Fine thread ultrasonically strengthened tool head

Abstract

The utility model relates to the technical field of ultrasonic machining, and disclose a fine thread ultrasonic strengthening tool head, aims at solving the problem that the existing tool head amplitude bar and tool head connection is easy to loosen, vibration transmission efficiency is low, and the connecting place is easy to wear. The tool head includes transducer, amplitude bar, compensation sleeve and tool head body, the lower end of transducer is connected with the upper end of amplitude bar through thread, the lower end of amplitude bar is connected with the upper end of tool head body through thread, the lower part of amplitude bar and the upper part of tool head body are connected with the second connecting groove which is mutually connected and central symmetry, amplitude bar is equipped with the first connecting groove, and tool head body is equipped with the third connecting groove, the inside of compensation sleeve is fixedly installed with the compensation block which is central symmetry, is equipped with the limit card in the middle, and is equipped with the sleeve ring in the upper and lower ends. The scheme optimizes the connection stability through "thread + compensation sleeve double positioning", the compensation block fills the gap, reduces the vibration loss and compensates the wear, and the vibration transmission efficiency and the service life of tool head body are improved.

Description

Technical Field

[0001] This utility model relates to the field of ultrasonic processing technology, specifically to a fine thread ultrasonic strengthening tool head. Background Technology

[0002] In the field of mechanical manufacturing, fine-thread structures are widely used in the connection of precision components. However, they require high dimensional accuracy and have limited load-bearing capacity. Therefore, ultrasonic vibration strengthening technology is needed to treat their surfaces to improve fatigue strength, wear resistance, and stress corrosion resistance, ensuring the reliability and service life of the entire machine. However, existing fine-thread ultrasonic strengthening toolheads have insurmountable technical defects in practical applications, resulting in strengthening effects and device lifespan that cannot meet industrial requirements. Specific technical problems are as follows:

[0003] First, in existing tool heads, the amplitude transformer and the tool head are mostly connected by a single thread. Under high-frequency vibration conditions, the threaded connection is prone to loosening, leading to an increase in the coaxiality deviation between the amplitude transformer and the tool head, a decrease in vibration transmission accuracy, and an inability to accurately act on the fine thread surface. This, in turn, affects the uniformity of the surface residual compressive stress and weakens the strengthening effect. Second, the connection between the amplitude transformer and the tool head lacks a dedicated compensation structure. The continuous impact generated by high-frequency vibration is prone to causing metal wear at the connection point, shortening the overall service life of the tool head. Third, vibration energy is easily lost at the connection due to assembly gaps, and there is no effective positioning and constraint structure, resulting in low vibration transmission efficiency and difficulty in stably introducing deep residual compressive stress. The performance improvement after fine thread strengthening is limited.

[0004] Therefore, a fine-threaded ultrasonic-strengthened tool head body is proposed. The transducer and amplitude transformer, as well as the amplitude transformer and tool head body, are fundamentally fixed via threaded connections. A centrally symmetrical second connecting groove is formed at the lower part of the amplitude transformer and the upper part of the tool head body, while a first connecting groove is provided on the amplitude transformer and a third connecting groove is provided on the tool head body. A compensation sleeve adapted to the connection is configured, with a centrally symmetrical compensation block fixed inside, a limiting clip in the middle, and collars at the upper and lower ends. The compensation block is embedded in the second connecting groove, and the collars are respectively engaged in the first and third connecting grooves. The limiting clip achieves axial positioning of the compensation sleeve, thereby optimizing connection stability, compensating for wear, and improving vibration transmission efficiency. Utility Model Content

[0005] To address the shortcomings of existing technologies, this utility model provides a fine-thread ultrasonically reinforced tool head.

[0006] To achieve the above-mentioned objective, this utility model provides the following technical solution: a fine-threaded ultrasonic strengthening tool head, comprising a transducer, an amplitude transformer, a compensation sleeve, and a tool head body. The lower end of the transducer is threadedly connected to the upper end of the amplitude transformer, and the lower end of the amplitude transformer is threadedly connected to the upper end of the tool head body. The compensation sleeve is fitted onto the connection between the amplitude transformer and the tool head body. A collar is provided at each of the upper and lower ends of the compensation sleeve, and a compensation block arranged in a centrally symmetrical manner is fixedly installed on the inner side of the compensation sleeve.

