or equal to the inner diameter of the magnetic guide ring 6, and the limiting boss is provided with a limiting groove for the limiting magnetic guide block 8.

[0038] To improve heat dissipation, a circular hole 15 is provided on the clamping block 21, which connects to a cooling device. A corresponding circular hole 24 is provided on the transducer housing 2, directly opposite the circular hole 15. The circular hole 24 is located on one side of the rear cover plate 17, which maintains a gap with the transducer housing 2. This gap communicates with the gap at the wire frame 19, which in turn communicates with the gap between the super magnetostrictive rod 4 and the coil frame 19. An air outlet 28 is provided on the transducer housing 2, located on the side of the inner end of the amplitude transformer corresponding to the transducer housing 2. The air outlet 28 connects to the super magnetostrictive rod 4. The gap between the magnetostrictive rod 4 and the coil frame 19, along with the heat dissipation groove, allows cooling gas to enter the transducer through a circular hole on the clamping block 21. The gas then flows through the gap between the rear cover plate 17 and the coil frame 19 to the gap between the magnetostrictive rod 4 and the coil frame 19, cooling the magnetostrictive rod 4 and the excitation coil 5. Finally, the gas is discharged through the air outlet 28 on the transducer housing 2. This cooling system removes the hysteresis and eddy current effects of the magnetostrictive material, as well as the large amount of heat generated by the excitation coil operating at high frequencies, thus avoiding any impact on the performance of the magnetostrictive transducer and ensuring the normal operation of the system.

[0039] A disc spring 1 is provided between the rear cover plate 17 and the rear end cover 16. A raised truncated cone (i.e., positioning platform) is provided on the end face of the rear cover plate 17 to fix the position of the disc spring 1. The outer diameter of the disc spring 1 is slightly smaller than the inner diameter of the transducer housing 2 at the corresponding location. The inner end of the rear end cover 16 is embedded in the inner hole of the transducer housing 2. The rear end cover 16 is fixed to the rear end of the transducer housing 2 by the rear end cover bolt 22. The preload is adjusted by the rear end cover bolt 22 to provide preload for the super magnetostrictive rod 4, so that the rear cover plate 17, the magnetic block 8, the permanent magnet 7, the super magnetostrictive rod 4 and the amplitude rod 14 are pressed together to prevent the materials from being subjected to tension or strain during operation, and at the same time, it can increase the magnetostriction coefficient of the super magnetostrictive rod 4. The amplitude rod 14 adopts a 1 / 4 wavelength design, and its maximum diameter does not exceed 1 / 4 of its wavelength. The amplitude rod 14 is equipped with a flange, which is fixed to the transducer housing 2 through bolt holes on the flange, gasket 11 and amplitude rod bolt 9. The rear end cover 16 is fixed between the transducer housing 2 and a sealing gasket.

[0040] Preferably, the clamping block 21 has a straight slot 25, which is sequentially connected to a straight slot 26 on the side wall of the transducer housing 2 and a straight slot 3 27 on the magnetic cylinder 3. The wire of the excitation coil 5 passes through the straight slot 25, the straight slot 26 and the straight slot 3 27 and is connected to the ultrasonic power supply 20.

[0041] The aforementioned clamping block 21 is used to mount the ultrasonic lathe tool on the lathe tool post. The clamping block 21 is directly clamped by the tool post, making installation convenient. The transducer housing 2 has a positioning groove 18 for the positioning clamping block 21. For any one of the transducers, the positioning groove fixes the position of the clamping block 21 tangentially along the outer surface of the transducer. The clamping block 21 is fixed by three housing bolts 10. The clamping block 21 is provided with countersunk holes for mounting the housing bolts 10. The surface of the clamping block 21 has a groove at a certain angle. After the ultrasonic lathe tool is installed as a whole, the two grooves on the two clamping blocks 21 are at 90°, ensuring that the relative position is fixed when fixed to the tool post.

[0042] The amplitude transformer 14 has a tapered structure, with a larger inner end and a smaller outer end. The two tapered amplitude transformers intersect at a 60° angle and are made of hard aluminum alloy with low acoustic impedance. The ends of the two amplitude transformers 14 extend to have mounting slots for blades 13 and positioning screw holes. The cutting tool blades 13 are directly fixed to the amplitude transformers 14 using set screws 12, reducing ultrasonic energy loss. The set screws 12 also enable detachable connection of the blades 13, allowing for replacement with new blades 13 after wear, minimizing the impact of replacing parts on the transducer's operating frequency. Different specifications of blade mounting slots and positioning screw holes can be provided according to actual application requirements to accommodate blades 13 of different sizes, improving the versatility of the ultrasonic cutting tool and reducing production costs. The blade tip of the blade 13 is slightly higher than the two transducer housings 2, allowing the ultrasonic cutting tool to machine long shafts and large-diameter end faces, thus broadening its application range.

[0043] The present invention provides a dual-excitation super magnetostrictive elliptical vibration turning tool holder device, which can effectively solve the problems of super magnetostrictive transducer overheating and tool replacement in actual machining.

