A pre-tightened ultrasonic torsional vibration tool holder

Abstract

This invention relates to a pre-tightened ultrasonic torsional vibration tool holder, comprising a tool housing, a torsional vibration amplitude transformer, ultrasonic transducers, a wireless power transmission unit, and a cutting tool. The upper part of the tool housing includes a machine tool spindle interface, and the lower part has a receiving cavity. The torsional vibration amplitude transformer is stepped, including a large-diameter section, a small-diameter section, and a mounting flange. The mounting flange is fixedly connected to the lower end of the tool housing via a connecting unit, and the large-diameter section is located in the receiving cavity. The cutting tool is fixedly attached to the outer end of the small-diameter section. The vibrations of i ultrasonic transducers fixedly connected to the large-diameter section of the torsional vibration amplitude transformer are superimposed to generate an excitation along the circumferential direction of the torsional vibration amplitude transformer. Two pre-tightening bolts are screwed onto the tool housing to apply a pre-tightening force F to the countersinking plane B. The direction of the torque M formed by the pre-tightening force F on the torsional vibration amplitude transformer is consistent with the direction of the superposition of the vibrations of the i ultrasonic transducers. The wireless power transmission unit is fixedly mounted on the machine tool spindle and electrically connected to the ultrasonic transducers. This technical solution provides stable output amplitude, high power conversion, and low energy dissipation.

Description

Technical Field

[0001] This invention belongs to the field of ultrasonic vibration processing technology, and specifically relates to a pre-tightened ultrasonic torsional vibration tool holder. Background Technology

[0002] With the continuous development and progress of machining technology, the demand for high precision, high strength and lightweight miniaturization is increasing. This means that more and more new materials are being invented and applied in aerospace, medical equipment and other fields. However, while these new materials have excellent performance, they also have processing difficulties, especially for machining deep holes with large aspect ratios and threading.

[0003] Ultrasonic machining technology, as an advanced cutting technology, has advantages such as low cutting force, low cutting temperature, and high machining quality. Ultrasonic torsional vibration machining refers to applying ultrasonic torsional vibration to the cutting tool, with the direction of ultrasonic vibration consistent with the rotation direction of the tool and the direction of the main cutting force on the cutting edge of the tool.

[0004] Currently, there are two main ways to realize ultrasonic torsional vibration devices: one is to generate torsional ultrasonic vibration by using piezoelectric ceramic plates with tangential polarization. This method has a complex manufacturing process, a high scrap rate, and the piezoelectric ceramic plates have a small power capacity, making it difficult to achieve high-power, large-amplitude torsional ultrasonic vibration output. The second method is to use a special structural design for the amplitude transformer to generate torsional vibration. This type of vibration system has low longitudinal-torsional efficiency and a very small torsional amplitude.

[0005] In the machining of deep holes and threads with large aspect ratios in difficult-to-machine materials, the cutting resistance and harsh machining environment can inhibit the output of ultrasonic vibrations due to the high cutting resistance. Therefore, ultrasonic torsional vibration tool holders are needed to generate output amplitudes with high transmission efficiency and strong stability to ensure that the machining produces significant results. Summary of the Invention

[0006] The technical problem to be solved by the present invention is to overcome the shortcomings of the prior art and provide a pre-tightened ultrasonic torsional vibration tool holder.

[0007] To solve the above-mentioned technical problems, the technical solution of the present invention is as follows:

[0008] A pre-tightened ultrasonic torsional vibration tool holder includes a tool housing, a torsional vibration amplitude transformer, an ultrasonic transducer, a wireless power transmission unit, and a tool.

[0009] The upper part of the tool housing includes a machine tool spindle interface for connecting to a machine tool spindle; the lower part of the tool housing is provided with a receiving cavity.

[0010] The torsional vibration amplitude transformer is stepped, consisting of a large-diameter section, a small-diameter section, and a mounting flange. The mounting flange is fixedly connected to the lower end of the cutter housing via a connecting unit, and the large-diameter section is located in the receiving cavity, while the cutter is fixed at the outer end of the small-diameter section.

