Ultrasonic milling tool shank

Abstract

The application relates to the technical field of ultrasonic machining equipment, in particular to an ultrasonic milling tool handle. When used, the taper shank section is installed on a machine tool spindle and fixedly connected with the machine tool spindle through an original side. The machine tool and an ultrasonic power supply are started, electric energy is transmitted to a sandwich piezoelectric transducer through a wireless coupling transformer, the cover plate and the mounting portion clamp and pre-tighten the piezoelectric ceramic sheet and the electrode sheet, the piezoelectric ceramic sheet is excited to generate ultrasonic vibration, the vibration is transmitted to the amplitude amplification portion through the mounting portion of the integrated amplitude transformer, the mounting portion and the amplitude amplification portion are integrally formed, can withstand high load impact under rough machining and large removal, maintain the continuity and stability of vibration transmission, thereby improving the machining efficiency and prolonging the service life of the blade. The amplified ultrasonic vibration is transmitted to the locking tooth tool bit, the blade is driven to intermittently cut the workpiece, the cutting force and the cutting heat are reduced, the locking tooth tool bit can quickly replace the blade, the downtime is reduced, and the machining efficiency is improved in the scene of rough machining and large removal.

Description

Technical Field

[0001] This application relates to the field of ultrasonic processing equipment technology, and in particular to an ultrasonic milling tool holder. Background Technology

[0002] With the rapid development of high-end equipment, the demand for complex curved surface parts made of difficult-to-machine materials has surged. While these materials can meet the requirements of extreme working conditions such as high strength, high temperature resistance, and corrosion resistance, their excellent properties also bring great difficulties in machining. In rough machining scenarios with large material removal, traditional cutting methods face problems such as large cutting forces, rapid tool wear, and low machining efficiency, which seriously restrict the improvement of production efficiency and product performance.

[0003] Therefore, how to improve processing efficiency in rough processing scenarios with large removal volumes is a technical problem that needs to be solved by those skilled in the art. Summary of the Invention

[0004] This application provides an ultrasonic milling tool holder to improve machining efficiency in roughing scenarios with large material removal.

[0005] To achieve the above objectives, the present invention provides the following technical solution: An ultrasonic milling tool holder, comprising: A tool holder base having a tapered shank section for connection with a machine tool spindle; A sandwich-type piezoelectric transducer is installed on the tool holder base. The sandwich-type piezoelectric transducer includes a cover plate, a piezoelectric ceramic sheet, an electrode sheet, and an integrated amplitude transformer. The integrated amplitude transformer includes a mounting part and an amplitude transformer part. The first side of the mounting part is arranged opposite to the cover plate, and the second side of the mounting part has an integrally formed amplitude transformer part. The mounting part is connected to the cover plate, and the piezoelectric ceramic sheet and the electrode sheet are sandwiched between the cover plate and the mounting part. A wireless coupling transformer includes a primary side and a secondary side. The secondary side is fixedly disposed on the tool holder base. The primary side is used to connect to the machine tool spindle. There is a gap between the primary side and the secondary side. The sandwich piezoelectric transducer is electrically connected to the secondary side. A locking cutter head is connected to the end of the amplitude-changing section away from the mounting section, and is used for detachably mounting the blade.

[0006] Optionally, in the above-mentioned ultrasonic milling tool holder, the middle part of the tapered shank section is provided with a downward-opening cavity, and the cover plate, the piezoelectric ceramic sheet and the electrode sheet are disposed inside the cavity; It also includes a first fixing member. The mounting part includes a mounting plate with a mounting hole in the middle. The first fixing member passes through the mounting hole and is connected to the cover plate and the mounting plate respectively, so as to clamp the piezoelectric ceramic sheet and the electrode sheet between the cover plate and the mounting plate.

[0007] Optionally, in the ultrasonic milling tool holder described above, the edge of the mounting plate is provided with multiple through holes along the circumferential direction, and the cavity wall of the cavity is provided with a fixing part that protrudes outward in the radial direction, and the fixing part is provided with multiple connecting holes accordingly; It also includes multiple second fasteners that pass through the through hole and the connecting hole to fix the integrated amplitude rod to the tool holder base.

[0008] Optionally, in the above-mentioned ultrasonic milling tool holder, the amplitude-changing part includes a conical section and a cylindrical section, the large-diameter end of the conical section is connected to the first end of the cylindrical section, the small-diameter end of the conical section is connected to the locking head, and the second end of the cylindrical section is integrally formed with the second side of the mounting part.

[0009] Optionally, in the ultrasonic milling tool holder described above, a positioning ring is provided on the first side of the mounting part, extending in a direction close to the cover plate. The positioning ring is arranged around the outer periphery of the piezoelectric ceramic sheet. The inner wall of the cavity wall is provided with a flared positioning surface that cooperates with the positioning ring. The mounting part is positioned and engaged by the positioning ring and the flared positioning surface.

