Longitudinal-torsion inner-cooling ultrasonic knife handle

Abstract

The invention discloses a longitudinal-torsion inner-cooling ultrasonic knife handle. The longitudinal-torsion inner-cooling ultrasonic knife handle comprises a knife handle shell, a transducer, an amplitude-change pole and a shaft sleeve. The shaft sleeve is connected with the amplitude-change pole through taper fit, ultrasonic vibration can be converted into longitudinal torsional vibration from the axial direction, a front cover plate of the transducer is connected with the amplitude-change pole, a flange plate of the front cover plate of the transducer is connected with a flange plate of the amplitude-change pole and fixed to the cutter handle shell through a cover, and an inner cooling flow channel is formed in the inner wall of the cutter handle shell. Cooling liquid enters the rear end of the cutter handle through the main shaft connector and enters the amplitude-change pole inner cooling hole through the inner cooling flow channel and the through hole in the front cover plate flange plate, and cooling of an ultrasonic machining system and a cutting area is achieved.

Description

Technical Field

[0001] This invention relates to the field of ultrasonic-assisted machining technology, and more particularly to a longitudinal torsion internal cooling ultrasonic tool holder. Background Technology

[0002] With the continuous development of advanced manufacturing technologies, ultrasonic-assisted machining, as a highly efficient precision machining method, has demonstrated significant application advantages in fields such as aerospace and medical devices. Ultrasonic machining, by applying high-frequency vibrations to the tool or workpiece, can effectively reduce cutting forces, improve surface quality and efficiency, and is particularly suitable for grinding, cutting, drilling, and milling processes of hard and brittle materials such as engineering ceramics, optical glass, functional crystals, and composite materials, as well as difficult-to-machine materials such as high-temperature alloys. The performance of the ultrasonic machining system directly affects machining accuracy, tool life, and process stability, and is a key factor influencing the effectiveness of ultrasonic machining.

[0003] In ultrasonic machining systems, the ultrasonic tool holder is a key component for achieving ultrasonic energy transfer and mechanical connection. Its function is to convert electrical signals into mechanical vibrations, amplify them, and thus drive the tool to vibrate for machining. Its performance directly affects the efficiency and quality of ultrasonic machining. Longitudinal-torsional ultrasonic cutting is an advanced machining method combining longitudinal and torsional vibrations. It has been applied to the machining of typical difficult-to-machine materials such as high-temperature alloys, ceramics, and composite materials, offering benefits such as improved chip removal, reduced tool wear, reduced cutting heat, and improved surface quality. Due to the different properties of various difficult-to-machine materials, the required longitudinal-torsional ultrasonic machining parameters and conditions vary. In traditional longitudinal-torsional ultrasonic vibratory tool holders, after assembly and manufacturing, the vibration parameters, such as frequency and mode shape, are relatively fixed due to the fixed structure of the amplitude transformer. When different longitudinal-torsional ratios are required, new amplitude transformer tool holders are needed, increasing trial and maintenance costs. This makes it difficult to adapt to diverse machining needs in complex process environments. Especially in the machining of difficult-to-machine strong and tough metals, such as high-temperature alloys, and difficult-to-machine hard and brittle materials, such as silicon carbide, the cutting forces are high, the cutting temperature is high, and cooling of the cutting zone is difficult. Furthermore, ultrasonic systems experience temperature rises under heavy cutting loads and prolonged operation, altering the resonance performance of the vibration system and consequently affecting its stability. Therefore, it is necessary to design an ultrasonic vibratory tool holder with adjustable vibration states and parameters, capable of achieving longitudinal-torsional combined vibration, and integrating internal cooling. Summary of the Invention

[0004] In response to the aforementioned technical problems, a longitudinal torsion internal cooling ultrasonic scalpel holder is provided.

[0005] The technical means employed in this invention are as follows: A longitudinal torsion internally cooled ultrasonic tool holder includes a tool holder housing, a sealing block, an energy transmission unit, a transducer, a bushing, and an amplitude transformer. An internal cooling channel is formed inside the tool holder housing. The transducer and amplitude transformer are sequentially arranged inside the tool holder housing. A guide groove and an internal cooling hole connected to the guide groove are machined on the connecting surface of the amplitude transformer to the transducer. Coolant enters the internal cooling hole of the amplitude transformer from the spindle connection port through the internal cooling channel. The transducer is connected to the energy transmission unit. A sealing block is provided at the connection between the internal cooling channel and the tool holder housing. The amplitude transformer has an external conical structure. The inner conical surface of the bushing and the outer conical surface of the amplitude transformer are interference-fitted (or transition-fitted), forming a detachable connection with the amplitude transformer.