[0011] The number of ultrasonic transducers is i, i≥2. The i ultrasonic transducers are uniformly arrayed around the central axis of the torsional vibration amplitude transformer and are fixedly connected to the large diameter part of the torsional vibration amplitude transformer. The vibration of the i ultrasonic transducers is superimposed to form an excitation along the circumferential direction of the torsional vibration amplitude transformer.

[0012] The torsional vibration amplitude transformer and the cutting tool are based on resonance of λ / 4 and its multiples, where λ is the wavelength of the sound wave propagating in the torsional vibration amplitude transformer. The distance between the mounting surface A of the mounting flange and the outer end of the large-diameter section is nλ / 4, where n is a positive even number; the distance between the central axis of the ultrasonic transducer and the outer end of the large-diameter section is mλ / 4, where m is a positive odd number; the distance between the end of the cutting tool and the outer end of the large-diameter section is jλ / 4, where j is a positive odd number and j > m.

[0013] Two countersunk surfaces B are provided on the outer end of the torsional vibration amplitude transformer near the large diameter section. The two countersunk surfaces B are located on the outer circumference of the large diameter section and are evenly distributed around the central axis of the large diameter section. The countersunk surfaces B are parallel to the central axis of the large diameter section. Two preload bolts are screwed onto the blade housing. The ends of the two preload bolts contact the two countersunk surfaces B one by one and apply a preload force F to the countersunk surfaces B. The direction of the torque M formed by the preload force F on the torsional vibration amplitude transformer is consistent with the direction of the superposition of the vibrations of the i ultrasonic transducers.

[0014] The wireless power transmission unit is fixedly mounted on the machine tool spindle and electrically connected to the ultrasonic transducer.

[0015] Furthermore, the mounting flange and the blade housing are fixedly connected as follows: the mounting flange is provided with several through holes, and the lower end of the blade housing is provided with several threaded holes accordingly. The connecting unit is a number of screws or bolts. The connecting unit passes through the through holes and is screwed into the threaded holes, so that the mounting flange and the blade housing are fixedly connected.

[0016] Furthermore, a circular groove is machined at the lower end of the blade housing, and the bottom of the circular groove fits into the mounting surface B of the mounting flange.

[0017] Furthermore, i countersunk holes are uniformly arrayed on the outer circumference of the large-diameter portion of the torsional vibration amplitude transformer. Each countersunk hole includes a countersunk plane A and a screw hole. The countersunk plane A is parallel to the central axis of the torsional vibration amplitude transformer. Each of the i ultrasonic transducers corresponds to one of the i countersunk holes. The ultrasonic transducers are fixedly connected to the screw holes by bolts, and the mounting end face of the ultrasonic transducer is in contact with the countersunk plane A.

[0018] Furthermore, the preload bolt is screwed to the cutter housing through a countersunk threaded through hole provided on the cutter housing.

[0019] Furthermore, the wireless power transmission unit includes a primary power transmitting side, a secondary power receiving side, an input wire, and an output wire. The primary power transmitting side is fixedly connected to the machine tool spindle, the secondary power receiving side is fixedly connected to the tool housing, the input wire is electrically connected to the ultrasonic power supply, and the output wire is electrically connected to the ultrasonic transducer.

[0020] Furthermore, the blade housing is provided with a wire-passing hole for the output wire to pass through.

[0021] Furthermore, the lower end of the torsional vibration amplitude rod is provided with a tapered hole, and the outer circumference of the lower end of the torsional vibration amplitude rod is provided with an external thread. The mounting end of the cutter is inserted into a standard spring collet, the standard spring collet is inserted into the tapered hole, and the pressure cap presses the outer end of the standard spring collet and screws it into the external thread.

[0022] Furthermore, the machine tool spindle interface is of the BT40 specification.