[0010] Optionally, in the above-mentioned ultrasonic milling tool holder, the secondary side includes a first coil, a first magnetic core, and a first outer shell. The first outer shell is sleeved and fixed to the outer periphery of the tool holder base. The cavity wall of the cavity also includes a cylindrical portion. The cylindrical portion is integrally formed with the fixing portion, and the outer walls of the cylindrical portion and the fixing portion form a stepped structure. The first outer shell is snapped into the stepped structure. The first magnetic core is disposed inside the first outer shell. The first coil is embedded inside the first magnetic core. The first coil is electrically connected to the electrode plate.

[0011] Optionally, in the above-mentioned ultrasonic milling tool holder, the primary side includes a second coil, a second magnetic core, and a second housing. The second housing is opposite to and coaxially arranged with the first housing, and the second housing is connected to the outer wall of the cylindrical part. The second magnetic core is disposed inside the second housing, and the second coil is embedded inside the second magnetic core. The second coil is used for electrical connection with an external ultrasonic power supply, and there is a gap between the second housing and the first housing.

[0012] Optionally, in the above-mentioned ultrasonic milling tool holder, the small-diameter end of the conical section is provided with a threaded hole along the axial direction, and the locking tool head is threadedly connected to the small-diameter end of the conical section.

[0013] Optionally, in the above-mentioned ultrasonic milling tool holder, an arc-shaped transition portion is provided between the large-diameter end of the conical section and the first end of the cylindrical section.

[0014] Optionally, in the above-mentioned ultrasonic milling tool holder, the original side further includes a locking ring and a support frame. The first end of the support frame is fixedly connected to the second housing, and the second end of the support frame is fixedly connected to the locking ring. The locking ring is used to clamp and fix the housing to the machine tool spindle.

[0015] The ultrasonic milling tool holder provided by this invention, in use, has its tapered shank section installed on the machine tool spindle, fixed to the spindle via its primary side, with a gap between the primary and secondary sides. When the machine tool and ultrasonic power supply are started, electrical energy is transmitted via a wireless coupling transformer to the sandwich-type piezoelectric transducer. The cover plate and mounting part clamp and pre-tighten the piezoelectric ceramic plate and electrode plate, exciting the piezoelectric ceramic plate to generate ultrasonic vibration. This vibration is transmitted to the amplitude transformer part for amplification via the mounting part of the integrated amplitude transformer. Because the mounting part and amplitude transformer part are integrally formed without separate connecting structures, it can withstand high-load impacts under roughing with large removal volumes, maintaining the continuity and stability of vibration transmission, thereby improving machining efficiency and extending the service life of the cutting tools. The amplified ultrasonic vibration is transmitted to the locking head, driving the cutting tool to intermittently cut the workpiece, reducing cutting force and cutting heat. The locking head allows for quick tool replacement, reducing downtime and further improving machining efficiency in roughing with large removal volumes. Attached Figure Description

[0016] The accompanying drawings, incorporated in and forming part of this specification, illustrate embodiments consistent with this application and, together with the description, serve to explain the principles of this application. To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, those skilled in the art can obtain other drawings based on these drawings without creative effort. One or more embodiments are illustrated by way of example through the corresponding images in the accompanying drawings. These exemplary descriptions do not constitute a limitation on the embodiments. Elements with the same reference numerals in the drawings represent similar elements. Unless otherwise stated, the figures in the drawings do not constitute a limitation on scale.

[0017] Figure 1 This is a schematic diagram of the structure of an ultrasonic milling tool holder provided in an embodiment of this application; Figure 2 This is a schematic diagram of the sandwich piezoelectric transducer provided in an embodiment of this application.

[0018] Explanation of reference numerals in the attached figures: Conical shank section 100, sandwich piezoelectric transducer 200, cover plate 201, piezoelectric ceramic plate 202, electrode plate 203, integrated amplitude transformer 300, mounting part 301, amplitude transformer part 302, conical section 3021, cylindrical section 3022, locking cutter head 400, first fixing part 500, second fixing part 501, positioning ring 600, first magnetic core 700, first outer shell 701, second outer shell 702, second magnetic core 703, threaded hole 800, locking ring 900, support frame 901. Detailed Implementation

[0019] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0020] The following disclosure provides numerous different embodiments or examples for implementing various structures of this application. To simplify the disclosure, specific examples of components and arrangements are described below. These are merely examples and are not intended to limit the scope of this application. Furthermore, reference numerals and / or letters may be repeated in different examples. Such repetition is for simplification and clarity and does not in itself indicate a relationship between the various embodiments and / or arrangements discussed. In addition, various specific examples of processes and materials are provided in this application; however, those skilled in the art will recognize the applicability of other processes and / or the use of other materials.

[0021] For ease of description, spatial relative terms may be used in the text to describe the relative position or movement of one element or feature relative to another element or feature, as shown in the figure. These relative terms include, for example, "inside," "outside," "middle," "outer," "below," "below," "above," "front," "back," etc. Such spatial relative terms are intended to include different orientations of the device in use or operation, other than those depicted in the figure. For example, if the device in the figure undergoes a positional flip, orientation change, or change of motion, these directional indications will change accordingly. For instance, an element described as "below other elements or features" or "below other elements or features" will subsequently be oriented "above other elements or features" or "above other elements or features." Therefore, the example term "below" can include both upper and lower orientations. The device may be otherwise oriented (rotated 90 degrees or in other directions), and the spatial relative descriptors used in the text will be interpreted accordingly.

