Ultrasonic vibration drilling device for precision metal products

Abstract

This invention discloses a precision metal product ultrasonic vibration drilling device, comprising a drilling machine, an ultrasonic drive assembly, a vibrating head drill rod, and an abrasive fluid pumping assembly. The drilling machine is equipped with a multi-axis tooling base and a lifting guide. The ultrasonic drive assembly and the abrasive fluid pumping assembly are mounted on the lifting guide, and the vibrating head drill rod is connected to the output end of the ultrasonic drive assembly. The ultrasonic drive assembly includes an ultrasonic generator and a transducer, with the transducer connected to the vibrating head drill rod via a column head seat. The vibrating head drill rod includes a sleeve cylinder, an amplitude transformer, and a multi-stage bearing ring assembly fitted externally. The amplitude transformer is equipped with a moving pendulum ball and a pendulum core rod. The bearing ring assembly structure includes a limiting ring, an elastic element, an outer guide plate, and a damping ring, forming a floating support. The sleeve cylinder is connected to the abrasive fluid pumping assembly, and the surface of the amplitude transformer has liquid holes for guiding the flow of abrasive fluid. This device has a compact integrated structure, good vibration isolation and guiding capabilities, and realizes the linkage control of the ultrasonic system and the abrasive fluid supply system.

Description

Technical Field

[0001] This invention relates to the field of ultrasonic processing technology, specifically to an ultrasonic vibration drilling device for precision metal products. Background Technology

[0002] As the precision manufacturing industry increasingly demands higher quality and efficiency in machining holes in high-hardness metal materials (such as cemented carbide, stainless steel, and titanium alloys), ultrasonic vibration machining technology, as a method suitable for micro-hole machining of hard, brittle, and difficult-to-machine metals, is gaining attention. This technology achieves non-contact, high-efficiency machining by utilizing the synergistic effect of high-frequency vibration and abrasive fluid, employing the micro-impact and micro-cutting of abrasive particles on the workpiece surface. It offers advantages such as low machining stress, minimal heat-affected zone, and less workpiece damage.

[0003] Existing ultrasonic vibration drilling equipment typically includes: a machine tool body, which provides workpiece clamping and position adjustment functions, and comes in both vertical and horizontal forms; an ultrasonic vibration system, mainly composed of an ultrasonic generator, transducer, and amplitude transformer, used to realize the conversion of electromechanical energy and amplitude amplification; and a tool system and a fluid supply system, in which a grinding head or drill bit is fixed at the tool end, and the abrasive fluid is delivered to the processing area through an external pump to participate in abrasion.

[0004] However, existing technologies still face the following prominent problems and shortcomings:

[0005] Low system integration and dispersed structure: Most devices place the ultrasonic vibration system and liquid supply system in different parts of the machine tool, which is complicated to install, cumbersome to wire, and has low installation and adjustment efficiency. It is not conducive to rapid deployment and on-site maintenance, and is prone to unstable liquid supply and pipeline interference during lifting and moving.

[0006] The vibration path is too simple and the support structure is not rigid enough: the existing technology generally adopts a single-stage variable amplitude rod rigid connection structure, which lacks intermediate buffer and support mechanism. This leads to problems such as large energy loss, insufficient resonance and easy transmission of non-axial vibration to the equipment body during the vibration process, which affects the processing efficiency and service life of the equipment.

[0007] Poor control system compatibility: The ultrasonic generator and liquid supply system of some equipment are independent control units, which cannot achieve real-time linkage control. There is a problem of inconsistent timing between abrasive liquid injection and vibration output, which often leads to processing interruption, hole wall damage or abrasive deposit blockage, affecting the final processing quality and stability.

[0008] In summary, existing ultrasonic vibration drilling devices still have significant shortcomings in terms of integrated structure, vibration support, and control linkage. There is an urgent need for a compact, stable, and well-controlled ultrasonic vibration drilling system to further improve its adaptability and reliability for micro-hole machining of precision metal products. Summary of the Invention

[0009] The present invention aims to solve one of the technical problems existing in the prior art or related technologies.

