An ultrasonic shot peening device and method for a plate welding joint

Abstract

This invention belongs to the field of shot peening technology for metal surfaces, and discloses an ultrasonic shot peening device and method for welded joints of plates. The device includes an ultrasonic vibration device, an ultrasonic fixing device, a processing table, and a workpiece fixing fixture. The ultrasonic vibration device is fixed at the center of the ultrasonic fixing device. Multiple telescopic rods connect the ultrasonic fixing device and the processing table. A shot peening chamber is formed on the processing table, corresponding to the top of the ultrasonic vibration device, with the top of the ultrasonic vibration device extending into the shot peening chamber. A joint detection sensor is installed on the front side of the shot peening chamber and connected to a display. Multiple workpiece fixing fixtures are slidably connected to the top surface of the processing table, and the plate is detachably connected to the top surface of the workpiece fixing fixtures. This invention uses a laser displacement sensor to detect the welded joint and adjusts the processing position using the workpiece fixing fixtures, thus ensuring uniform shot peening of the welded joint and improving its fatigue resistance, corrosion resistance, and wear resistance.

Description

Technical Field

[0001] This invention belongs to the field of metal surface shot peening technology, specifically relating to an ultrasonic shot peening device and method for welded joints of plates. Background Technology

[0002] The statements in this section are merely background information related to the present invention and do not necessarily constitute prior art.

[0003] Multiple plates are typically joined by welding. During service, these welded joints are prone to failure due to wear, corrosion, and fatigue fracture. Failure usually begins at the weakest point, therefore the microstructure and properties of the welded joint surface directly affect the overall performance of the joint. Ultrasonic shot peening can refine the surface grains, induce plastic deformation in the material's surface, and achieve an ideal microstructure and residual compressive stress distribution, thus improving the overall performance of the joint.

[0004] For example, an existing technology discloses an ultrasonic shot peening strengthening device for long thin plate test pieces, which includes an ultrasonic vibration device installed on a scissor lift platform. Above the ultrasonic vibration device are a frame and a roller frame. The roller frame adopts a double-layer roller design. While the lower roller drives the test piece, the upper roller counteracts the force from the ultrasonic shot peening, preventing the test piece from bending and deforming.

[0005] The above solution has the following drawbacks: The above solution is suitable for strengthening continuous plates, but it cannot accurately position and coaxially align the welded joints of the plates. The shot-peening strengthening area is prone to deviating from the core area of ​​the weld, resulting in uneven surface strengthening of the welded joint and an unsatisfactory distribution of residual compressive stress, which cannot effectively improve the fatigue resistance, corrosion resistance and wear resistance of the joint. Summary of the Invention

[0006] In view of this, the purpose of the present invention is to provide an ultrasonic shot peening device and method for welded joints of plates, which can solve the technical problem of the inability to accurately locate the welded joints of plates in the prior art, resulting in uneven surface strengthening of the welded joints.

[0007] To achieve the above objectives, the present invention adopts the following technical solution: In one aspect, an ultrasonic shot peening strengthening device for welded joints of plates is provided, comprising an ultrasonic vibration device, an ultrasonic fixing device, a processing table, and a workpiece fixing fixture; The ultrasonic vibration device is fixed at the center of the ultrasonic fixing device; multiple telescopic rods are connected between the ultrasonic fixing device and the processing table; a shot peening chamber is opened on the processing table; the shot peening chamber corresponds to the top of the ultrasonic vibration device, and the top of the ultrasonic vibration device extends into the shot peening chamber; a joint detection sensor is set on the front side of the shot peening chamber; the joint detection sensor is connected to the display. Multiple workpiece fixing fixtures are slidably connected to the top surface of the processing table, and the plate can be detachably connected to the top surface of the workpiece fixing fixtures.

[0008] Furthermore, the ultrasonic vibration device includes an ultrasonic generator, an ultrasonic transducer, an ultrasonic amplitude transformer, a vibration head, a cable connector, and a clamping base; a cable connector is provided at the bottom of the ultrasonic transducer, and the cable connector is connected to the ultrasonic generator through a cable; the ultrasonic amplitude transformer is fixedly connected to the top of the ultrasonic transducer, and the vibration head is fixedly connected to the top of the ultrasonic amplitude transformer, with the vibration head extending into the shot peening chamber; the clamping base is fixedly connected to the outer periphery of the bottom end of the ultrasonic amplitude transformer, and the clamping base is detachably connected to the center of the ultrasonic fixing device.