[0022] See Figure 1 and Figure 2 This application provides an ultrasonic milling tool holder, comprising: a tool holder base having a tapered shank section 100 for connection to a machine tool spindle; a sandwich piezoelectric transducer 200 mounted on the tool holder base, the sandwich piezoelectric transducer 200 including a cover plate 201, a piezoelectric ceramic sheet 202, an electrode sheet 203, and an integrated amplitude transformer 300, the integrated amplitude transformer 300 including a mounting portion 301 and an amplitude transformer portion 302, the first side of the mounting portion 301 being arranged opposite to the cover plate 201, and the second side of the mounting portion 301 being... The side is integrally formed with an amplitude-changing part 302, and the mounting part 301 is connected to the cover plate 201. The piezoelectric ceramic sheet 202 and the electrode sheet 203 are clamped between the cover plate 201 and the mounting part 301. The wireless coupling transformer includes a primary side and a secondary side. The secondary side is fixedly set in the tool holder base, and the primary side is used to connect with the machine tool spindle. There is a gap between the primary side and the secondary side. The sandwich piezoelectric transducer 200 is electrically connected to the secondary side. The locking tool head 400 is connected to the end of the amplitude-changing part 302 away from the mounting part 301 and is used to detachably install the cutting tool.

[0023] Specifically, the taper shank section 100 adopts the HSK63A specification, which can be matched with the spindle interface of a high-speed, high-rigidity machining center to achieve quick clamping and high-precision positioning of the tool holder.

[0024] Specifically, the mounting section 301 and the luffing section 302 are machined as a single part, and there is no separate connection structure such as threaded connection.

[0025] Specifically, the wireless coupling transformer includes a primary side and a secondary side. The secondary side is fixedly mounted on the tool holder base, while the primary side is used to connect to the machine tool spindle housing. A gap is maintained between the primary and secondary sides to achieve non-contact power transmission. The electrode plates 203 of the sandwich piezoelectric transducer 200 are electrically connected to the secondary side via wires to receive high-frequency electrical signals. The locking tool head 400 is connected to the end of the amplitude transformer 302 away from the mounting part 301. The locking tool head 400 has a standard insert mounting interface for detachably mounting various indexable inserts, suitable for roughing milling scenarios with large material removal.

[0026] The ultrasonic milling tool holder provided by this invention, in use, has its tapered shank section 100 installed on the machine tool spindle, fixed to the spindle via its primary side, with a gap between the primary and secondary sides. When the machine tool and ultrasonic power supply are started, electrical energy is transmitted via a wireless coupling transformer to the sandwich-type piezoelectric transducer 200. The cover plate 201 and mounting part 301 clamp and pre-tighten the piezoelectric ceramic plate 202 and electrode plate 203, exciting the piezoelectric ceramic plate 202 to generate ultrasonic vibration. This vibration is transmitted via the mounting part 301 of the integrated amplitude transformer 300 to the amplitude transformer 302 for amplitude amplification. Because the mounting part 301 and the amplitude transformer 302 are integrally formed without separate connecting structures, it can withstand high load impacts under rough machining with large removal volumes, maintaining the continuity and stability of vibration transmission, thereby improving machining efficiency and extending the tool's service life. The amplified ultrasonic vibration is transmitted to the thread-locking cutter head 400, which drives the cutting tool to intermittently cut the workpiece, reducing cutting force and cutting heat. The thread-locking cutter head 400 can quickly change the cutting tool, reducing downtime, and further improving processing efficiency in roughing scenarios with large removal volumes.

[0027] To optimize the above technical solution, the conical shank section 100 has a downward-opening cavity in the middle, and the cover plate 201, piezoelectric ceramic sheet 202 and electrode sheet 203 are disposed inside the cavity; it also includes a first fixing member 500, and the mounting part 301 includes a mounting plate, the mounting plate has a mounting hole in the middle, the first fixing member 500 passes through the mounting hole and is connected to the cover plate 201 and the mounting plate respectively, so as to clamp the piezoelectric ceramic sheet 202 and electrode sheet 203 between the cover plate 201 and the mounting plate.

[0028] Specifically, the cavity extends axially along the tapered shank section 100 to accommodate the core components of the sandwich-type piezoelectric transducer 200. The cover plate 201, piezoelectric ceramic plate 202, and electrode plate 203 are all disposed inside the cavity, thus protected by the tool holder base and simplifying the overall shape. The mounting section 301 includes a mounting disc, which is disc-shaped with a mounting hole in the center. The first fixing member 500 may be a stud, which passes sequentially through the cover plate 201, the piezoelectric ceramic plate 202, and the electrode plate 203 before being threaded into the mounting hole on the mounting disc. During assembly, the cover plate 201, piezoelectric ceramic sheet 202, and electrode sheet 203 are stacked together in sequence. The stud passes through the center of the cover plate 201, then through the central through holes of the piezoelectric ceramic sheet 202 and the electrode sheet 203, and finally screws into the mounting hole of the mounting plate. By tightening the stud, the cover plate 201 and the mounting plate are brought closer together, thereby firmly clamping the piezoelectric ceramic sheet 202 and the electrode sheet 203 between them, and applying the required preload.

