A metal surface strengthening device

Abstract

This invention relates to the field of metal surface treatment and discloses a metal surface strengthening device, comprising: an ultrasonic generator for generating ultrasonic frequency electrical signals; an ultrasonic transducer for converting the electrical power of the ultrasonic frequency electrical signals into longitudinal vibration mechanical power of the same frequency; an amplitude transformer for amplifying the mechanical vibration displacement or velocity output by the ultrasonic transducer and transmitting the processed ultrasonic energy to a vibration cavity; and a vibration cavity connected to the amplitude transformer and forming a shot peening chamber with the surface of the part to be treated, for generating ultrasonic frequency vibration as an excitation source for shot peening to strengthen the surface of the part. This method, by driving the shot to perform ultrasonic peening on the surface of the part through ultrasonic vibration of the vibration cavity, improves the effect and efficiency of ultrasonic shot peening on the surface of the part, and can be applied to the inner walls of holes with large aspect ratios and the side walls of narrow spaces.

Description

Technical Field

[0001] This invention relates to the field of metal surface treatment, and in particular to a metal surface strengthening device. Background Technology

[0002] In industries such as aircraft, automobiles, ships, and construction machinery, most of their main components operate under cyclic or random load conditions, and the failure mechanism of these components is mainly fatigue fracture. Currently, shot peening technology can improve the fatigue strength and stress corrosion resistance of metal parts. However, due to the limitations of the part's internal structure, such as cavities and grooves, it is not possible to directly shot peen all parts, especially the inner walls of holes with large length-to-diameter ratios and the side walls of confined spaces.

[0003] When shot peening the inner walls of holes with large aspect ratios and the side walls of narrow spaces, the shot flow angle of existing equipment cannot be adjusted at will. Due to the limitation of space size, the movement trajectory of the shot is approximately parallel to the surface of the part, which is similar to a scraping process and is far from achieving the shot peening effect.

[0004] Adding deflectors and reflectors can improve the impact angle of the shot, but setting a fixed angle means that the position and angle of the shot impacting the part are relatively fixed, resulting in uneven shot peening effect. Furthermore, reflection also leads to energy loss during shot peening, preventing the shot from fully utilizing its energy. Summary of the Invention

[0005] In view of this, the purpose of this invention is to provide a metal surface strengthening device that can improve the effect and efficiency of ultrasonic shot peening on the surface of parts. The specific solution is as follows:

[0006] A metal surface strengthening device, comprising:

[0007] An ultrasonic generator is used to generate electrical signals in the ultrasonic frequency band.

[0008] An ultrasonic transducer, connected to the ultrasonic generator, is used to convert the electrical power of the ultrasonic frequency band electrical signal into longitudinal vibration mechanical power of the same frequency.

[0009] An amplitude transformer, connected to the ultrasonic transducer, is used to amplify the mechanical vibration displacement or velocity output by the ultrasonic transducer and transmit the processed ultrasonic energy to the vibration cavity.

[0010] The vibrating cavity is connected to the amplitude transformer and forms a shot peening chamber with the surface of the part to be treated. It is used to generate ultrasonic frequency vibration as the excitation source for the shot movement, so as to perform ultrasonic shot peening strengthening treatment on the surface of the part to be treated.

[0011] Preferably, in the metal surface strengthening device provided in the embodiments of the present invention, the large end of the vibration cavity is connected to the amplitude transformer, and the contour of the small end matches the contour of the part to be processed.

[0012] The small end of the vibration chamber and the surface of the part to be processed together constitute the motion chamber of the pellet.

[0013] Preferably, in the metal surface strengthening device provided in the embodiments of the present invention, the small end of the vibration cavity has a dumbbell-shaped structure.

[0014] Preferably, in the metal surface strengthening device provided in the embodiments of the present invention, the two ends corresponding to the small end of the vibration cavity are approximately in contact with the surface of the part to be processed.

[0015] Preferably, in the metal surface strengthening device provided in the embodiments of the present invention, the cross-sectional profile at the middle position corresponding to the small end of the vibration cavity is a variable diameter structure, so that the impact direction of the pellets is perpendicular to the surface of the part to be treated.

[0016] Preferably, in the metal surface strengthening device provided in the embodiments of the present invention, the cross-sectional profile at the middle position corresponding to the small end of the vibration cavity is a straight line, a curve, a hollow shape, or a perforated shape.

[0017] Preferably, in the metal surface strengthening device provided in the embodiments of the present invention, when the surface of the part to be treated is an inner hole, the diameter of the small end of the vibration cavity is smaller than the diameter of the inner hole.