[0007] Furthermore, the lower part of the amplitude rod and the upper part of the tool head body are provided with a second connecting groove that communicates with each other, and the second connecting groove is centrally symmetrically distributed.

[0008] Furthermore, a first connecting groove is provided on the upper end of the second connecting groove on the amplitude rod, and a third connecting groove is provided on the tool head body in the middle of the second connecting groove.

[0009] Furthermore, the shape and size of the compensation block are adapted to the second connecting groove, and the compensation block is embedded in the second connecting groove.

[0010] Furthermore, the shape of the compensation sleeve is adapted to the outer contour of the connection between the amplitude rod and the tool head body.

[0011] Furthermore, a limiter is integrally formed at the middle position of the inner side of the compensation sleeve.

[0012] Furthermore, the upper collar of the compensation sleeve is fitted into the first connecting groove, and the lower collar of the compensation sleeve is fitted into the third connecting groove.

[0013] Compared with the prior art, this utility model provides a fine-thread ultrasonically reinforced tool head, which has the following beneficial effects:

[0014] 1. In this solution, the "threaded connection + compensation sleeve dual positioning" design is adopted. The compensation block is embedded in the second connecting groove and the collar is embedded in the corresponding connecting groove to form multiple circumferential and axial limits, which effectively avoids loosening of the connection caused by high frequency vibration, ensures the vibration transmission accuracy, and breaks through the limitation of easy loosening of the existing connection method.

[0015] 2. In this solution, the compensation block fills the assembly gap at the connection between the amplitude transformer and the tool head, reducing vibration energy loss, solving the energy waste problem of existing uncompensated structures, and improving vibration transmission efficiency. The compensation sleeve adopts a detachable design; after wear, only the sleeve body needs to be replaced, without replacing the amplitude transformer or tool head, significantly reducing usage costs and extending overall lifespan. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the main structure of the present utility model;

[0017] Figure 2 This is a schematic diagram of the exploded structure of the main body of this utility model;

[0018] Figure 3 This is a schematic diagram of the exploded cross-section of the main body of this utility model;

[0019] Figure 4 This is a schematic diagram of the compensation sleeve structure of this utility model;

[0020] Figure 5 This is a schematic diagram of the internal structure of the compensation sleeve of this utility model.

[0021] In the figure: 10. Transducer; 11. Amplitude rod; 12. Compensation sleeve; 13. Tool head body; 14. First connecting groove; 15. Second connecting groove; 16. Third connecting groove; 17. Limiting clip; 18. Collar; 19. Compensation block. Detailed Implementation

[0022] To more clearly illustrate the overall concept of this utility model, a detailed description is provided below with reference to the accompanying drawings.

[0023] In the description of this utility model, it should be understood that the terms "center", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "axial", "radial", "circumferential", etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and are not intended to 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 of this utility model.

[0024] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this utility model, "a plurality of" means two or more, unless otherwise explicitly specified.

[0025] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection, an electrical connection, or a communication connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0026] In this invention, unless otherwise expressly specified and limited, the first feature "on" or "below" the second feature may be in direct contact with the first feature, or indirect contact through an intermediate medium. In the description of this specification, references to terms such as "a solution," "some solutions," "example," "specific example," or "some examples," etc., indicate that the specific feature, structure, material, or characteristic described in connection with that solution or example is included in at least one solution or example of this invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same solution or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more solutions or examples.

[0027] Please see Figures 1-5 This utility model proposes a fine-thread ultrasonic strengthening tool head. The tool head includes a transducer 10, an amplitude transformer 11, a compensation sleeve 12, and a tool head body 13. The lower end of the transducer 10 is connected to the upper end of the amplitude transformer 11 by a thread, and the lower end of the amplitude transformer 11 is connected to the upper end of the tool head body 13 by a thread. The lower end of the tool head body 13 is provided with an impact pin for contacting the fine-thread workpiece. The structure of the impact pin is adapted to the fine thread profile and can act precisely on the fine thread surface. The amplitude transformer 11 adopts a structure adapted to high-frequency vibration transmission. Its lower part and the upper part of the tool head body 13 are provided with a second connecting groove 15 that communicates with each other. The second connecting groove 15 is centrally symmetrically distributed to ensure balanced force and stable vibration transmission. On the amplitude transformer 11, a first connecting groove 14 is provided at the upper end of the second connecting groove 15, while on the tool head body 13, a third connecting groove 16 is provided in the middle of the second connecting groove 15. The opening positions of the first connecting groove 14 and the third connecting groove 16 match the structure of the compensation sleeve 12 to realize the positioning and installation of the compensation sleeve 12.