[0029] The mounting plate not only serves as the end face for clamping the piezoelectric ceramic sheet 202, but also transmits ultrasonic vibration from the piezoelectric ceramic sheet 202 to the amplitude transformer 302. Since the mounting plate and amplitude transformer 302 are integrally formed, vibration can be directly transmitted from the mounting plate to the amplitude transformer 302 without the need for additional connecting parts. The cover plate 201, together with the mounting plate, forms an axial constraint on the piezoelectric ceramic sheet 202. The stud, as the first fixing member 500, has a threaded connection that allows for precise control of the preload, ensuring that the piezoelectric ceramic sheet 202 is always under pressure during operation. Furthermore, the stud's central location ensures that the clamping force is evenly distributed across the end face of the piezoelectric ceramic sheet 202, which is beneficial for generating a stable longitudinal vibration mode.

[0030] During operation, once the stud is tightened, the cover plate 201, piezoelectric ceramic plate 202, electrode plate 203, and mounting plate form an integrated structure. Ultrasonic vibration, generated by the piezoelectric ceramic plate 202, enters the amplitude transformer 302 directly through the mounting plate. Due to the large area of ​​the mounting plate, it effectively collects the vibrational energy generated by the piezoelectric ceramic plate 202 and concentrates it at a smaller cross-section of the amplitude transformer 302, thereby amplifying the amplitude. The centrally located stud clamping method simplifies the assembly process of the sandwich-type piezoelectric transducer 200, ensuring uniform force distribution on the piezoelectric ceramic plate 202 and improving the transducer's electromechanical conversion efficiency. Simultaneously, the integrated design of the mounting plate and the amplitude transformer 302 avoids the threaded connection between the front cover plate 201 and the amplitude transformer rod in traditional transducers, eliminating the risk of loosening under high loads. This allows the entire transducer to withstand large amplitude and high load impacts during rough machining, extending the equipment's service life and ensuring continuous and stable ultrasonic vibration output.

[0031] To optimize the above technical solution, the edge of the mounting plate is provided with multiple through holes along the circumferential direction, and the cavity wall of the cavity is provided with a fixing part that protrudes outward in the radial direction. The fixing part is provided with multiple connecting holes. It also includes multiple second fixing members 501, which pass through the through holes and connecting holes to fix the integrated amplitude transformer 300 to the tool holder base.

[0032] Specifically, the cavity wall of the tool holder base has a radially outward protruding fixing part. This fixing part is actually an annular boss or several independent lug structures. The fixing part has multiple connecting holes, the position and number of which correspond one-to-one with the through holes on the mounting plate. The second fixing member 501 can be a screw. During assembly, the screw is passed through the through hole of the mounting plate and screwed into the connecting hole of the fixing part, thereby fixing the integrated amplitude transformer 300 into the cavity of the tool holder base. The mounting plate is not only a clamping component for the sandwich piezoelectric transducer 200, but also serves as a connecting flange between the integrated amplitude transformer 300 and the tool holder base. By opening through holes on the edge of the mounting plate and fixing it with screws, a detachable connection between the integrated amplitude transformer 300 and the tool holder base is achieved, facilitating subsequent maintenance and replacement of integrated amplitude transformers 300 of different specifications. The radially outward protruding design of the fixing part ensures that the connecting hole has sufficient wall thickness to guarantee the strength of the threaded connection, while avoiding interference with other spaces within the cavity.

[0033] During operation, the second fixing component 501 secures the integrated amplitude transformer 300 to the tool holder base, enabling the tool holder base to rotate synchronously with the spindle. Because the fixing part is integrally formed with the cavity wall, and the connecting hole is axially parallel to the tool holder axis, the screws experience relatively low shear force, primarily providing axial tension, thus ensuring reliable connection. The rigid connection between the sandwich piezoelectric transducer 200 and the tool holder base is achieved by fixing the edge of the mounting plate with screws, ensuring dynamic balance during high-speed rotation. This connection method also facilitates disassembly and assembly, making it convenient for replacing the sandwich piezoelectric transducer 200. Furthermore, the connection surface between the mounting plate and the fixing part also provides some vibration isolation, thereby improving the overall stability and lifespan of the machine.

[0034] To optimize the above technical solution, the amplitude-changing part 302 includes a conical section 3021 and a cylindrical section 3022. The large-diameter end of the conical section 3021 is connected to the first end of the cylindrical section 3022, the small-diameter end of the conical section 3021 is connected to the locking cutter head 400, and the second end of the cylindrical section 3022 is integrally formed with the second side of the mounting part 301.