[0018] Preferably, in the metal surface strengthening device provided in the embodiments of the present invention, when the surface of the part to be treated is a sidewall, an auxiliary shielding member is provided on the side of the small end of the vibration cavity away from the part to be treated.

[0019] Preferably, in the metal surface strengthening device provided in the embodiments of the present invention, the amplitude transformer is connected to the ultrasonic transducer and the vibration cavity respectively by studs.

[0020] Preferably, in the metal surface strengthening device provided in the embodiments of the present invention, the large end of the amplitude transformer and the vibration cavity are both variable cross-section cylindrical structures; the ultrasonic transducer is a cylindrical structure.

[0021] As can be seen from the above technical solution, the metal surface strengthening device provided by the present invention includes: an ultrasonic generator for generating ultrasonic frequency electrical signals; an ultrasonic transducer connected to the ultrasonic generator for converting the electrical power of the ultrasonic frequency electrical signals into longitudinal vibration mechanical power of the same frequency; an amplitude transformer connected to the ultrasonic transducer for amplifying the mechanical vibration displacement or velocity output by the ultrasonic transducer and transmitting the processed ultrasonic energy to the vibration cavity; and a vibration cavity connected to the amplitude transformer and forming a shot peening chamber with the surface of the part to be treated, for generating ultrasonic frequency vibration as an excitation source for shot peening to strengthen the surface of the part to be treated with ultrasonic shot peening.

[0022] The metal surface strengthening device provided by the present invention utilizes the interaction of an ultrasonic generator, an ultrasonic transducer, an amplitude transformer, and a vibration cavity to generate ultrasonic frequency vibration in the vibration cavity. The vibration cavity and the surface of the part to be treated form a moving chamber for the shot, which meets the sealing requirements of the ultrasonic shot peening cavity. Then, the ultrasonic vibration of the vibration cavity drives the shot to perform ultrasonic shot peening strengthening on the surface of the part to be treated. It can be especially applied to the inner wall of a hole with a large length-to-diameter ratio and the side wall of a narrow space, which improves the effect and efficiency of ultrasonic shot peening on the surface of the part (such as the side wall or inner wall) and improves the surface properties of the part. Attached Figure Description

[0023] To more clearly illustrate the technical solutions in the embodiments of the present invention or related technologies, the drawings used in the description of the embodiments or related technologies will be briefly introduced below. Obviously, the drawings described below are only embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on the provided drawings without creative effort.

[0024] Figure 1 This is a schematic diagram of the structure of the metal surface strengthening device provided in an embodiment of the present invention;

[0025] Figure 2 This is a schematic diagram of ultrasonic shot peening strengthening treatment using the metal surface strengthening device provided in the embodiments of the present invention. Detailed Implementation

[0026] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0027] This invention provides a metal surface strengthening device, such as... Figure 1As shown, it includes:

[0028] Ultrasonic generator 1, used to generate electrical signals in the ultrasonic frequency band;

[0029] The ultrasonic transducer 2 is connected to the ultrasonic generator 1 and is used to convert the electrical power of the ultrasonic frequency band electrical signal into longitudinal vibration mechanical power of the same frequency.

[0030] The amplitude transformer 3 is connected to the ultrasonic transducer 2 and is used to amplify the mechanical vibration displacement or velocity output by the ultrasonic transducer 2 and transmit the processed ultrasonic energy to the vibration cavity.

[0031] The vibrating cavity 4 is connected to the amplitude transformer 3 and forms a motion chamber for the shot 5 with the surface of the part to be treated 6. It is used to generate ultrasonic frequency vibration as the excitation source for the motion of the shot 5, so as to perform ultrasonic shot peening strengthening treatment on the surface of the part to be treated 6.

[0032] It should be noted that the vibration chamber 4 can be understood as an ultrasonic vibration tool rod. This ultrasonic vibration tool rod simultaneously meets the requirements of ultrasonic vibration drive and the sealing requirements of the ultrasonic shot peening chamber. It can drive the shot at close range to strengthen the inner wall of the hole with a large length-to-diameter ratio and the side wall of the narrow space. It uses less shot, and at the same time, the shot peening effect is better and the shot peening efficiency is higher.

[0033] In the metal surface strengthening device provided in the embodiments of the present invention, the interaction of the ultrasonic generator, ultrasonic transducer, amplitude transformer and vibration cavity is used to make the vibration cavity generate ultrasonic frequency vibration, and the vibration cavity and the surface of the part to be treated form a shot movement chamber, which meets the sealing requirements of the ultrasonic shot peening cavity. Then, the ultrasonic vibration of the vibration cavity drives the shot to perform ultrasonic shot peening strengthening on the surface of the part to be treated. It can be applied to the inner wall of the hole with a large length-to-diameter ratio and the side wall of the narrow space, which improves the effect and efficiency of ultrasonic shot peening on the surface of the part (such as the side wall or inner wall) and improves the surface performance of the part.