[0009] Furthermore, the ultrasonic fixation device includes a base, bottom columns, a middle seat, and fasteners. The middle seat is connected to the base through four bottom columns. A mounting opening is provided in the center of the middle seat. The bottom end of the ultrasonic transducer passes through the mounting opening. The clamping seat is attached to the top surface of the middle seat and connected by fasteners.

[0010] Furthermore, the telescopic rod is marked with a vertical scale.

[0011] Furthermore, the processing table is provided with bosses on both sides and in the middle. The middle boss is higher than the bosses at both ends. There are side guide rail grooves on both sides of the middle boss and top guide rails are installed on the bosses at both ends. One end of the workpiece fixing fixture is slidably connected to the top guide rail, and the other end is slidably connected to the side guide rail groove. The top surface of the workpiece fixing fixture is flush with the top surface of the middle boss.

[0012] Furthermore, two workpiece fixing fixtures are installed on each side of the processing table. The distance between the workpiece fixing fixtures can be adjusted to clamp plates of different sizes.

[0013] Furthermore, the workpiece fixing fixture includes a slider and a clamping mechanism. The clamping mechanism is fixed on the slider and clamps the plate onto the slider. One end of the slider is provided with a guide rail groove, which is slidably connected to the top guide rail of the two end bosses. The other end of the slider is provided with a side guide rail, which is slidably connected in the side guide rail groove.

[0014] Furthermore, the clamping mechanism includes a pressure plate, a support screw, a double-ended stud, and an adjusting nut; The double-ended stud is fixedly connected to the top surface of the slider, the pressure plate is sleeved on the outer periphery of the double-ended stud, and the top of the double-ended stud is threaded to the adjusting nut. The support screw is threaded to the top surface of the slider, and a limiting groove is opened on the bottom surface of one end of the pressure plate, which is locked onto the top surface of the support screw.

[0015] Furthermore, a horizontal scale is marked on the shot peening chamber on the middle boss, and the end of the pressure plate away from the limiting groove is designed as a pointed tip pointing to the horizontal scale.

[0016] Secondly, a strengthening method for the ultrasonic shot peening device used in welded joints of plates, as described above, is provided, comprising the following steps: Install the ultrasonic vibration device and adjust the telescopic rod to adjust the processing table to the set shot peening distance; The sheet metal is placed on multiple workpiece clamps on the processing table. The position of the weld joint of the sheet metal is located by the joint detection sensor, and the sheet metal is fixed on the processing table by the workpiece clamps. Turn on the start switch on the ultrasonic generator to perform shot peening. After processing a preset position, move the workpiece fixing fixture and observe the horizontal scale. Move the plate forward to the next preset position for shot peening until the shot peening of the plate weld joint is completed.

[0017] Compared with the prior art, the advantages and positive effects of this invention are: This invention discloses an ultrasonic shot peening device for welded joints of plates. A telescopic rod controls the lifting and lowering of the worktable, thereby adjusting the relative position of the top of the ultrasonic vibration device and the shot peening chamber, and adjusting the shot peening distance to adapt to plates of different thicknesses. A laser displacement sensor detects the position of the welded joint, ensuring that the shot peening chamber corresponds to the welded joint position, preventing the shot peening strengthening area from deviating from the core area of ​​the weld. A sliding and adjustable workpiece clamp allows for adjustment of the processing position of the welded joint, ensuring the repeatability of the shot peening process. It can complete the shot peening of all welded joints of plates, achieving the technical effects of ensuring uniform shot peening on the welded joint surface and improving the fatigue resistance, corrosion resistance, and wear resistance of the welded joint. Attached Figure Description

[0018] The accompanying drawings, which form part of this invention, are used to provide a further understanding of the invention. The illustrative embodiments of the invention and their descriptions are used to explain the invention and do not constitute an improper limitation of the invention.