[0023] The beneficial effects that this invention can achieve are as follows:

[0024] (1) Applying a preload torque to the torsional vibration amplitude transformer using a pair of preload bolts can improve the overall torsional stiffness of the tool holder system. On the one hand, the preload torque can eliminate the gap at the installation interface, so that the excitation torque applied by the ultrasonic transducer to the torsional vibration amplitude transformer will be used entirely for the torsional deformation of the torsional vibration amplitude transformer, avoiding the frictional loss of vibration energy at the assembly point. On the other hand, after applying the preload torque, the torsional vibration amplitude transformer will directly skip the nonlinear deformation stage and enter the elastic deformation stage during ultrasonic vibration. The ultrasonic waves are transmitted through the elastic deformation of the particles inside the torsional vibration amplitude transformer, and the reciprocating rotation amplitude of the particles remains consistent, which makes the output amplitude of the torsional vibration amplitude transformer more stable.

[0025] (2) Apply a preload torque to the torsional vibration amplitude rod so that the ultrasonic torsional vibration tool holder can reduce the loss of ultrasonic waves, achieve high power conversion, low energy dissipation and stable ultrasonic waves, and improve the actual processing difficulties such as drilling deep holes with large length-to-diameter ratio and thread processing. Attached Figure Description

[0026] Figure 1 This is a perspective view of an embodiment of the present invention.

[0027] Figure 2 This is a cross-sectional view of an embodiment of the present invention.

[0028] Figure 3 yes Figure 2 AA sectional view.

[0029] Figure 4 This is a structural diagram of the torsional vibration amplitude transformer in an embodiment of the present invention.

[0030] Figure 5 yes Figure 4 BB cross-sectional view.

[0031] Figure 6 This is a structural diagram of the blade shell in an embodiment of the present invention.

[0032] Figure 7 yes Figure 6 CC section view.

[0033] Figure 8 This is a schematic diagram of the assembly structure of the torsional vibration amplitude transformer, ultrasonic transducer, preload bolt, pressure cap and cutting tool in an embodiment of the present invention.

[0034] Figure 9 This is a schematic diagram showing the correspondence between the installation positions of the ultrasonic transducer, preload bolt, pressure cap, and cutting tool on the torsional vibration amplitude transformer and the wavelength of ultrasonic torsional resonance vibration in an embodiment of the present invention.

[0035] Figure 10 This is a schematic diagram of the state of the torsional vibration amplitude transformer under the action of the preload bolt in an embodiment of the present invention;

[0036] Figure 11 This is a schematic diagram of the structure of the wireless power transmission unit in an embodiment of the present invention.

[0037] Figure 12 It is the torque T and the angular displacement of the torsional vibration amplitude transformer. The curve showing the relationship between the changes.

[0038] Figure 13 It is the torsional amplitude curve of the torsional vibration amplitude transformer output when no preload torque is applied.

[0039] Figure 14 It is the torsional amplitude curve output by the torsional vibration amplitude transformer when a preload torque is applied.

[0040] In the diagram: 1-Tool housing, 101-Machine tool spindle interface, 102-Through hole, 103-Counterhead threaded through hole, 104-Threaded hole, 105-Circular groove, 106-Receiving cavity, 2-Torsion vibration amplitude transformer, 201-Mounting flange, 2011-Mounting surface A, 2012-Mounting surface B, 202-Tapered hole, 203-External thread, 204-Counterhead hole, 2041-Counterhead surface A, 2042 - Screw hole, 205- Countersunk plane B, 206- Through hole, 207- Large diameter section, 208- Small diameter section, 3- Ultrasonic transducer, 4- Preload bolt, 5- Connecting unit, 6- Wireless power transmission unit, 601- Primary side for power transmission, 602- Secondary side for power reception, 603- Input wire, 604- Output wire, 7- Standard spring collet, 8- Pressure cap, 9- Cutting tool, 10- Ultrasonic power supply. Detailed Implementation

[0041] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments.

[0042] A pre-tightened ultrasonic torsional vibration tool holder includes a tool housing 1, a torsional vibration amplitude transformer 2, an ultrasonic transducer 3, a wireless power transmission unit 6, and a tool 9.