[0006] Furthermore, the internal cooling channel includes a high-flow-rate channel, a variable-diameter channel, a narrow-diameter channel, a radial channel, and an axial channel. The high-flow-rate channel is an axially opened channel with a diameter larger than a preset value than the diameter of the narrow-diameter channel, located at the spindle connection port. The narrow-diameter channel is also axially opened. The variable-diameter channel is a variable-diameter structure connecting the end of the high-flow-rate channel and the beginning of the narrow-diameter channel. The radial channel is a channel located at the end of the narrow-diameter channel and opened radially along the tool holder housing. There are at least two radial channels. The radial channels are centrally symmetrical about the axis of the amplitude transformer, and their ends are respectively connected to corresponding axial channels. The transducer is placed in the internal space enclosed by the radial and axial channels. The bottom of the transducer has a through hole, which connects the axial channel and the guide groove of the amplitude transformer below it.

[0007] Furthermore, the guide channel is a segmented variable curvature spiral flow channel with a centrally symmetrical structure comprising multiple segments extending from the outside of the flange to the center and distributed centrally symmetrically. Its outer end connects to the through hole at the bottom of the transducer, and its inner end connects to the internal cooling hole of the amplitude transformer.

[0008] Furthermore, the outer side of the bushing is provided with a uniformly distributed spiral groove extending along the axial direction to realize the conversion of axial vibration to torsional vibration. The depth, width and helix angle of the spiral groove can be adjusted according to different longitudinal-torsion ratio requirements. The inner conical surface of the bushing and the outer conical surface of the amplitude transformer adopt a transition or interference fit.

[0009] Furthermore, the transducer includes a preload nut, a rear cover plate, a piezoelectric ceramic stack, and a front cover plate. The piezoelectric ceramic stack is disposed between the front cover plate and the rear cover plate. A stud is provided at the center of the front cover plate. A heat dissipation blind hole is provided inside the stud of the front cover plate. An external thread is provided at the end of the stud of the front cover plate. The preload nut is connected to the stud of the front cover plate by a thread. The tool holder housing has a boss on its outer side, and an energy transmission unit is installed on the boss. The lead wire of the energy transmission unit is connected to the piezoelectric ceramic stack through a hole opened on the tool holder housing.

[0010] Furthermore, the plate with the through hole in the transducer is the first flange, and the plate with the guide groove in the amplitude rod is the second flange. The second flange is welded, glued, or threaded to the first flange. The connected second flange and the first flange are fixed to the tool holder housing by a first gland. Several sealing rings are provided between the tool holder housing and the connected second flange and the first flange.

[0011] Furthermore, the inner conical surface of the bushing has an annular recess at the large-diameter end, the axial length of which is not less than the axial length of the outer conical surface of the amplitude rod. The small end of the amplitude rod is externally threaded to a second pressure cap to achieve axial locking.

[0012] Furthermore, the surface roughness of the connecting surface between the front cover plate and the amplitude rod is better than Ra 0.4 μm, and the surface flatness is better than 0.025 mm.

[0013] Furthermore, annular grooves are provided on the non-connecting surfaces of the first and second flanges to reduce the transmission of amplitude rod vibration to the flanges.

[0014] Furthermore, the other end of the amplitude rod is connected to the tool head via a collet, and the collet is fixed to the tool head with a nut.

[0015] Furthermore, the radius of curvature of the outer section of the flow channel is greater than that of the inner section, and the cross-sectional area of ​​the flow channel increases from the outer side to the center.