[0019] Figure 1 This is a schematic diagram of the structure of an ultrasonic shot peening strengthening device for welded joints of plates according to Embodiment 1 or 2 of the present invention; Figure 2 This is a schematic diagram of the ultrasonic vibration device according to Embodiment 1 or 2 of the present invention; Figure 3 This is a schematic diagram of the processing table in Embodiment 1 or 2 of the present invention; Figure 4 This is a schematic diagram of the workpiece fixing fixture according to Embodiment 1 or 2 of the present invention; Figure 5 This is a schematic diagram of the structure of the pressure plate in Embodiment 1 or 2 of the present invention; In the picture: 1. Ultrasonic vibration device; 11. Ultrasonic generator; 12. Ultrasonic transducer; 13. Ultrasonic amplitude transformer; 14. Vibration head; 15. Cable connector; 16. Mounting base; 2. Ultrasonic fixation device; 21. Base; 22. Base column; 23. Middle seat; 3. Machining table; 31. End bosses; 32. Middle boss; 33. Top guide rail; 34. Shot peening chamber; 35. Side guide rail groove; 36. Sensor mounting groove; 37. Wire groove; 38. Annular groove; 4. Workpiece fixing fixture; 41. Slider; 42. Support screw; 43. Pressure plate; 44. Adjusting nut; 45. Double-ended stud; 46. Limiting groove; 5. Connector detection sensor; 51. Display; 6. Telescopic pole. Detailed Implementation

[0020] It should be noted that the following detailed description is illustrative and intended to provide further explanation of the invention. Unless otherwise specified, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains.

[0021] The present invention will now be described in detail with reference to the accompanying drawings.

[0022] Example 1 This embodiment discloses an ultrasonic shot peening strengthening device for welded joints of plates, such as... Figure 1 As shown, it includes an ultrasonic vibration device 1, an ultrasonic fixing device 2, a processing table 3, and a workpiece fixing fixture 4. Figure 1 As shown, the processing table 3 carries the plate to be processed, the workpiece fixing fixture 4 is used to fix the plate on the processing table 3 and move the plate relative to the processing table 3, the ultrasonic vibration device 1 is responsible for generating high frequency vibration to perform ultrasonic shot peening on the welded joint of the plate, and the ultrasonic fixing device 2 is used to support the ultrasonic vibration device 1 and the processing table 3.

[0023] like Figure 1 As shown, the ultrasonic vibration device 1 is fixed at the center of the ultrasonic fixing device 2. Multiple telescopic rods 6 connect the ultrasonic fixing device 2 and the processing table 3. A shot peening chamber 34 is provided on the processing table 3, corresponding to the top end of the ultrasonic vibration device 1, with the top end of the ultrasonic vibration device 1 extending into the shot peening chamber 34. It can be understood that adjusting the length of the telescopic rods 6 can adjust the position of the ultrasonic fixing device 2 relative to the processing table 3, thereby adjusting the relative position of the top end of the ultrasonic fixing device 2 and the shot peening chamber 34, and thus adjusting the shot peening distance.

[0024] like Figure 3As shown, the joint detection sensor 5 is located on the front side of the shot peening chamber 34 to monitor the position information of the weld joint, thereby facilitating the adjustment of the clamping position of the plate and aligning the weld joint of the plate with the shot peening chamber 34, ensuring that the top of the ultrasonic vibration device 1 can directly act on the weld joint area. For example, the joint detection sensor 5 can be a laser sensor, which determines the joint position by detecting the obstruction of the beam.

[0025] Understandably, because the weld joint is located on the bottom surface of the plate, the operator cannot observe from the bottom surface of the processing table 3 whether the weld joint is aligned with the shot peening chamber 34. Therefore, as... Figure 1 As shown, the joint detection sensor 5 is connected to the display 51 to display the detected weld joint position information in real time, guiding the adjustment of the plate clamping position. In this embodiment, the joint detection sensor 5 is a laser displacement sensor, which determines its position by detecting changes in the surface height or shape at the weld joint. The display 51 is used to present visual information. By displaying the position information in real time, the operator can intuitively see the deviation of the weld joint relative to the shot peening chamber 34 or the preset processing area, thereby adjusting the plate clamping position accordingly.

[0026] It is also understandable that the joint detection sensor 5 is connected to the display 51 and displays the welding joint position information in real time, providing operators with intuitive and accurate positioning basis, reducing the error of manual judgment, ensuring that the welding joint can be accurately positioned in the processing area of ​​the ultrasonic shot peening device, and simplifying the clamping process of the plate.

[0027] like Figure 3 As shown, on the front side of the shot peening chamber 34, a sensor mounting slot 36 and a wire groove 37 are provided on the central boss 32. The connector detection sensor 5 is installed in the sensor mounting slot 36 to detect the plate material passing through the sensor mounting slot 36. It can be understood that the wires between the connector detection sensor 5 and the display 51 are installed in the wire groove 37.