[0043] The upper part of the tool housing 1 includes a machine tool spindle interface 101, which is of BT40 specification and is used to connect to the machine tool spindle; the lower part of the tool housing 1 is provided with a receiving cavity 106.

[0044] The torsional vibration amplitude rod 2 is stepped and includes a large diameter section 207, a small diameter section 208 and a mounting flange 201. The mounting flange 201 is fixedly connected to the lower end of the blade housing 1 through the connecting unit 5, and the large diameter section 207 is located in the receiving cavity 106, and the blade 9 is fixed at the outer end of the small diameter section 208.

[0045] The mounting flange 201 and the knife housing 1 are fixedly connected as follows: the mounting flange 201 has 8 through holes 206 evenly distributed around its circumference, and the lower end of the knife housing 1 has 8 threaded holes 104 correspondingly. The connecting unit 5 consists of several screws or bolts. The connecting unit 5 passes through the through holes 206 and is screwed into the threaded holes 104 to fix the mounting flange 201 and the knife housing 1. The lower end of the knife housing 1 is machined with a circular groove 105. The bottom of the circular groove 105 fits against the mounting surface B2012 of the mounting flange 201.

[0046] The fixed connection between the cutting tool 9 and the torsional vibration amplitude rod 2 is as follows: the lower end of the torsional vibration amplitude rod 2 is provided with a tapered hole 202, the outer circumference of the lower end of the torsional vibration amplitude rod 2 is provided with an external thread 203, the mounting end of the cutting tool 9 is inserted into a standard spring collet 7, the standard spring collet 7 is inserted into the tapered hole 202, and the pressure cap 8 presses the outer end of the standard spring collet 7 and screws it into the external thread 203.

[0047] There are two ultrasonic transducers 3. The two ultrasonic transducers 3 are evenly arrayed around the central axis of the torsional vibration amplitude transformer 2 and are fixedly connected to the large diameter part 207 of the torsional vibration amplitude transformer 2. The vibration of the two ultrasonic transducers 3 is superimposed to generate excitation along the circumferential direction of the torsional vibration amplitude transformer 2.

[0048] The ultrasonic transducer 3 is fixedly connected to the torsional vibration amplitude transformer 2 as follows: two countersunk holes 204 are uniformly arrayed on the outer circumference of the large diameter part 207 of the torsional vibration amplitude transformer 2. The countersunk holes 204 include a countersunk plane A2041 and a screw hole 2042. The countersunk plane A2041 is parallel to the central axis of the torsional vibration amplitude transformer 2. The two ultrasonic transducers 3 correspond one-to-one with the two countersunk holes 204. The ultrasonic transducers 3 are fixedly connected to the screw hole 2042 by bolts, and the mounting end face of the ultrasonic transducer 3 is in close contact with the countersunk plane A2041.

[0049] The torsional vibration amplitude transformer 2 and the cutting tool 9 are based on resonance of λ / 4 and its multiples, where λ is the wavelength of the sound wave propagating in the torsional vibration amplitude transformer 2. The distance between the mounting surface A2011 of the mounting flange 201 and the outer end of the large diameter section 207 is nλ / 4, where n is a positive even number. The distance between the central axis of the ultrasonic transducer 3 and the outer end of the large diameter section 207 is mλ / 4, where m is a positive odd number. The distance between the machining end of the cutting tool 9 and the outer end of the large diameter section 207 is jλ / 4, where j is a positive odd number and j > m. The values ​​of n, m, and j need to be determined based on the actual design length of the torsional vibration amplitude transformer 2 and the design length of the cutting tool 9.

[0050] Ultrasonic waves have antinodes and nodes at resonance. Vibration is greatest at antinodes and least at nodes. Odd multiples of λ / 4 are antinodes, and even multiples of λ / 4 are nodes. Since the ultrasonic transducer 3 is located at an antinode, it more easily excites the inherent torsional vibration mode of the torsional amplitude transformer 2, achieving ultrasonic torsional vibration of the torsional amplitude transformer 2, and applying this ultrasonic torsional vibration to the tool 9. The machining end of the tool 9 is located at an antinode in the ultrasonic torsional resonance mode, allowing the tool tip to achieve the maximum amplitude. The mounting surface A2011 of the mounting flange 201 is located at a node, resulting in minimal vibration.