[0035] Specifically, starting from the mounting section 301, there is first a cylindrical section 3022 with a uniform cross-section, then a conical section 3021 (with a gradually decreasing diameter), and finally the locking head 400 is connected to the small-diameter end of the conical section 3021. This structure forms a stepped composite amplitude transformer with a high amplitude amplification factor. The cylindrical section 3022 serves as a transition area for vibration transmission, and its length and diameter are optimized according to the resonant frequency of the sandwich piezoelectric transducer 200. The conical section 3021 is the main area for amplitude amplification. Because the cross-section gradually decreases along the axial direction, the particle vibration velocity at the point where the cross-section decreases increases in the longitudinal vibration mode, thus achieving amplitude amplification. The amplification factor is related to the taper, length, and diameter ratio of the two ends of the conical section 3021. In this application, the large-diameter end of the conical section 3021 has the same diameter as or slightly smaller than the diameter of the cylindrical section 3022, and the small-diameter end of the conical section 3021 is connected to the locking head 400, thereby maximizing the vibration amplitude of the cutting tool.

[0036] During operation, ultrasonic vibration is transmitted from the mounting section 301 to the cylindrical section 3022, where it propagates as a plane wave before entering the conical section 3021. The amplitude is amplified as the vibration wave propagates from the large cross-section to the small cross-section. Because the amplitude transformer 302 and the mounting section 301 are integrally formed, the entire integrated amplitude transformer 300 has no connecting gaps. Vibration energy is not dissipated due to interface friction during transmission, nor is amplitude attenuation caused by loosening of the threaded connection under high loads. Therefore, in roughing operations with large cutting loads and large material removal, the integrated amplitude transformer 300 can output a sufficiently large amplitude and maintain stability. Furthermore, the small-diameter end of the conical section 3021 is connected to the threaded cutting head 400 via a threaded hole 800, facilitating the replacement of threaded cutting heads 400 of different specifications. By setting a stepped integrated amplitude transformer 300 composed of cylindrical segment 3022 and conical segment 3021, a large amplitude amplification ratio is obtained while ensuring a compact structure. The integrated molding avoids the risk of connection failure of the split amplitude transformer under high load, and can withstand the impact load generated by rough machining, ensuring the long-term stable operation of the ultrasonic vibration system.

[0037] To optimize the above technical solution, the first side of the mounting part 301 is provided with a positioning ring 600 extending in the direction close to the cover plate 201. The positioning ring 600 is arranged around the outer periphery of the piezoelectric ceramic sheet 202. The inner wall of the cavity wall is provided with a flared positioning surface that cooperates with the positioning ring 600. The mounting part 301 is positioned and engaged by the positioning ring 600 and the flared positioning surface.

[0038] Specifically, the positioning ring 600 is a cylindrical protrusion with an inner diameter slightly larger than the outer diameter of the piezoelectric ceramic sheet 202, thus encircling the outer periphery of the piezoelectric ceramic sheet 202. The inner wall of the tool holder base cavity is provided with a flared positioning surface that mates with the positioning ring 600. This flared positioning surface is a conical or cylindrical surface. During assembly, the mounting part 301 is positioned and fitted by the positioning ring 600 into the flared positioning surface, achieving alignment between the integrated amplitude transformer 300 and the tool holder base.

[0039] The positioning ring 600 ensures that the axis of the integrated amplitude transformer 300 coincides with the axis of the tool holder base, thereby guaranteeing the axial propagation of ultrasonic vibration and reducing the lateral vibration component. Simultaneously, the positioning ring 600 also provides radial positioning, ensuring that the multiple through holes on the edge of the mounting plate accurately align with the connecting holes of the fixing part, facilitating screw installation. The flared positioning surface is typically designed as a conical surface. When the positioning ring 600 is inserted into the flared positioning surface, even with minor assembly errors, the conical surface will guide the positioning ring 600 to automatically center itself. During operation, the positioning ring 600 positions the integrated amplitude transformer 300 at the center of the tool holder base, ensuring the dynamic balance performance of the tool holder during high-speed rotation. Furthermore, the positioning ring 600, encircling the outer periphery of the piezoelectric ceramic plate 202, also provides radial limiting for the piezoelectric ceramic plate 202, preventing displacement of the piezoelectric ceramic plate 202 under centrifugal force or lateral impact.

[0040] By interlocking the positioning ring 600 with the flared positioning surface, high-precision alignment of the sandwich piezoelectric transducer 200 and the tool holder base is achieved, ensuring the axial transmission efficiency of ultrasonic vibration and the dynamic balance of high-speed rotation. At the same time, the positioning ring 600 also protects the piezoelectric ceramic sheet 202, improves the impact resistance of the sandwich piezoelectric transducer 200, and enables it to adapt to the harsh working conditions of rough machining, thereby extending the service life of the equipment and improving the stability of the machining process.

[0041] To optimize the above technical solution, the secondary side includes a first coil, a first magnetic core 700, and a first outer shell 701. The first outer shell 701 is sleeved and fixed to the outer periphery of the tool holder base. The cavity wall of the cavity also includes a cylindrical part, which is integrally formed with the fixing part. The outer walls of the cylindrical part and the fixing part have a stepped structure. The first outer shell 701 is snapped into the stepped structure. The first magnetic core 700 is disposed inside the first outer shell 701. The first coil is embedded inside the first magnetic core 700. The first coil is electrically connected to the electrode plate 203.