[0034] In practical applications, the part to be treated 6 is a metal part to be shot peened, which can be a plane, a curved surface, an inner hole, etc. The vibration cavity 4 can be designed into a corresponding shape according to the surface curvature of the part to be treated 6. The cavity section can be set as a circle, a square or an irregular curve, as long as it is kept close to the metal part to be treated to ensure the relative sealing space of the shot.

[0035] In specific implementation, in the metal surface strengthening device provided in the embodiments of the present invention, the large end of the vibrating cavity 4 is connected to the amplitude transformer 3, and the contour of the small end matches the contour of the part to be processed 6; the small end of the vibrating cavity 4 and the surface of the part to be processed 6 together constitute the motion chamber of the pellet 5. The size of the small end of the vibrating cavity 4 is smaller than the size of the large end, and the contour of the small end can be understood as a contouring design. The vibrating cavity 4 can be a single section or multiple sections.

[0036] When the surface of the part to be processed 6 is an inner hole, the small end of the vibrating cavity 4 is inserted into the inner hole to effectively form the motion chamber of the pellet 5. When the surface of the part to be processed 6 is a side wall or other surface, the small end of the vibrating cavity 4 is close to the surface to effectively form the motion chamber of the pellet 5.

[0037] In specific implementation, in the metal surface strengthening device provided in the embodiments of the present invention, the small end of the vibration cavity 4 can be a dumbbell-shaped structure. This dumbbell-shaped structure is thinner in the middle and thicker at both ends. It should be noted that the shape of the small end of the vibration cavity 4 will change depending on the different parts, with the aim of creating a relatively enclosed space for the movement of the pellets and preventing them from falling out.

[0038] When the small end of the vibrating cavity 4 can be a dumbbell-shaped structure, in specific implementation, the two ends of the small end of the vibrating cavity 4 can approximately fit against the surface of the part 6 to be treated; the cross-sectional profile of the middle position corresponding to the small end of the vibrating cavity 4 can be a variable diameter structure so that the impact direction of the shot peening 5 is perpendicular to the surface of the part 6 to be treated. This can greatly improve the shot peening strengthening effect. The variable diameter structure here can be achieved by designing a corresponding profile shape. The two ends of the dumbbell-shaped structure are the main driving force, and the middle position, through a corresponding profile shape, assists in the reversal of the shot peening while vibrating, increasing the impact on the sidewall.

[0039] Preferably, the cross-sectional profile at the middle position corresponding to the small end of the vibration cavity 4 can be set as a straight line, a curve, a hollow shape, or a perforated shape, or it can be set as other irregular shapes. When processing round holes, square holes, or hopper holes, the cross-sectional profile at the middle position corresponding to the small end of the vibration cavity 4 can be changed accordingly.

[0040] In a specific implementation, in the metal surface strengthening device provided in the embodiments of the present invention, when the surface of the part 6 to be treated is an inner hole, the diameter of the small end of the vibration cavity 4 is smaller than the diameter of the inner hole, so that the small end can be inserted into the inner hole.

[0041] In addition, in specific implementation, in the metal surface strengthening device provided in the embodiments of the present invention, when the surface of the part to be treated 6 is a sidewall, an auxiliary shielding member can be provided on the side of the small end of the vibration cavity 4 away from the part to be treated 6, forming a space similar to a hole.

[0042] In a specific implementation, in the metal surface strengthening device provided in the embodiments of the present invention, the amplitude transformer 3 is connected to the ultrasonic transducer 2 and the vibration cavity 4 respectively through studs.

[0043] In specific implementation, in the metal surface strengthening device provided in the embodiments of the present invention, the large end of both the amplitude transformer 3 and the vibration cavity 4 is a variable cross-section cylindrical structure. The ultrasonic transducer 2 is a cylindrical structure. The structure of the ultrasonic transducer 2 is the same as that of the piezoelectric ceramic transducer, which can convert the input electrical power into longitudinal vibration mechanical power (i.e., ultrasonic waves) of the same frequency and then transmit it out. The pellets 5 are spheres, and the material of the pellets 5 can be metal, ceramic, glass, etc.