[0016] Compared with existing technologies, the present invention has the following advantages: The longitudinal torsion internal cooling ultrasonic tool holder provided by the present invention allows coolant to flow through the tool holder sidewall, through the front cover plate and the internal cooling hole of the amplitude transformer, to the tool head and machining area. Furthermore, it effectively improves the cooling effect of the transducer area and enhances the stability of the system during machining. Annular grooves are provided on both sides of the amplitude transformer flange, which effectively suppresses the transmission of amplitude transformer vibration to the flange. The longitudinal torsion internal cooling ultrasonic tool holder provided by the present invention uses a conical surface to install a bushing on the outside of the amplitude transformer. The evenly distributed spiral grooves on the outside of the bushing convert the axial vibration generated by the transducer into longitudinal torsion vibration, thereby changing the vibration mode of the ultrasonic vibration tool holder. By adjusting the spiral groove parameters (by replacing the bushing with one that has different spiral grooves), the longitudinal torsion ratio, resonant frequency, and other parameters of the vibration system are changed, improving the machining capability of the ultrasonic tool holder and expanding the application range of ultrasonic machining. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0018] Figure 1 A schematic diagram of the overall structure of the longitudinal torsion internal cooling ultrasonic scalpel holder provided for an embodiment of the present invention.

[0019] Figure 2 A schematic diagram of the internal structure of a longitudinally torsion-cooled ultrasonic scalpel holder provided for an embodiment of the present invention.

[0020] Figure 3 A schematic diagram of the structure of the flange connection of the longitudinal torsion internal cooling ultrasonic scalpel holder amplitude transformer provided for an embodiment of the present invention.

[0021] Figure 4 A cross-sectional view of a longitudinally torsion-cooled ultrasonic scalpel holder transducer provided for an embodiment of the present invention.

[0022] Figure 5 A schematic diagram of the front cover plate and amplitude transformer of the longitudinal torsion internal cooling ultrasonic scalpel holder provided for an embodiment of the present invention.

[0023] Figure 6 A schematic diagram of the longitudinal torsion internal cooling ultrasonic shovel bushing structure provided for an embodiment of the present invention.

[0024] In the diagram: 10. Tool holder; 101. Tool holder housing; 102. Sealing block; 103. Energy transmission unit; 104. Transducer; 105. First gland; 106. Bushing; 107. Second gland; 108. Amplifier rod; 109. Collet; 110. Nut; 111. Tool head; 1011. Internal cooling channel; 1061. Spiral groove; 1062. Recess; 1041. Preload nut; 1042. Rear cover plate; 1043. Piezoelectric ceramic stack; 1044. Front cover plate; 1045. Heat dissipation blind hole; 1046. Stud; 1047. Through hole; 1048. Sealing ring; 1049. First flange; 1081. Internal cooling hole; 1082. Guide groove; 1083. Groove; 1084. Second flange. Detailed Implementation

[0025] It should be noted that, unless otherwise specified, the embodiments and features described in the present invention can be combined with each other. The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0026] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. The following description of at least one exemplary embodiment is merely illustrative and is in no way intended to limit the present invention or its application or use. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0027] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the scope of exemplary embodiments according to the invention. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0028] Unless otherwise specifically stated, the relative arrangement, numerical expressions, and values ​​of the components and steps described in these embodiments do not limit the scope of the invention. It should also be understood that, for ease of description, the dimensions of the various parts shown in the drawings are not drawn to actual scale. Techniques, methods, and devices known to those skilled in the art may not be discussed in detail, but where appropriate, such techniques, methods, and devices should be considered part of the specification. In all examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not as limitations. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters in the following figures denote similar items; therefore, once an item is defined in one figure, it need not be further discussed in subsequent figures.

[0029] In the description of this invention, it should be understood that the orientation or positional relationship indicated by directional terms such as "front, back, up, down, left, right", "horizontal, vertical, horizontal" and "top, bottom" is generally based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing this invention and simplifying the description. Unless otherwise stated, these directional terms do not indicate or imply that the device or element referred to must have a specific orientation or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on the scope of protection of this invention. The directional terms "inner" and "outer" refer to the inner and outer contours relative to the outline of each component itself.

[0030] For ease of description, spatial relative terms such as "above," "over," "on the upper surface of," "above," etc., are used herein to describe the spatial positional relationship of a device or feature as shown in the figures to other devices or features. It should be understood that spatial relative terms are intended to encompass different orientations in use or operation besides the orientation of the device as described in the figures. For example, if the device in the figures is inverted, a device described as "above" or "above" other devices or structures would subsequently be positioned as "below" or "under" other devices or structures. Thus, the exemplary term "above" can include both "above" and "below." The device may also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatial relative descriptions used herein will be interpreted accordingly.