[0042] Specifically, the first outer shell 701 is fitted and fixed to the outer periphery of the tool holder base, forming a ring-shaped structure. The cavity wall of the tool holder base also includes a cylindrical portion, which is integrally formed with the aforementioned fixing portion, and the outer walls of the cylindrical portion and the fixing portion form a stepped structure. The fixing portion is a radially outward protruding boss with a larger outer diameter, while the outer diameter of the cylindrical portion is smaller, forming a stepped surface between the two. The first outer shell 701 is engaged with this stepped structure, that is, the end face of the first outer shell 701 abuts against the stepped surface to achieve axial positioning. The first coil is electrically connected to the electrode plate 203 through a wire. The wire passes through the wire hole on the tool holder base and then through the wire outlet groove on the first outer shell 701 to connect to the first coil.

[0043] The stepped structure provides a precise axial positioning reference for the first housing 701, ensuring a fixed relative position between the secondary side and the tool holder base, thereby guaranteeing a uniform gap between the primary and secondary sides. Furthermore, the stepped structure allows the first housing 701 to be easily fitted onto the cylindrical part and further secured by snap-fit ​​or screws. During operation, as the tool holder base rotates at high speed with the spindle, the secondary side rotates along with it. The first coil and the first magnetic core 700 are fixed with epoxy resin potting, enabling the secondary side to rotate stably without generating unbalanced centrifugal force. The alternating magnetic field from the primary side passes through the gap, inducing an electromotive force in the first coil, thus providing high-frequency electrical energy to the sandwich-type piezoelectric transducer 200. Because the first housing 701 is snap-fitted to the stepped structure, and the cylindrical part and the fixing part are integrally formed, the entire secondary side is very securely installed, improving the structural stability of the ultrasonic tool holder during rough machining.

[0044] To optimize the above technical solution, the primary side includes a second coil, a second magnetic core 703, and a second outer shell 702. The second outer shell 702 is opposite to and coaxially arranged with the first outer shell 701, and the second outer shell 702 is connected to the outer wall of the cylinder. The second magnetic core 703 is disposed inside the second outer shell 702, and the second coil is embedded inside the second magnetic core 703. The second coil is used for electrical connection with an external ultrasonic power supply, and there is a gap between the second outer shell 702 and the first outer shell 701.

[0045] Specifically, the second outer shell 702 is opposite to and coaxially arranged with the first outer shell 701, meaning both are annular and their axes coincide. The second outer shell 702 is connected to the outer wall of the cylinder. Specifically, the second outer shell 702 can be connected to the cylinder via a bearing, a slip ring, or directly via a support frame 901. Preferably, the second outer shell 702 is connected to the main shaft shell via the support frame 901. Preferably, the inner diameter of the second outer shell 702 is larger than the outer diameter of the cylinder, with a gap between them. The second magnetic core 703 is disposed inside the second outer shell 702, and the second coil is embedded inside the second magnetic core 703 and fixed with epoxy resin potting. The second coil is used for electrical connection with an external ultrasonic power supply. There is a gap between the second outer shell 702 and the first outer shell 701, which exists in both the axial and radial directions to ensure no contact during rotation.

[0046] During operation, a high-frequency current generated by an external ultrasonic power supply is input to the second coil, forming an alternating magnetic field under the guidance of the second magnetic core 703. This magnetic field couples through the gap to the first magnetic core 700 and the first coil, thereby inducing a current on the secondary side. Since there is no mechanical contact between the primary and secondary sides, there is no brush wear issue, making it suitable for high-speed rotation applications. Simultaneously, because the gap between the second housing 702 and the first housing 701 is constant, and both are fixed with potting compound, the magnetic field distribution is uniform, resulting in high power transmission efficiency. The coaxially arranged annular primary and secondary side structure enables non-contact wireless power transmission, improving reliability and safety; the gap design between the primary and secondary sides allows for free disassembly and assembly of the tool holder, facilitating replacement.

[0047] To optimize the above technical solution, the small diameter end of the conical section 3021 is provided with a threaded hole 800 along the axial direction, and the thread-locking cutter head 400 is threadedly connected to the small diameter end of the conical section 3021.

[0048] Specifically, the small-diameter end of the conical section 3021 has a threaded hole 800 along the axial direction, and the locking cutter head 400 has a corresponding external thread or is connected to the conical section 3021 by a threaded fastener. Preferably, the locking cutter head 400 is threadedly connected to the small-diameter end of the conical section 3021, so that the locking cutter head 400 can be quickly replaced according to processing needs, such as replacing it with a different specification of locking cutter head 400 to adapt to different shapes and sizes of cutting tools. The threaded hole 800 is located at the center of the small-diameter end of the conical section 3021, and its axis coincides with the axis of the integrated amplitude transformer 300. The rear end of the locking cutter head 400 has a stud that screws into the threaded hole 800.