[0010] Therefore, the technical solution adopted by the present invention is as follows: a precision metal product ultrasonic vibration drilling device, comprising: a drilling machine, an ultrasonic drive assembly, a vibrating head drill rod, and an abrasive fluid pumping assembly. The surface of the drilling machine is provided with a multi-axis tooling base for positioning the metal product. A lifting guide is slidably installed on the surface of the drilling machine. The ultrasonic drive assembly and the abrasive fluid pumping assembly are fixed to the surface of the lifting guide, and the vibrating head drill rod is fixed to the output end of the ultrasonic drive assembly. The ultrasonic drive assembly includes an ultrasonic generator and a transducer, and the output end of the transducer is provided with a column head seat for connecting with the vibrating head drill rod.

[0011] The vibratory drill rod includes a sleeve cylinder, an amplitude transformer, and a bearing ring assembly fixed inside the sleeve cylinder. The top of the sleeve cylinder has a fixed seat, and the inner side of the fixed seat has a ring seat. A movable pendulum ball is movably mounted on the top surface of the amplitude transformer, and a pendulum core rod located inside the amplitude transformer is connected to the bottom surface of the movable pendulum ball. One end of the bearing ring assembly is connected to the output end of the transducer, and the bottom end of the bearing ring assembly abuts against the top surface of the movable pendulum ball. The bearing ring assembly is sleeved on the surface of the amplitude transformer for floating support. The output end of the abrasive fluid pumping assembly communicates with the inside of the sleeve cylinder for conveying abrasive fluid into the sleeve cylinder. Several liquid holes are formed on the surface of the amplitude transformer. This achieves integrated and coordinated operation of the ultrasonic vibration system and the abrasive fluid delivery system, improving the high-efficiency and precision drilling capability for metal products.

[0012] In a preferred embodiment, the present invention can be further configured as follows: the ultrasonic generator is electrically connected to the transducer to provide an excitation electrical signal to cause the transducer to generate ultrasonic vibration, and the transducer transmits the vibration energy to the vibrating drill rod through the column head seat; the input end of the ultrasonic generator is electrically connected to a control system, which is used to control the frequency, power and working duration of the ultrasonic signal, and synchronously control the opening and flow output of the abrasive fluid pumping component to achieve coordinated operation of ultrasonic vibration and abrasive fluid supply.

[0013] Among them, centralized control enables the synchronous linkage between ultrasonic vibration and abrasive fluid supply during the processing, thereby improving processing consistency and automation.

[0014] In a preferred embodiment, the present invention can be further configured such that: the column head seat and the fixed seat adopt a detachable installation structure with threaded connection or limit buckle engagement, which facilitates the disassembly and maintenance of the vibratory drill rod; the output end of the transducer is fixedly connected to the bearing ring assembly by plug-in or positioning pin, to ensure the stability of vibration transmission and axial concentricity.

[0015] Its technical advantages include improved component maintainability and installation alignment accuracy, facilitating quick replacement of machining heads and ensuring machining precision.

[0016] In a preferred embodiment, the present invention may be further configured such that: a ring seat is provided on the inner side of the fixed seat, and the ring seat is arranged around the outer periphery of the bearing ring assembly to isolate the vibration transmission between the bearing ring assembly and the fixed seat.

[0017] Its technical effect lies in effectively reducing the transmission of vibration from the vibration system to the machine tool body, reducing interference, and improving the efficiency of vibration energy utilization.

[0018] In a preferred embodiment, the present invention can be further configured such that: the number of bearing ring groups is several and they are stacked, each bearing ring group includes a ring seat, a limiting ring, an outer guide plate and a connecting strip fixed to the outer periphery of the limiting ring, the limiting ring is fixedly sleeved on the surface of the amplitude transformer, the outer guide plate is arranged on the outer periphery of the limiting ring and one end slides against the inner side of the ring seat, and the two ends of the connecting strip are fixedly connected to the outer periphery of the limiting ring and the inner side of the ring seat, respectively.

[0019] Its technical effect lies in realizing multi-level floating guide support on the outside of the amplitude rod, which effectively suppresses polarization and lateral displacement.

[0020] In a preferred embodiment, the present invention can be further configured such that: the connecting strip is a spring-like structure for floating support of the limiting ring; springs are provided on both sides of the outer guide plate; and the outer guide plate and the limiting ring are sleeved on the inner side of the ring seat.