[0031] Furthermore, it should be noted that the use of terms such as "first" and "second" to define components is merely for the purpose of distinguishing the corresponding components. Unless otherwise stated, the above terms have no special meaning and therefore should not be construed as limiting the scope of protection of this invention.

[0032] like Figures 1-6 As shown, this embodiment of the invention discloses a longitudinal torsion internal cooling ultrasonic tool holder 10, including a tool holder housing, a sealing block, an energy transmission unit, a transducer, a bushing, and an amplitude transformer. An internal cooling channel 1011 is formed inside the tool holder housing 101. A transducer 104 and an amplitude transformer 108 are sequentially arranged inside the tool holder housing. A guide groove 1082 and an internal cooling hole 1081 connected to the guide groove are machined on the connecting surface of the amplitude transformer 108 to the transducer. Coolant enters the internal cooling hole of the amplitude transformer 108 from the spindle connection port through the internal cooling channel. The transducer is connected to the energy transmission unit. A sealing block 102 is provided at the connection between the internal cooling channel and the tool holder housing. The amplitude transformer 108 has an external conical structure. The inner conical surface of the bushing 106 and the outer conical surface of the amplitude transformer are fitted with an interference fit (transition or interference). Specifically, the radial orifice is sealed by threaded connection, welding, or adhesive bonding through the sealing block 102.

[0033] Furthermore, the internal cooling channel includes a high-flow-rate channel, a variable-diameter channel, a narrow-diameter channel, a radial channel, and an axial channel. The high-flow-rate channel is an axially opened channel with a diameter larger than a preset value than the diameter of the narrow-diameter channel, located at the spindle connection port. The narrow-diameter channel is also axially opened. The variable-diameter channel is a variable-diameter structure connecting the end of the high-flow-rate channel and the beginning of the narrow-diameter channel. Considering the dynamic balance problem after the coolant flows in during tool holder machining, the radial channel is a channel located at the end of the narrow-diameter channel and opened radially along the tool holder housing. The number of radial channels is at least two. The radial channels are centrally symmetrical about the axis of the amplitude transformer, and their ends are respectively connected to corresponding axial channels. The transducer is placed in the internal space enclosed by the radial and axial channels. The bottom of the transducer is provided with a through hole 1047, which connects the axial channel and the guide groove of the amplitude transformer below it.

[0034] Furthermore, the guide channel 1082 is a centrosymmetrical structure comprising multiple segmented variable curvature spiral flow channels extending from the outside of the flange to the center, with its outer end connecting to the through hole 1047 at the bottom of the transducer 104, and its inner end connecting to the internal cooling hole 1081 of the amplitude transformer. The radius of curvature of the outer section of the flow channel is larger than that of the inner section, and the cross-sectional area of ​​the flow channel increases from the outside to the center. By optimizing the path and structure of the guide channel 1082, uniform cooling and compensation for pressure loss caused by centrifugal force are improved.

[0035] Method for setting segmented variable curvature spiral trajectory: Outer region (r ≥ k R) employs a low-curvature logarithmic spiral, with the inner region (r < k R) Employs a high-curvature logarithmic spiral, with the trajectory equation as follows:

[0036] in, r The inner diameter of the inner end of the guide channel, R The outer diameter of the guide channel is the outer end of the channel. k The coefficient for the segmented trajectory switching point. k 1, k 2 represents the coefficients of the logarithmic spiral trajectory. θ This refers to the rotation angle measured starting from the initial edge (outer side) of the flow channel inlet. θ 1. The angle of the segmented trajectory switching point; in this embodiment, k =0.7, k 1 = 0.2, k 2 = 0.8.

[0037] Furthermore, the outer side of the bushing is provided with uniformly distributed spiral grooves 1061 extending axially, the depth, width, and helix angle of which can be adjusted as needed. The uniformly distributed spiral grooves on the outer side of the bushing can convert the axial vibration generated by the transducer into longitudinal torsional vibration, thereby changing the vibration mode of the ultrasonic vibrating tool holder. By disassembling and replacing bushings with different structures and dimensional parameters, the vibration mode of the system can be easily converted (such as adjusting the amplitude, frequency, or mode).