[0051] Two countersunk surfaces B205 are provided on the torsional vibration amplitude rod 2 near the outer end of the large diameter section 207. The two countersunk surfaces B205 are located on the outer circumference of the large diameter section 207 and are evenly distributed around the central axis of the large diameter section 207. The countersunk surfaces B205 are parallel to the central axis of the large diameter section 207. The blade housing 1 is provided with two countersunk threaded through holes 103. Each countersunk threaded through hole 103 is screwed with a preload bolt 4. The ends of the two preload bolts 4 contact the two countersunk surfaces B205 one by one and apply a preload force F to the countersunk surfaces B205. The direction of the torque M formed by the preload force F on the torsional vibration amplitude rod 2 is consistent with the direction of the superposition of the vibrations of the two ultrasonic transducers 3.

[0052] The wireless power transmission unit 6 includes a primary power transmitting side 601, a secondary power receiving side 602, an input wire 603, and an output wire 604. The primary power transmitting side 601 is fixedly connected to the machine tool spindle, and the secondary power receiving side 602 is fixedly connected to the tool housing 1. The ultrasonic power supply 10 transmits the generated high-frequency electrical signal to the primary power transmitting side 601 through the input wire 603, and then transmits it to the secondary power receiving side 602 through inductive coupling. The secondary power receiving side 602 transmits the high-frequency electrical signal to the ultrasonic transducer through the output wire 604. 3. Power is supplied to the ultrasonic transducer 3. Based on the piezoelectric inverse effect of the piezoelectric ceramic sheet in the ultrasonic transducer 3, the electrical signal is converted into high-frequency mechanical vibration. The ultrasonic transducer 3 simultaneously applies longitudinal ultrasonic vibration excitation in the tangential direction at the circumference of the large diameter portion 207 of the torsional amplitude transformer 2. The longitudinal ultrasonic vibration can be coupled into torsional vibration in the circumferential direction, thereby exciting the inherent torsional mode of the torsional amplitude transformer 2, realizing ultrasonic torsional vibration of the torsional amplitude transformer 2. The ultrasonic vibration is proportionally amplified and transmitted to the tool 9 through the stepped structure of the torsional amplitude transformer 2. The through hole 102 is used to allow the output wire 604 to pass through.

[0053] During the assembly process, there will be unavoidable installation errors between the torsional vibration amplitude transformer 2 and the blade housing 1. There will be a gap at the mounting interface between the connecting unit 5 and the through hole 206, causing a rotation angle between the torsional vibration amplitude transformer 2 and the blade housing 1. The relative rotation of the components affects the overall torsional stiffness c of the toolholder system. For example... Figure 12 As shown, due to the existence of relative rotation, when the torsional vibration amplitude rod 2 is subjected to an external force, the external torque T applied to the amplitude rod and the rotational angular displacement of the amplitude rod are related. The curve (torsional deformation of the torsional vibration amplitude transformer 2) is nonlinear, as shown in region I. The reason for the existence of the nonlinear deformation stage is that the applied external force simultaneously causes the torsional vibration amplitude transformer 2 to undergo relative rotation with the cutter housing 1 and torsional deformation of itself. This results in the torque T and the rotational angular displacement of the torsional vibration amplitude transformer 2. The relationship between the changes (torsional deformation of the amplitude transformer 2) is nonlinear. Ultrasonic vibration is a small deformation process; when no preload torque is applied, the amplitude transformer will undergo torsional ultrasonic vibration in the nonlinear deformation stage. It can be seen that the greater the slope, the greater the stiffness. At this stage, the overall torsional stiffness c of the toolholder system is relatively small. Furthermore, it is in the inelastic range. During the transmission of torsional ultrasonic waves in the torsional vibration amplitude transformer 2, high-frequency friction will be generated at the assembly interface, resulting in high vibration energy dissipation and poor stability of ultrasonic wave transmission in the torsional vibration amplitude transformer 2.