[0044] The above description is merely a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in the present invention should be included within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by the scope of protection of the claims.

Claims

1. A dual-actuated magneto-elliptical vibration turning tool holder device, characterized by: The application relates to a tool holder with a variable amplitude rod (14) and super magnetostrictive transducers, wherein the variable amplitude rod (14) is arranged in a V shape and is formed as an integral structure, the integral structure is provided with an extended tool blade mounting groove at the end, each variable amplitude rod (14) is fixedly connected to a super magnetostrictive transducer, the inner sides of the two super magnetostrictive transducers are respectively fixedly connected with two clamping blocks (21), the two clamping blocks (21) are respectively fixedly connected to the two sides of a tool holder, the variable amplitude rod (14) is a conical structure, the inner end is large, the outer end is small, the two conical variable amplitude rods are crossed at an angle of 60 DEG, the variable amplitude rod (14) is made of hard aluminum alloy, and the permanent magnet (7) is made of a neodymium iron boron permanent magnet; the tool blade (13) is slightly higher than the outer shells (2) of the two transducers at the tool tip position; the two super magnetostrictive transducers can realize circular vibration track of the tool tip of the tool blade installed on the tool holder rod, and the control equation of the two super magnetostrictive transducers is as follows: ， where x(t) and y(t) are the vibration trajectory functions of the magnetostrictive transducers in two directions, A and B are the amplitudes of the two magnetostrictive transducers, f is the vibration frequency, phase difference angle; The super magnetostrictive transducer comprises a transducer shell (2), a super magnetostrictive rod (4), an exciting coil (5), a permanent magnet (7), a magnetic conducting block (8) and a rear cover plate (17), the front end of the transducer shell (2) is fixedly connected with a flange plate at the middle of the variable amplitude rod (14), the two ends of the super magnetostrictive rod (4) are sequentially fixedly connected with the permanent magnet (7) and the magnetic conducting block (8), the rear magnetic conducting block (8) is fixedly connected to the rear cover plate (17), the rear end of the rear cover plate (17) abuts against the inner end of the rear end cover (16), the rear end cover (16) is fixedly connected to the rear end of the transducer shell (2), the front magnetic conducting block (8) is fixedly connected to the inner end of the variable amplitude rod (14), the super magnetostrictive rod (4) is arranged in a through hole in the middle of a coil frame (19) and keeps a gap with the coil frame (19), the coil frame (19) is arranged in a magnetic conducting cylinder (3) and is tightly fixed at the two ends through two magnetic conducting rings (6), the exciting coil (5) is wound on the coil frame (19), the magnetic conducting cylinder (3) and the two magnetic conducting rings (6) are fixedly connected in the transducer shell (2), and the two magnetic conducting blocks (8), the two magnetic conducting rings (6) and the magnetic conducting cylinder (3) form a closed magnetic loop. The coil frame (19) is in the shape of an I-shaped groove wheel, and a plurality of heat dissipation grooves (23) are arranged in the middle inner column. A circular hole one (15) is formed in the clamping block (21) and is connected to a cold air equipment, the circular hole one (15) is opposite to a circular hole two (24) arranged on the transducer shell (2), the circular hole two (24) is located on one side of the rear cover plate (17), the rear cover plate (17) keeps a gap with the transducer shell (2), the gap is communicated with a gap at the coil frame (19), the gap at the coil frame (19) is communicated with a gap between the super magnetostrictive rod (4) and the coil frame (19), and the transducer shell (2) is provided with an air outlet (28) communicated with the gap between the super magnetostrictive rod (4) and the coil frame (19).

2. A dual actuated MET cantilever tool holder device according to claim 1, wherein: The rear end cover (16) abuts against the inner end of the rear end cover (16) through a disc spring (1) and is fixedly connected to the transducer shell (2) through a rear end cover screw (22).

3. The dual actuated MET carver holder apparatus of claim 1, wherein: The inner end of the variable amplitude rod (14) is provided with a limiting boss, the limiting boss has a diameter smaller than the magnetic conducting ring (6), and the limiting boss is provided with a limiting groove for limiting the magnetic conducting block (8).

4. The dual actuated MET carver holder apparatus of claim 1, wherein: The back cover plate (17) is provided with a positioning platform at the installation position of the disc spring (1), the disc spring (1) is sleeved on the positioning platform, the outer diameter of the disc spring (1) is slightly smaller than the inner diameter of the transducer shell (2) at the corresponding position, and the inner end of the rear end cover (16) is embedded into the inner hole of the transducer shell (2).

5. A dual actuated MET cantilever tool holder device according to any one of claims 2-4, characterized in that: A straight slot one (25) is formed on the clamping block (21), the straight slot one (25) is sequentially connected to a straight slot two (26) arranged on the side wall of the transducer shell (2) and a straight slot three (27) at the magnetic conducting cylinder (3), and the wires of the excitation coil (5) are connected to the ultrasonic power supply (20) after passing through the straight slot one (25), the straight slot two (26) and the straight slot three (27).

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