[0038] Furthermore, the transducer includes a preload nut, a rear cover plate, a piezoelectric ceramic stack, and a front cover plate. The piezoelectric ceramic stack 1043 is disposed between the front cover plate 1044 and the rear cover plate 1042. A stud 1046 is provided at the center of the front cover plate. A heat dissipation blind hole 1045 is provided inside the stud of the front cover plate. An external thread is provided at the end of the stud of the front cover plate. The preload nut 1041 is connected to the stud of the front cover plate by a thread. Furthermore, the plate with the through hole in the transducer is a first flange 1049, and the plate with the guide groove in the amplitude rod is a second flange 1084. The second flange is welded, glued, or threaded to the first flange. The connected second flange and the first flange are fixed to the tool holder housing by a first gland 105. Several sealing rings 1048 are provided between the tool holder housing and the connected second flange and the first flange. Specifically, the coolant enters the center hole of the amplitude rod from the spindle connection port through the internal cooling channel, the flow channel hole of the first flange, and the guide groove of the second flange.

[0039] During the welding process, a clamping force along the central axis is applied to both sides of the transducer front cover plate 1044 and the amplitude rod 108 to keep the connecting surfaces in contact. After welding, the outer circle of the integral flange is machined to fit the inner hole of the tool holder housing 101. The first flange 1049 and the second flange 1084 are pressed against the tool holder housing 101 by the first pressure cover 105 after welding, and a seal is achieved by combining multiple sealing rings 1048.

[0040] The heat dissipation blind hole 1045 is designed to allow the coolant to flow to the center of the transducer 104, thereby improving the cooling effect of the transducer 104 area.

[0041] Furthermore, the inner conical surface of the bushing has an annular recess 1062 at the large diameter end, the axial length of which is not less than the axial length of the outer conical surface of the amplitude rod. The small end of the amplitude rod is externally threaded to the second pressure cap 107 to achieve axial locking.

[0042] The tool holder housing has a boss on its outer side, and an energy transmission unit 103 is installed on the boss. The lead wire of the energy transmission unit is connected to the piezoelectric ceramic stack through a hole opened on the tool holder housing.

[0043] Furthermore, the surface roughness of the connecting surfaces between the front cover plate and the amplitude rod does not exceed Ra 0.4 μm, and the surface flatness does not exceed 0.025 mm.

[0044] Furthermore, an annular groove 1083 is provided on the non-connecting surfaces of the first and second flanges to reduce ultrasonic vibrations transmitted to the tool holder.

[0045] Furthermore, the other end of the amplitude rod is connected to the tool head 111 via a collet 109, and the collet and the tool head are clamped and fixed by a nut 110.

[0046] The longitudinal torsion internal cooling ultrasonic tool holder 10 can adopt standard tool holder interfaces such as BT and HSK63 series. This invention takes the BT40 specification as an example for explanation.

[0047] The transducer front cover plate 1044 is made of the same material as the amplitude rod 108, and is equipped with appropriate welding process control to eliminate the risk of joint failure caused by welding thermal stress.

[0048] This invention improves the cooling effect of the transducer 104 area and enhances system stability by creating an internal cooling channel 1011 in the tool holder housing 101, allowing coolant to flow through the front cover plate 1044 and the amplitude transformer 108 into the machining area. The longitudinal-torsional composite ultrasonic vibration is achieved by connecting the bushing 106 to the amplitude transformer 108. The parameters of the spiral groove 1061 are adjustable. By disassembling and replacing bushings with different structures and dimensions, the longitudinal-torsional ratio can be adjusted, improving flexibility in complex machining scenarios and reducing the manufacturing cost of tool holders with different longitudinal-torsional parameters. Unlike existing center-cooled structures, this invention uses a sidewall cooling path for the tool holder, eliminating the need for a center-cooled structure and improving the vibration and cooling performance of the vibration system.

[0049] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A longitudinal torsional internally cooled ultrasonic tool shank characterized by, The tool shank shell is internally provided with an inner cooling flow channel, a transducer and an amplitude lever, the connecting surface of the amplitude lever connected with the transducer is provided with a flow guide groove and an inner cooling hole connected with the flow guide groove, cooling liquid enters the inner cooling hole of the amplitude lever from the main shaft connecting port through the inner cooling flow channel, the transducer is connected with the energy transmission unit, the sealing block is arranged at the connecting position of the inner cooling flow channel and the tool shank shell, and the outer part of the amplitude lever is a conical surface structure.