[0021] Specifically, the connecting strip enables the limiting ring to float and deflect within the ring seat. Guided by the outer guide plate, the limiting ring can float and deflect within the ring seat. Furthermore, the deflection vibration of the limiting ring and the outer guide plate is further mitigated by the spring plates on both sides of the outer guide plate, preventing it from colliding with the inner wall of the ring seat. This technology improves the vibration resistance and stability of the bearing ring assembly under high-frequency deflection conditions, effectively protecting the structural integrity.

[0022] In a preferred embodiment, the present invention can be further configured such that a plurality of the aforementioned ring assemblies are stacked and fixedly connected to each other, with the connecting strips on the inner sides of each ring seat facing different directions.

[0023] Its technical effect lies in forming a multi-directional elastic support structure, which enhances the adaptability and buffering capacity to axial and radial combined vibrations.

[0024] In a preferred embodiment, the present invention can be further configured such that: a ball seat is fixedly installed on the surface of the luffing rod, the inner side of the sleeve cylinder is throat-shaped, and the outer periphery of the ball seat slides in contact with the throat area inside the sleeve cylinder for dynamic support of the luffing rod.

[0025] Its technical advantage lies in providing a stable and flexible guiding structure, ensuring that the amplitude rod has good freedom of movement and support stiffness during vibration processing.

[0026] In a preferred embodiment, the present invention can be further configured such that the diameter of the pendulum rod decreases linearly downward along the axial direction, and the pendulum rod is an alloy steel component.

[0027] Its technical effect is to enhance the strength and fatigue resistance of the pendulum rod, while optimizing the vibration transmission path and improving processing energy efficiency.

[0028] The beneficial effects achieved by this invention are as follows:

[0029] 1. In this invention, by integrating the ultrasonic drive assembly, the vibratory drill rod, and the abrasive fluid pumping assembly onto the lifting guide frame, and adopting a composite floating structure of the amplitude rod and the multi-layer bearing ring assembly, the synchronous cooperation of ultrasonic vibration drilling and abrasive erosion is achieved, which significantly improves the processing efficiency and hole position accuracy of micro-hole processing of hard metal products, and is suitable for deep hole, small hole and high-precision processing scenarios.

[0030] 2. In this invention, by setting up a stacked bearing ring assembly structure consisting of an elastic element, a limiting ring, an outer guide plate, and a damping ring, and in conjunction with the elastic connection of the moving pendulum ball and the pendulum core rod, non-axial vibration energy can be effectively absorbed and buffered during vibration processing, reducing vibration transmission interference and improving system stability and service life.

[0031] 3. In this invention, the control system enables real-time linkage control of the output parameters of the ultrasonic generator and the flow rate of the abrasive slurry pump, ensuring that the vibration output and abrasive slurry injection remain consistent throughout the drilling process. This effectively avoids problems such as intermittent drilling, blockage, or delayed liquid supply, thereby improving the automation level of the system and the continuity and controllability of the processing. Attached Figure Description

[0032] Figure 1 This is a schematic diagram of the overall structure of one embodiment of the present invention;

[0033] Figure 2 This is a schematic diagram of the surface structure of a lifting guide frame according to an embodiment of the present invention;

[0034] Figure 3 This is a schematic diagram of a vibratory drill rod structure according to an embodiment of the present invention;

[0035] Figure 4 This is a schematic diagram of the cross-sectional structure of a vibratory drill rod according to an embodiment of the present invention;

[0036] Figure 5 This is a schematic diagram of the cross-sectional structure of the amplitude transformer according to an embodiment of the present invention;

[0037] Figure 6 This is a schematic diagram of the amplitude transformer and bearing ring assembly structure according to an embodiment of the present invention;

[0038] Figure 7 This is an exploded structural diagram of the bearing ring assembly according to an embodiment of the present invention;

[0039] Figure 8 This is a schematic diagram of a bearing ring assembly structure according to an embodiment of the present invention.

[0040] Figure label:

[0041] 100. Drilling machine; 110. Multi-axis tooling base; 120. Lifting guide frame;

[0042] 200. Ultrasonic drive assembly; 210. Ultrasonic generator; 220. Transducer; 230. Headstock;

[0043] 300. Vibratory drill rod; 310. Sleeve cylinder; 320. Amplitude rod; 330. Bearing ring assembly; 311. Fixed seat; 321. Ball seat; 322. Moving pendulum ball; 323. Pendulum core rod; 324. Liquid hole; 331. Ring seat; 332. Limiting ring; 333. Outer guide plate; 334. Connecting bar;

[0044] 400. Abrasive fluid pumping assembly. Detailed Implementation

[0045] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to specific embodiments and accompanying drawings. It should be noted that, unless otherwise specified, the embodiments and features described herein can be combined with each other.