[0054] When a preload torque M is applied to the large diameter portion 207 of the torsional vibration amplitude transformer 2, the preload torque can tighten the torsional vibration amplitude transformer 2, eliminating the relative rotation angle between the torsional vibration amplitude transformer 2 and the cutter housing 1. Furthermore, the excitation torque applied by the ultrasonic transducer 3 to the torsional amplitude transformer 2 will be entirely used for the torsional deformation of the torsional amplitude transformer 2, allowing the torsional deformation of the torsional amplitude transformer 2 to directly skip the nonlinear deformation stage and enter the elastic deformation stage, such as... Figure 12 As shown in region II, at this point, the overall torsional stiffness of the tool holder system is relatively large. The elimination of relative rotation avoids frictional loss of vibration energy at the assembly point. It can be seen that the overall torsional stiffness of the tool holder system When the damping ratio increases, This will decrease, and friction and vibration dissipation will be reduced, among which, The damping coefficient of the system is... For the quality of the system. Furthermore... Increasing the value will decrease the vibration damping coefficient. .Depend on It can be seen that reducing the vibration damping coefficient It can increase the distance the amplitude propagates. ,in, The propagation distance is Amplitude at time This is the initial amplitude. During the elastic deformation stage, the ultrasonic wave is transmitted through the elastic deformation of the particles inside the torsional vibration amplitude transformer 2. The reciprocating rotation amplitude of the particles remains consistent, i.e. This makes the output amplitude of the torsional vibration amplitude transformer 2 more stable.

[0055] The amplitude of the output end of the torsional vibration amplitude transformer 2 was simulated using Abaqus simulation software with and without preload torque. The simulation results are as follows: Figure 13 and Figure 14 As shown.

[0056] It can be seen that when no preload torque is applied, the torsional amplitude (represented by the tangential displacement of a point on the circumference) output by the torsional vibration transformer 2 is unstable in mode shape and the maximum amplitude value is only 6µm. Figure 13 As shown.

[0057] After applying the preload torque, the amplitude output by the torsional vibration amplitude transformer 2 is relatively stable and the maximum amplitude value can reach 10um, such as Figure 14 As shown.

Claims

1. A pre-tightened ultrasonic torsional vibration tool holder, characterized in that: It includes a blade housing (1), a torsional vibration amplitude transformer (2), an ultrasonic transducer (3), a wireless power transmission unit (6), and a cutting tool (9); The upper part of the tool housing (1) includes a machine tool spindle interface (101), which is used to connect to the machine tool spindle; the lower part of the tool housing (1) is provided with a receiving cavity (106). The torsional vibration amplitude bar (2) is stepped, including a large diameter part (207), a small diameter part (208) and a mounting flange (201). The mounting flange (201) is fixedly connected to the lower end of the blade housing (1) through a connecting unit (5), and the large diameter part (207) is located in the receiving cavity (106), and the blade (9) is fixed at the outer end of the small diameter part (208). The number of ultrasonic transducers (3) is i, i≥2. The i ultrasonic transducers (3) are evenly arrayed around the central axis of the torsional vibration amplitude transformer (2) and are fixedly connected to the large diameter part (207) of the torsional vibration amplitude transformer (2). The vibration of the i ultrasonic transducers (3) is superimposed as an excitation along the circumferential direction of the torsional vibration amplitude transformer (2). The torsional vibration amplitude bar (2) and the cutting tool (9) are based on the resonance of λ / 4 and its multiples, where λ is the wavelength of the sound wave propagating in the torsional vibration amplitude bar (2). The distance between the mounting surface A (2011) of the mounting flange (201) and the outer end of the large diameter part (207) is nλ / 4, where n is a positive even number; the distance between the central axis of the ultrasonic transducer (3) and the outer end of the large diameter part (207) is mλ / 4, where m is a positive odd number; the distance between the end of the cutting tool (9) and the outer end of the large diameter part (207) is jλ / 4, where j is a positive odd number and j > m; Two countersunk surfaces B (205) are provided on the outer end of the torsional vibration amplitude rod (2) near the large diameter part (207). The two countersunk surfaces B (205) are arranged on the outer circumference of the large diameter part (207) and are evenly distributed around the central axis of the large diameter part (207). The countersunk surfaces B (205) are parallel to the central axis of the large diameter part (207). Two pre-tightening bolts (4) are screwed on the blade shell (1). The ends of the two pre-tightening bolts (4) contact the two countersunk surfaces B (205) one by one and apply a pre-tightening force F to the countersunk surfaces B (205). The direction of the torque M formed by the pre-tightening force F on the torsional vibration amplitude rod (2) is consistent with the direction of the superposition of the vibration of the i ultrasonic transducers (3). The wireless power transmission unit (6) is fixedly mounted on the machine tool spindle and electrically connected to the ultrasonic transducer (3).