[0028] The shape of the compensation sleeve 12 is perfectly matched to the outer contour of the connection between the amplitude rod 11 and the tool head body 13, and can tightly cover the connection part. A compensation block 19 is fixedly installed on its inner side in a centrally symmetrical arrangement. The structure of the compensation block 19 is adapted to the second connecting groove 15 and can be installed in the second connecting groove 15. A limiting card 17 is provided at the middle position of the inner side of the compensation sleeve 12. The limiting card 17 is used to axially position the compensation sleeve 12 during installation to prevent the compensation sleeve 12 from moving up and down during vibration. A collar 18 is provided at the upper and lower ends of the compensation sleeve 12. The upper collar 18 is adapted to the first connecting groove 14 on the amplitude rod 11, and the lower collar 18 is adapted to the third connecting groove 16 on the tool head body 13. After installation, the collars 18 can be embedded into the corresponding connecting grooves, further enhancing the connection stability between the compensation sleeve 12 and the amplitude rod 11 and the tool head body 13.

[0029] The connection and positioning of each component must follow the principles of coaxiality, tightness, and no gaps. The axes of the transducer 10, the amplitude rod 11, and the tool head body 13 must be collinear to ensure that high-frequency vibration is transmitted axially and to avoid vibration energy loss or component wear due to radial offset. The threaded connection between the amplitude rod 11 and the transducer 10 and the tool head body 13 must be tight and without loose gaps. The fit between the compensation block 19 and the second connecting groove 15 must be tight to fill any possible assembly gaps at the connection between the amplitude rod 11 and the tool head body 13. The inner wall of the compensation sleeve 12 must fit against the outer surface of the amplitude rod 11 and the tool head body 13. The fit between the collar 18 and the connecting groove restricts the circumferential and radial relative displacement of each component and ensures the stability of the overall structure under high-frequency vibration.

[0030] The assembly of this tool head must be performed in a specific sequence to ensure that all components are installed correctly and function properly. First, connect the transducer 10 to the amplitude transformer 11. Fix the amplitude transformer 11 to the special tooling fixture, ensuring its axis is vertical. Then, align the thread at the lower end of the transducer 10 with the thread at the upper end of the amplitude transformer 11, manually screw it in several turns, and then tighten it with a suitable tool to ensure a secure and coaxial connection without any noticeable gaps. Next, connect the amplitude transformer 11 to the tool head body 13. Keeping the amplitude transformer 11 fixed in the tooling fixture, align the thread at the upper end of the tool head body 13 with the thread at the lower end of the amplitude transformer 11, manually screw it in, and then tighten it to ensure a tight fit between the lower end face of the amplitude transformer 11 and the upper end face of the tool head body 13. Simultaneously, confirm that the second connecting groove 15 on the amplitude transformer 11 and the second connecting groove 15 on the tool head body 13 are properly aligned. The grooves 15 are fully aligned to form a connected channel without misalignment. Finally, the compensation sleeve 12 is installed. It is slipped onto the lower end of the tool head body 13 and slowly moved upwards along the axis of the tool head body 13. During this movement, the compensation block 19 inside the compensation sleeve 12 is aligned with the connected second connecting groove 15, allowing the compensation block 19 to gradually embed into the groove. The compensation sleeve 12 continues to move upwards until the limiting clip 17 inside the compensation sleeve 12 abuts against the connection end face of the amplitude transformer 11 and the tool head body 13. At this point, the upper collar 18 of the compensation sleeve 12 is precisely embedded in the first connecting groove 14 on the amplitude transformer 11, and the lower collar 18 is embedded in the third connecting groove 16 on the tool head body 13, completing the installation of the compensation sleeve 12. After assembly, all connections must be checked for looseness or jamming to ensure the overall structure meets the usage requirements.