[0046] It should be understood that these descriptions are merely exemplary and are not intended to limit the scope of the invention.

[0047] The following describes, with reference to the accompanying drawings, some embodiments of the present invention, an ultrasonic vibration drilling device for precision metal products.

[0048] Combination Figures 1-8 As shown, the present invention provides an ultrasonic vibration drilling device for precision metal products, including a drilling machine 100, an ultrasonic drive assembly 200, a vibrating head drill rod 300, and an abrasive fluid pumping assembly 400.

[0049] The drilling machine 100 has a vertical structure and a multi-axis tooling base 110 on its front side for precise positioning of metal workpieces. It can also be adapted to multi-station fixtures to meet the drilling needs of multiple holes.

[0050] A lifting guide 120 is installed on the vertical column of the drilling machine 100. The lifting guide 120 can slide and adjust its height in the vertical direction to accommodate metal products of different thicknesses or heights. An ultrasonic drive assembly 200 and an abrasive fluid pumping assembly 400 are fixedly installed on the front end face of the lifting guide 120.

[0051] The ultrasonic drive assembly 200 includes an ultrasonic generator 210 and a transducer 220. The ultrasonic generator 210 is connected to the transducer 220 via a cable, and its output frequency range is adjustable, for example, 20–40 kHz, to drive the transducer 220 to generate high-frequency longitudinal mechanical vibration. The output end of the transducer 220 is connected to a headstock 230, which is detachably connected to the fixing seat 311 of the vibratory drill rod 300 via a threaded or limiting snap-fit ​​structure, facilitating quick replacement of machining tools or maintenance of the system.

[0052] The output end of the transducer 220 is further connected to the bearing ring assembly 330 via a positioning pin to ensure the directional stability of vibration and structural coaxiality, and to prevent vibration loss or energy leakage.

[0053] The vibratory drill rod 300 is the core processing component of this device, including the sleeve cylinder 310, the amplitude rod 320, and the multi-stage bearing ring assembly 330 sleeved on the outer periphery of the amplitude rod 320.

[0054] The sleeve cylinder 310 is fixed to the lower part of the column head seat 230, and its upper end is connected to the fixed seat 311. The inner side of the fixed seat 311 is provided with a ring seat 331, which is used to provide vibration isolation support for the lower vibration structure and reduce the transmission of vibration to the equipment body.

[0055] One end of the amplitude rod 320 passes through the fixed base 311, and a movable pendulum ball 322 is installed on its upper part. The movable pendulum ball 322 and the amplitude rod 320 are connected by a pendulum core rod 323. The diameter of the pendulum core rod 323 gradually decreases in the lower part of the axis, and it has a conical structure to match the ultrasonic vibration transmission characteristics and enhance its resonance capability. The pendulum core rod 323 is made of high-strength alloy steel to improve durability and rigidity.

[0056] The top of the pendulum ball 322 contacts the bottom of the bearing ring assembly 330 to transmit vibration. The bearing ring assembly 330 adopts a multi-layer structure. Each layer includes a ring seat 331, a limiting ring 332, an outer guide plate 333, and a connecting bar 334. The limiting ring 332 is sleeved on the outer circumference of the amplitude rod 320 to maintain axial guidance. The outer guide plate 333 and the ring seat 331 are in sliding contact. The connecting bar 334 is set on both sides of the outer guide plate 333 and connects to the ring seat 331 to provide floating vibration damping support.

[0057] Multiple bearing ring assemblies 330 are stacked along the axial direction and fixedly connected to each other. The connecting strips 334 in each bearing ring assembly 330 are arranged in different directions to form an interlaced structure, which effectively absorbs the multidimensional vibration components generated by the amplitude transformer 320 at high frequency.

[0058] To ensure stable support for the amplitude rod 320 during operation, a ball seat 321 is provided on its outer periphery. The ball seat 321 slides in a throat-like manner with the inner side of the sleeve cylinder 310, providing axial movement support and a certain radial buffering capacity.