[0049] During operation, ultrasonic vibration is transmitted from the small-diameter end of the conical section 3021 to the locking head 400 via a threaded connection, thereby driving the cutting tool. The threaded connection can withstand large axial and radial loads, making it suitable for roughing. When the cutting tool wears out, the operator can loosen the clamping screw on the locking head 400 to quickly replace the cutting tool without removing the entire locking head 400 from the integrated amplitude transformer 300. This modular design allows the same tool holder to adapt to different process requirements from roughing to finishing by replacing the locking head 400 and the cutting tool. The threaded connection reliably fixes the locking head 400 to the amplitude transformer 302, ensuring efficient transmission of ultrasonic vibration; the quick-change feature of the locking head 400 greatly reduces cutting tool change time, improving equipment utilization; at the same time, the threaded connection between the locking head 400 and the amplitude transformer 302 can withstand the high loads of roughing, thereby improving machining accuracy and efficiency.

[0050] To optimize the above technical solution, an arc-shaped transition section is provided between the large-diameter end of the conical segment 3021 and the first end of the cylindrical segment 3022.

[0051] Specifically, the large-diameter end of the conical segment 3021 and the first end of the cylindrical segment 3022 are smoothly connected by an arc surface. The function of the arc-shaped transition is to reduce stress concentration. When the integrated amplitude transformer 300 transmits ultrasonic vibrations, stress concentration occurs at the connection point due to the sudden change in cross-section (from the uniform cross-section of the cylindrical segment 3022 to the variable cross-section of the conical segment 3021). The arc-shaped transition design makes the cross-section change gradual and the stress distribution more uniform, thereby improving the fatigue life of the integrated amplitude transformer 300. In addition, the arc-shaped transition also facilitates the propagation of ultrasonic waves, reduces reflection and scattering, and improves energy transfer efficiency.

[0052] Furthermore, the curved transition section can be made of elliptical or hyperbolic arcs to further improve stress distribution. The surface of the curved transition section can be rolled or polished to eliminate machining marks and further improve fatigue strength.

[0053] To optimize the above technical solution, the original side also includes a locking ring 900 and a support frame 901. The first end of the support frame 901 is fixedly connected to the second housing 702, and the second end of the support frame 901 is fixedly connected to the locking ring 900. The locking ring 900 is used to clamp and fix the housing to the machine tool spindle.

[0054] Specifically, the support frame 901 is an integral structure. The first end of the support frame 901 has a connecting hole or welding surface, and is fixedly connected to the second outer shell 702 by screws or welding. The second end of the support frame 901 has a connecting seat, which is also fixedly connected to the locking ring 900 by screws. The integral structure of the support frame 901 ensures its rigidity and stability, avoiding the cumulative errors and vibration loosening caused by multiple connection interfaces in a split structure.

[0055] Specifically, the locking ring 900 can be C-shaped or U-shaped, with an opening on one side and locking lugs at both ends of the opening. One locking lug has a through hole, and the other has a threaded hole 800. A locking bolt can be used to tighten the opening, thus clamping the locking ring 900 onto the machine tool spindle housing. This arrangement allows the locking ring 900 to accommodate spindle housings of different diameters, and installation simply requires placing the locking ring 900 onto the spindle and tightening a single bolt to secure it.

[0056] During operation, the support frame 901 is first fixed to the second housing 702 by screws or welding. Then, the locking ring 900 is fitted onto the predetermined position on the machine tool spindle housing, so that the inner surface of the locking ring 900 contacts the spindle housing. Next, the locking bolts on the locking ring 900 are tightened, narrowing the opening of the locking ring 900 and generating a radial clamping force, firmly fixing the locking ring 900 to the spindle housing. Because the support frame 901 is fixedly connected to the locking ring 900, and the support frame 901 is also fixedly connected to the second housing 702, the entire primary side (including the second housing 702, the second magnetic core 703, the second coil, and the support frame 901 and locking ring 900) is firmly mounted on the machine tool spindle housing and remains stationary. When the tool holder base drives the secondary side to rotate with the spindle, the gap between the primary and secondary sides remains stable. If the axial position of the original side needs to be adjusted, simply loosen the locking bolt, move the locking ring 90° to the new position, and then retighten it. This arrangement simplifies the structure of the ultrasonic milling tool holder, facilitates its adjustment and installation, and improves its assembly efficiency.

[0057] It should be noted that the ultrasonic milling tool holder provided by this invention can be used in the field of ultrasonic processing equipment technology or other fields. Other fields refer to any field other than the field of ultrasonic processing equipment technology. The above are merely examples and do not limit the application areas of the ultrasonic milling tool holder provided by this invention.

[0058] It should be understood that the terminology used herein is for the purpose of describing particular exemplary embodiments only and is not intended to be limiting. Unless the context clearly indicates otherwise, the singular forms “a,” “an,” and “described” as used herein may also include the plural forms. The terms “comprising,” “including,” “containing,” and “having” are inclusive and therefore indicate the presence of the stated features, steps, operations, elements, and / or components, but do not exclude the presence or addition of one or more other features, steps, operations, elements, components, and / or combinations thereof. The method steps, processes, and operations described herein are not construed as requiring them to be performed in a particular order described or illustrated unless the order of performance is explicitly indicated. It should also be understood that additional or alternative steps may be used.