[0044] The working process of the metal surface strengthening device provided in the embodiments of the present invention is described below, and the specific steps are as follows:

[0045] like Figure 1 and Figure 2 As shown, the ultrasonic generator 1 generates a high-frequency electrical signal, which is transmitted to the ultrasonic transducer 2 and converted into axial mechanical vibration of the same frequency. The vibration energy passes through the amplitude transformer 3 and ultimately causes the vibration cavity 4 to vibrate at a large amplitude frequency. Specifically, this puts the entire vibration cavity 4 in a resonant state, making it both a component of the closed space for the movement of the shot 5 and the excitation source for the shot 5, significantly increasing the vibration excitation area. All parts of the vibration cavity 4 in contact with the shot 5 undergo ultrasonic vibration (including the small end of the vibration cavity 4), thus achieving efficient driving at any angle and being unrestricted by position and angle in practical applications. Through the variable diameter feature of the middle section where the vibration cavity 4 contacts the shot 5, while exciting the movement of the shot 5, the impact direction of the shot 5 is effectively changed to be perpendicular or nearly perpendicular to the surface of the part 6 to be treated, greatly improving the impact energy and shot peening effect on the inner hole or sidewall.

[0046] It is important to emphasize that the operation of the vibration chamber 4 achieves multiple objectives, including sealing the cavity, ultrasonic vibration excitation of the pellets 5, and conversion of the impact direction of the pellets 5, thereby improving the effect and efficiency of ultrasonic shot peening in confined spaces and internal pores. Furthermore, the vibration chamber 4 provides omnidirectional vibration excitation; compared to a single vibrating head, this invention is not limited by placement angle and can be excited at any angle, thus expanding its applicability.

[0047] The various embodiments in this specification are described in a progressive manner. Each embodiment focuses on the differences from other embodiments. The same or similar parts between the various embodiments can be referred to each other.

[0048] Finally, it should be noted that in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0049] The metal surface strengthening device provided by the present invention has been described in detail above. Specific examples have been used to illustrate the principle and implementation of the present invention. The description of the above embodiments is only for the purpose of helping to understand the method and core idea of ​​the present invention. At the same time, for those skilled in the art, there will be changes in the specific implementation and application scope based on the idea of ​​the present invention. Therefore, the content of this specification should not be construed as a limitation of the present invention.

Claims

1. A metal surface strengthening device, characterized in that, include: An ultrasonic generator is used to generate electrical signals in the ultrasonic frequency band. An ultrasonic transducer, connected to the ultrasonic generator, is used to convert the electrical power of the ultrasonic frequency band electrical signal into longitudinal vibration mechanical power of the same frequency. An amplitude transformer, connected to the ultrasonic transducer, is used to amplify the mechanical vibration displacement or velocity output by the ultrasonic transducer and transmit the processed ultrasonic energy to the vibration cavity. The large end of the vibrating cavity is connected to the amplitude transformer, and the contour of the small end of the vibrating cavity matches the contour of the part to be treated; the size of the small end of the vibrating cavity is smaller than the size of the large end; the small end of the vibrating cavity and the surface of the part to be treated together constitute the motion chamber of the shot; the vibrating cavity is used to generate ultrasonic frequency vibration as the excitation source for the motion of the shot, so as to perform ultrasonic shot peening strengthening treatment on the surface of the part to be treated; the vibrating cavity is shaped to accommodate the surface curvature changes of the part to be treated. The cross-sectional profile at the middle position corresponding to the small end of the vibration cavity is a variable diameter structure. Through the variable diameter structure that contacts the pellet, while exciting the pellet to move, the impact direction of the pellet is changed to be perpendicular or nearly perpendicular to the surface of the part to be processed. When the surface of the part to be processed is a sidewall, an auxiliary shielding member is provided on the side of the small end of the vibration cavity away from the part to be processed.

2. The metal surface strengthening device according to claim 1, characterized in that, The small end of the vibration cavity has a dumbbell-shaped structure.

3. The metal surface strengthening device according to claim 2, characterized in that, The two ends of the small end of the vibration cavity are approximately in contact with the surface of the part to be processed.

4. The metal surface strengthening device according to claim 3, characterized in that, The cross-sectional profile at the middle position corresponding to the small end of the vibration cavity is a straight line or a curve.

5. The metal surface strengthening device according to claim 4, characterized in that, When the surface of the part to be processed is an inner hole, the diameter of the small end of the vibration cavity is smaller than the diameter of the inner hole.

6. The metal surface strengthening device according to claim 1, characterized in that, The amplitude transformer is connected to the ultrasonic transducer and the vibration cavity respectively via studs.

7. The metal surface strengthening device according to claim 1, characterized in that, Both the amplitude transformer and the large end of the vibration cavity are variable cross-section cylindrical structures; the ultrasonic transducer is a cylindrical structure.

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