[0059] In addition, multiple liquid holes 324 are provided on the outer wall of the amplitude rod 320 to guide the abrasive fluid to be discharged evenly, ensuring that the drilling area continuously receives a high concentration of abrasive fluid.

[0060] The abrasive slurry pumping assembly 400 includes a storage tank, a metering pump, and a delivery pipeline. Its output end is connected to the inside of the sleeve cylinder 310 via a hose or metal conduit. It is used to deliver the liquid containing boron carbide abrasive to the surface of the processing area, where it is confined and concentrated by the sleeve cylinder 310, thereby improving material removal efficiency. The control system can precisely control the pumping timing and liquid flow rate according to the processing program, achieving coordinated matching between the vibration system and the abrasive slurry supply.

[0061] When the entire device is in operation, the control system starts the ultrasonic generator 210 to output a high-frequency signal, which drives the transducer 220 to generate longitudinal vibration. The vibration is transmitted through the column head seat 230, the bearing ring group 330 and the moving pendulum ball 322 to the end of the amplitude rod 320. Combined with the abrasive liquid sprayed from the liquid hole 324, it continuously impacts and polishes the surface of the workpiece, ultimately achieving high-precision drilling.

[0062] This device is suitable for micro-hole or deep-hole drilling of difficult-to-machine metal materials such as cemented carbide and stainless steel. The hole diameter range can reach 0.1 to 90 mm, the hole position accuracy can be controlled within 0.02 to 0.05 mm, and the surface roughness is better than 0.63 micrometers, greatly improving processing efficiency and accuracy.

[0063] Working principle and usage process of this invention:

[0064] The ultrasonic vibration drilling device of the present invention is based on the combined action principle of "ultrasonic vibration + abrasive fluid", and combines multiple sets of vibration structures and floating support mechanisms to achieve high-precision and high-quality micro-hole processing of hard metal workpieces such as cemented carbide. Its core working principle is as follows:

[0065] Electrical energy conversion and ultrasonic excitation: The ultrasonic generator 210 converts the power frequency AC power into a high frequency ultrasonic electrical signal, which is then transmitted to the transducer 220 via an electrical connection.

[0066] Mechanical vibration generation and transmission: The transducer 220 converts the received ultrasonic frequency electrical signal into longitudinal mechanical vibration, and transmits it to the bearing ring assembly 330 and the amplitude transformer 320 through the column head seat 230;

[0067] Amplification and energy focusing: The bearing ring assembly 330 and the amplitude transformer 320 work together to conduct and amplify the vibration energy while maintaining floating and vibration isolation support, so that the amplitude transformer 320 and the end of the pendulum rod 323 generate enhanced longitudinal ultrasonic vibration.

[0068] Abrasive impact creates micropores: The vibrating end drives the tool to impact the workpiece surface, while the abrasive liquid pumping component 400 injects boron carbide-containing liquid into the sleeve cylinder 310 and flows into the processing area. By utilizing the continuous impact of suspended particles on the processing surface under high-frequency vibration, a highly efficient and minimally damaged material removal process is achieved.

[0069] In the description of this specification, the terms "one embodiment," "some embodiments," "specific embodiment," etc., refer to a specific feature, structure, material, or characteristic described in connection with that embodiment or example, which is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0070] Although embodiments of the invention have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the claims and their equivalents.