2. The pre-tightened ultrasonic torsional vibration tool holder according to claim 1, characterized in that: The mounting flange (201) and the blade housing (1) are fixedly connected in the following way: the mounting flange (201) is provided with several through holes (206), and the lower end of the blade housing (1) is provided with several threaded holes (104). The connecting unit (5) is a number of screws or bolts. The connecting unit (5) passes through the through holes (206) and is screwed to the threaded holes (104) so ​​that the mounting flange (201) and the blade housing (1) are fixedly connected.

3. The pre-tightened ultrasonic torsional vibration tool holder according to claim 1, characterized in that: The lower end of the blade shell (1) is machined with a circular groove (105), and the bottom of the circular groove (105) is in contact with the mounting surface B (2012) of the mounting flange (201).

4. The pre-tightened ultrasonic torsional vibration tool holder according to claim 1, characterized in that: The large-diameter portion (207) of the torsional vibration amplitude rod (2) has i countersunk holes (204) uniformly arrayed on its outer circumference. The countersunk holes (204) include a countersunk plane A (2041) and a screw hole (2042). The countersunk plane A (2041) is parallel to the central axis of the torsional vibration amplitude rod (2). The i ultrasonic transducers (3) correspond one-to-one with the i countersunk holes (204). The ultrasonic transducers (3) are fixedly connected to the screw hole (2042) by bolts, and the mounting end face of the ultrasonic transducers (3) is in contact with the countersunk plane A (2041).

5. The pre-tightened ultrasonic torsional vibration tool holder according to claim 1, characterized in that: The pre-tightening bolt (4) is screwed to the blade housing (1) through the countersunk threaded through hole (103) provided on the blade housing (1).

6. The pre-tightened ultrasonic torsional vibration tool holder according to claim 1, characterized in that: The wireless power transmission unit (6) includes a primary power transmitting side (601), a secondary power receiving side (602), an input wire (603), and an output wire (604). The primary power transmitting side (601) is fixedly connected to the machine tool spindle, the secondary power receiving side (602) is fixedly connected to the tool housing (1), the input wire (603) is electrically connected to the ultrasonic power supply (10), and the output wire (604) is electrically connected to the ultrasonic transducer (3).

7. The pre-tightened ultrasonic torsional vibration tool holder according to claim 6, characterized in that: The blade housing (1) is provided with a wire through hole (102) for the output wire (604) to pass through.

8. The pre-tightened ultrasonic torsional vibration tool holder according to claim 1, characterized in that: The lower end of the torsional vibration amplitude rod (2) is provided with a tapered hole (202), and the outer circumference of the lower end of the torsional vibration amplitude rod (2) is provided with an external thread (203). The mounting end of the cutter (9) is inserted into a standard spring collet (7), the standard spring collet (7) is inserted into the tapered hole (202), and the pressure cap (8) presses the outer end of the standard spring collet (7) and screws it into the external thread (203).

9. The pre-tightened ultrasonic torsional vibration tool holder according to claim 1, characterized in that: The machine tool spindle interface (101) is of BT40 specification.

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