2. The longitudinal torsional inner-cooled ultrasonic tool holder according to claim 1, wherein, The inner cooling flow channel comprises a large-flow flow channel, a variable-diameter flow channel, a small-diameter flow channel, a radial flow channel and an axial flow channel, the large-flow flow channel is an axially arranged flow channel provided at the main shaft connecting port and having a diameter larger than a preset value than that of the small-diameter flow channel, the small-diameter flow channel is also axially arranged, the variable-diameter flow channel is a variable-diameter structure connecting the end of the large-flow flow channel and the start of the small-diameter flow channel, the radial flow channel is a flow channel arranged at the end of the small-diameter flow channel and arranged along the radial direction of the tool shank shell, the number of the radial flow channels is at least two, the radial flow channels are centrally symmetric about the axis of the amplitude lever, the ends of the radial flow channels are respectively connected with corresponding axial flow channels, the transducer is arranged in the internal space surrounded by the radial flow channels and the axial flow channels, the bottom of the transducer is provided with a through hole, and the axial flow channels and the flow guide groove of the amplitude lever below the transducer are connected through the through hole.

3. The longitudinal torsional internal cooling ultrasonic tool shank of claim 1, wherein, The flow guide groove comprises a plurality of segmented variable-curvature spiral flow channels extending from the outer side of the flange to the center and centrally symmetrically distributed, the outer side of the flow guide groove abuts against the through hole at the bottom of the transducer, and the inner side of the flow guide groove is connected with the inner cooling hole of the amplitude lever.

4. The longitudinal torsional internal cooling ultrasonic tool shank of claim 1, wherein, The outer side of the shaft sleeve is provided with uniformly distributed spiral grooves extending along the axial direction, so as to realize the conversion of axial vibration into torsional vibration, the depth, width and spiral angle of the spiral grooves can be adjusted according to different longitudinal-torsional ratio requirements, and the inner conical surface of the shaft sleeve and the outer conical surface of the amplitude lever are in transition or interference fit.

5. The longitudinal torsional internal cooling ultrasonic tool shank of claim 1 wherein, The transducer comprises a pre-tightening nut, a rear cover plate, a piezoelectric ceramic stack and a front cover plate, the piezoelectric ceramic stack is arranged between the front cover plate and the rear cover plate, the center of the front cover plate is provided with a stud, the stud of the front cover plate is provided with a heat dissipation blind hole, the end of the stud of the front cover plate is provided with an external thread, and the pre-tightening nut is connected with the stud of the front cover plate through the thread; The tool shank shell is provided with a boss on the outer side, the energy transmission unit is mounted on the boss of the tool shank shell, and the lead wire of the energy transmission unit is connected with the piezoelectric ceramic stack through the hole provided on the tool shank shell.

6. The longitudinal torsional internal cooling ultrasonic tool shank of claim 1, wherein, The plate provided with the through hole of the transducer is a first flange plate, the plate provided with the flow guide groove of the amplitude lever is a second flange plate, the second flange plate is welded, cemented or threadedly connected with the first flange plate, the connected second flange plate and the first flange plate are fixed with the tool shank shell through a first gland, and a plurality of sealing rings are arranged between the tool shank shell and the connected second flange plate and first flange plate.

7. The longitudinal torsional internal cooling ultrasonic tool shank of claim 1 wherein, The large-diameter end of the inner conical surface of the shaft sleeve is provided with an annular recess, the axial length of the annular recess is not less than the axial length of the outer conical surface of the amplitude lever, the small end of the amplitude lever is externally threadedly connected with a second gland, and axial locking is realized.

8. The longitudinal torsional internal cooling ultrasonic tool shank of claim 1, wherein, The surface roughness of the connecting surface between the front cover plate and the amplitude lever is better than Ra 0.4 μm, and the surface flatness is better than 0.025 mm.

9. The longitudinal torsional internal cooling ultrasonic tool shank of claim 1, wherein, The non-connection surfaces of the first flange plate and the second flange plate are provided with annular grooves for reducing the vibration transmission of the amplitude rod to the flange plates; the other end of the amplitude rod is connected with the tool head through a collet, and the collet and the tool head are clamped and fixed through a nut.

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