Claims

1. A precision metal product ultrasonic vibration drilling device, characterized in that, include: The drilling machine (100), ultrasonic drive assembly (200), vibrating drill rod (300), and abrasive fluid pumping assembly (400) are provided. The surface of the drilling machine (100) is provided with a multi-axis tooling base (110) for positioning metal products. A lifting guide (120) is slidably installed on the surface of the drilling machine (100). The ultrasonic drive assembly (200) and the abrasive fluid pumping assembly (400) are fixed on the surface of the lifting guide (120), and the vibrating drill rod (300) is fixed to the output end of the ultrasonic drive assembly (200). The ultrasonic drive assembly (200) includes an ultrasonic generator (210) and a transducer (220), and the output end of the transducer (220) is provided with a column head seat (230) for connecting to the vibrating drill rod (300). The vibratory drill rod (300) includes a sleeve cylinder (310), an amplitude transformer (320), and a bearing ring assembly (330) fixed inside the sleeve cylinder (310). The top of the sleeve cylinder (310) is provided with a fixed seat (311), and the inner side of the fixed seat (311) is provided with a ring seat (331). A movable pendulum ball (322) is movably mounted on the top surface of the amplitude transformer (320), and the bottom surface of the movable pendulum ball (322) is connected to a pendulum core rod (323) located inside the amplitude transformer (320). The bearing ring assembly... One end of (330) is connected to the output end of transducer (220), and the bottom end of the bearing ring assembly (330) abuts against the top surface of the moving pendulum ball (322). The bearing ring assembly (330) is sleeved on the surface of the amplitude rod (320) for floating support of the amplitude rod (320). The output end of the abrasive liquid pumping assembly (400) is connected to the inside of the sleeve cylinder (310) for conveying abrasive liquid into the inside of the sleeve cylinder (310). The surface of the amplitude rod (320) is provided with several liquid holes (324).

2. The ultrasonic vibration drilling device for precision metal products according to claim 1, characterized in that, The ultrasonic generator (210) is connected to the transducer (220) via an electrical connection to provide an excitation electrical signal to cause the transducer (220) to generate ultrasonic vibration. The transducer (220) transmits the vibration energy to the vibrating drill rod (300) through the column head seat (230). The input end of the ultrasonic generator (210) is electrically connected to a control system. The control system is used to control the frequency, power and working time of the ultrasonic signal, and to synchronously control the opening and flow output of the abrasive fluid pumping assembly (400) to achieve coordinated operation of ultrasonic vibration and abrasive fluid supply.

3. The ultrasonic vibration drilling device for precision metal products according to claim 1, characterized in that, The column head seat (230) and the fixed seat (311) are connected by a threaded connection or a limit buckle for a detachable installation structure, which facilitates the disassembly and maintenance of the vibratory drill rod (300); the output end of the transducer (220) is fixedly connected to the bearing ring assembly (330) by plugging or positioning pin to ensure the stability of vibration transmission and axial concentricity.

4. The ultrasonic vibration drilling device for precision metal products according to claim 1, characterized in that, The fixed seat (311) is provided with a ring seat (331) on the inner side, and the ring seat (331) is arranged around the outer periphery of the bearing ring assembly (330) to isolate the vibration transmission between the bearing ring assembly (330) and the fixed seat (311).

5. The ultrasonic vibration drilling device for precision metal products according to claim 1, characterized in that, The number of bearing ring assemblies (330) is several and they are stacked. Each bearing ring assembly (330) includes a ring seat (331), a limiting ring (332), an outer guide plate (333) fixed to the outer periphery of the limiting ring (332), and a connecting bar (334). The limiting ring (332) is fixedly sleeved on the surface of the amplitude rod (320). The outer guide plate (333) is arranged on the outer periphery of the limiting ring (332) and one end slides against the inner side of the ring seat (331). The two ends of the connecting bar (334) are fixedly connected to the outer periphery of the limiting ring (332) and the inner side of the ring seat (331), respectively.

6. The ultrasonic vibration drilling device for precision metal products according to claim 5, characterized in that, The connecting bar (334) is a spring-shaped structure used for floating support of the limiting ring (332). Both sides of the outer guide plate (333) are provided with springs. The outer guide plate (333) and the limiting ring (332) are sleeved on the inner side of the ring seat (331).

7. The ultrasonic vibration drilling device for precision metal products according to claim 1, characterized in that, Several ring assemblies (330) are stacked and fixedly connected to each other, and the connecting strips (334) on the inner side of each ring seat (331) face different directions.

8. The ultrasonic vibration drilling device for precision metal products according to claim 1, characterized in that, A ball seat (321) is fixedly installed on the surface of the amplitude rod (320). The inner side of the sleeve cylinder (310) is throat-shaped, and the outer periphery of the ball seat (321) slides in contact with the inner throat area of ​​the sleeve cylinder (310) for dynamic support of the amplitude rod (320).

9. The ultrasonic vibration drilling device for precision metal products according to claim 1, characterized in that, The diameter of the pendulum rod (323) decreases linearly downward along the axial direction, and the pendulum rod (323) is an alloy steel component.

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