[0059] Although terms such as first, second, third, etc., may be used in this document to describe multiple elements, components, regions, layers, and / or segments, these elements, components, regions, layers, and / or segments should not be limited by these terms. These terms may be used only to distinguish one element, component, region, layer, or segment from another. Unless the context clearly indicates otherwise, terms such as "first," "second," and other numerical terms used herein do not imply order or sequence. Therefore, the first element, component, region, layer, or segment discussed below may be referred to as the second element, component, region, layer, or segment without departing from the teachings of the exemplary embodiments.

[0060] The above description is merely a specific embodiment of this application, enabling those skilled in the art to understand or implement this application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of this application. Therefore, this application is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features claimed herein.

Claims

1. An ultrasonic milling tool holder, characterized in that, include: A tool holder base having a tapered shank section for connection with a machine tool spindle; A sandwich-type piezoelectric transducer is installed on the tool holder base. The sandwich-type piezoelectric transducer includes a cover plate, a piezoelectric ceramic sheet, an electrode sheet, and an integrated amplitude transformer. The integrated amplitude transformer includes a mounting part and an amplitude transformer part. The first side of the mounting part is arranged opposite to the cover plate, and the second side of the mounting part has an integrally formed amplitude transformer part. The mounting part is connected to the cover plate, and the piezoelectric ceramic sheet and the electrode sheet are sandwiched between the cover plate and the mounting part. A wireless coupling transformer includes a primary side and a secondary side. The secondary side is fixedly disposed on the tool holder base. The primary side is used to connect to the machine tool spindle. There is a gap between the primary side and the secondary side. The sandwich piezoelectric transducer is electrically connected to the secondary side. A locking cutter head is connected to the end of the amplitude-changing section away from the mounting section, and is used for detachably mounting the blade.

2. The ultrasonic milling tool holder according to claim 1, characterized in that, The conical shank section has a downward-opening cavity in the middle, and the cover plate, the piezoelectric ceramic sheet, and the electrode sheet are disposed inside the cavity; It also includes a first fixing member. The mounting part includes a mounting plate with a mounting hole in the middle. The first fixing member passes through the mounting hole and is connected to the cover plate and the mounting plate respectively, so as to clamp the piezoelectric ceramic sheet and the electrode sheet between the cover plate and the mounting plate.

3. The ultrasonic milling tool holder according to claim 2, characterized in that, The edge of the mounting plate has multiple through holes along the circumferential direction, and the cavity wall of the cavity has a fixing part that protrudes outward in the radial direction, and the fixing part has multiple connecting holes accordingly; It also includes multiple second fasteners that pass through the through hole and the connecting hole to fix the integrated amplitude rod to the tool holder base.

4. The ultrasonic milling tool holder according to claim 1, characterized in that, The variable amplitude section includes a conical section and a cylindrical section. The large-diameter end of the conical section is connected to the first end of the cylindrical section, the small-diameter end of the conical section is connected to the locking cutter head, and the second end of the cylindrical section is integrally formed with the second side of the mounting section.

5. The ultrasonic milling tool holder according to claim 3, characterized in that, The first side of the mounting part is provided with a positioning ring extending in the direction close to the cover plate. The positioning ring is arranged around the outer periphery of the piezoelectric ceramic sheet. The inner wall of the cavity wall is provided with a flared positioning surface that cooperates with the positioning ring. The mounting part is positioned and engaged by the positioning ring and the flared positioning surface.

6. The ultrasonic milling tool holder according to claim 3, characterized in that, The secondary side includes a first coil, a first magnetic core, and a first outer shell. The first outer shell is sleeved and fixed to the outer periphery of the tool holder base. The cavity wall of the cavity also includes a cylindrical portion. The cylindrical portion is integrally formed with the fixing portion, and the outer walls of the cylindrical portion and the fixing portion form a stepped structure. The first outer shell is snapped into the stepped structure. The first magnetic core is disposed inside the first outer shell. The first coil is embedded inside the first magnetic core. The first coil is electrically connected to the electrode plate.

7. The ultrasonic milling tool holder according to claim 6, characterized in that, The primary side includes a second coil, a second magnetic core, and a second outer shell. The second outer shell is opposite to and coaxially arranged with the first outer shell, and the second outer shell is connected to the outer wall of the cylindrical part. The second magnetic core is disposed inside the second outer shell, and the second coil is embedded inside the second magnetic core. The second coil is used for electrical connection with an external ultrasonic power supply. There is a gap between the second outer shell and the first outer shell.

8. The ultrasonic milling tool holder according to claim 4, characterized in that, The small-diameter end of the conical section is provided with a threaded hole along the axial direction, and the locking cutter head is threadedly connected to the small-diameter end of the conical section.

9. The ultrasonic milling tool holder according to claim 4, characterized in that, An arc-shaped transition section is provided between the large-diameter end of the conical segment and the first end of the cylindrical segment.

10. The ultrasonic milling tool holder according to claim 7, characterized in that, The original edge also includes a locking ring and a support frame. The first end of the support frame is fixedly connected to the second housing, and the second end of the support frame is fixedly connected to the locking ring. The locking ring is used to clamp and fix the housing to the machine tool spindle.

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