[0031] The working process of this tool head relies on ultrasonic processing equipment. After assembly, it is installed on the spindle of the ultrasonic processing equipment. The tool head is fixed and its position is adjusted by the equipment spindle so that the impact pin at the lower end of the tool head body 13 is aimed at the fine thread workpiece to be strengthened. After the equipment is started, the transducer 10 converts the input high-frequency electrical signal into mechanical vibration. This mechanical vibration is transmitted to the amplitude transformer 11, which amplifies the amplitude and then transmits it to the tool head body 13. After receiving the vibration, the tool head body 13 drives the impact pin at the lower end to strike the thread surface of the fine thread workpiece at a high frequency, causing plastic deformation of the thread surface. This introduces deep residual compressive stress into the surface layer of the fine thread, ultimately improving the fatigue strength, wear resistance, and stress corrosion resistance of the fine thread.

[0032] Throughout the entire operation, the compensation sleeve 12 plays a crucial role. Its inner compensation block 19 is located in the second connecting groove 15, which can promote the stable connection between the amplitude rod 11 and the tool head body 13 and reduce energy loss during vibration transmission. At the same time, during high-frequency vibration, the compensation sleeve 12 can provide wear compensation at the connection between the amplitude rod 11 and the tool head body 13, avoiding excessive wear at the connection due to long-term use, thereby ensuring the vibration transmission effect and extending the service life of the entire device.

[0033] To ensure the continuous and stable operation of the tool head, regular maintenance and inspection are required. This mainly involves checking for looseness in all threaded connections, displacement of the compensation sleeve 12, and wear on the compensation block 19 and the impact pin. If severe wear of the compensation block 19 is found to affect vibration transmission or connection stability, the compensation sleeve 12 can be removed from the tool head body 13, replaced with a new one, and reinstalled. If the impact pin is worn or deformed due to long-term impact, a suitable impact pin should also be replaced promptly to ensure that the fine thread strengthening effect is not affected.

[0034] Finally, it should be noted that the above embodiments are merely examples for clearly illustrating the present invention and are not intended to limit the implementation. Those skilled in the art can make other variations or modifications based on the above description. It is neither necessary nor possible to exhaustively list all possible implementations here. However, obvious variations or modifications derived therefrom are still within the protection scope of this invention.

Claims

1. A fine-thread ultrasonically reinforced tool head, characterized in that: The device includes a transducer (10), an amplitude rod (11), a compensation sleeve (12), and a tool head body (13). The lower end of the transducer (10) is connected to the upper end of the amplitude rod (11) by a thread. The lower end of the amplitude rod (11) is connected to the upper end of the tool head body (13) by a thread. The compensation sleeve (12) is fitted onto the connection between the amplitude rod (11) and the tool head body (13). The upper and lower ends of the compensation sleeve (12) are respectively provided with a collar (18). The inner side of the compensation sleeve (12) is fixedly installed with compensation blocks (19) arranged in a centrally symmetrical manner.

2. The fine-thread ultrasonically reinforced tool head according to claim 1, characterized in that: The lower part of the amplitude rod (11) and the upper part of the tool head body (13) are provided with a second connecting groove (15) that is interconnected. The second connecting groove (15) is centrally symmetrically distributed.

3. The fine-thread ultrasonically reinforced tool head according to claim 2, characterized in that: The amplitude rod (11) has a first connecting groove (14) at the upper end of the second connecting groove (15), and the tool head body (13) has a third connecting groove (16) at the middle of the second connecting groove (15).

4. The fine-thread ultrasonically reinforced tool head according to claim 1, characterized in that: The shape and size of the compensation block (19) are adapted to the second connecting groove (15), and the compensation block (19) is embedded in the second connecting groove (15).

5. The fine-thread ultrasonically reinforced tool head according to claim 1, characterized in that: The shape of the compensation sleeve (12) is adapted to the outer contour of the connection between the amplitude rod (11) and the tool head body (13).

6. The fine-thread ultrasonically reinforced tool head according to claim 1, characterized in that: The compensation sleeve (12) has an integrally formed limit card (17) at the middle position of its inner side.

7. The fine-thread ultrasonically reinforced tool head according to claim 3, characterized in that: The upper collar (18) of the compensation sleeve (12) is fitted into the first connecting groove (14), and the lower collar (18) of the compensation sleeve (12) is fitted into the third connecting groove (16).

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