[0028] In some embodiments, an annular groove 38 is provided circumferentially at the top opening of the shot peening chamber 34 for installing an annular seal. The annular seal can be made of wear-resistant rubber, polyurethane, silicone or other flexible wear-resistant materials. Its upper end face is higher than the top surface of the processing table by a set height (e.g., 1-3mm) to form elastic contact with the surface of the plate to be strengthened after the plate is clamped. The annular seal undergoes elastic compression under the clamping force and forms continuous circumferential elastic contact with the surface of the plate to be strengthened, thereby compensating for minor unevenness of the plate surface, local excess height of weld joints, flash or clamping errors that cause small gaps, improving the sealing of the shot peening chamber and reducing the overflow of shot from the gap between the shot peening chamber and the plate.

[0029] Understandably, the annular seal is positioned around the opening of the shot peening chamber, neither obstructing the shot-peened area of ​​the weld joint nor affecting the impact strengthening effect of the shot on the weld joint surface. For weld joints of plate materials with relatively flat surfaces or those that have undergone surface smoothing treatment, the annular seal can directly adhere to the plate surface. For weld joints with slight weld reinforcement, local burrs, or plate flatness errors, compensation can be made through the elastic deformation of the annular seal. If necessary, annular seals of different thicknesses can be selected according to the height of the weld joint to improve the adaptability of the device to different types of plate weld joints.

[0030] like Figure 1 As shown, multiple workpiece clamps 4 are slidably connected to the top surface of the processing table 3, and the sheet metal is detachably connected to the top surface of the workpiece clamps 4. It can be understood that after the top of the ultrasonic vibration device 1 aligns with the welding joint position, the sheet metal is clamped to the top surface of the processing table 3 by the workpiece clamps 4, preventing displacement of the sheet metal during shot peening. The workpiece clamps 4 can move on the top surface of the processing table 3, which not only adapts to the clamping requirements of sheets of different sizes, but also allows adjustment of the sheet metal position and the processing position of the welding joint during shot peening.

[0031] Understandably, compared to existing devices suitable for strengthening continuous plates, this embodiment solves the problem of determining the position and aligning the welded joint of the plate with its axis by introducing a joint detection sensor 5 and a slidingly adjustable workpiece clamp 4. Furthermore, through the multiple telescopic rods 6 connecting the ultrasonic fixing device 2 and the processing table 3, this embodiment provides the ability to adjust the shot peening distance, enabling the device to adapt to plates of different thicknesses.

[0032] like Figure 2 As shown, the ultrasonic vibration device 1 includes an ultrasonic generator 11, an ultrasonic transducer 12, an ultrasonic amplitude transformer 13, a vibration head 14, a cable connector 15, and a clamping base 16. The ultrasonic transducer 12 is provided with a cable connector 15 at its bottom end, and the cable connector 15 is connected to the ultrasonic generator 11 through a cable. The ultrasonic amplitude transformer 13 is fixedly connected to the top end of the ultrasonic transducer 12, and the vibration head 14 is fixedly connected to the top end of the ultrasonic amplitude transformer 13. The vibration head 14 extends into the shot peening chamber 34. The clamping base 16 is fixedly connected to the outer periphery of the bottom end of the ultrasonic amplitude transformer 13, and the clamping base 16 is detachably connected to the center of the top surface of the ultrasonic fixing device 2.

[0033] In this embodiment, the ultrasonic generator 11 provides electrical energy to the ultrasonic transducer 12, which converts the electrical energy into mechanical vibration energy. The ultrasonic amplitude transformer 13 amplifies the vibration generated by the ultrasonic transducer 12 and transmits it to the vibrating head 14 to increase the shot peening energy. The clamping base 16 stably mounts the ultrasonic vibration device 1 onto the ultrasonic fixing device 2, ensuring the positioning accuracy and operational stability of the vibration device. In some embodiments, the clamping base 16 is connected to the ultrasonic fixing device 2 by fasteners; for example, the clamping base 16 adopts a flange structure with bolt holes and is connected to the ultrasonic fixing device 2 by bolts.

[0034] like Figure 1 As shown, the ultrasonic fixing device 2 includes a base 21, bottom columns 22, and a middle seat 23. The middle seat 23 is connected to the base 21 through four bottom columns 22. The middle seat 23 has a mounting opening in the center. The bottom end of the ultrasonic transducer 12 passes through the mounting opening. The clamping seat 16 is attached to the top surface of the middle seat 23 and connected with fasteners to prevent the ultrasonic vibration device 1 from loosening or shifting during operation, thereby ensuring the stability and accuracy of the shot peening process.

[0035] Understandably, the base 21 provides a stable mounting platform for the entire ultrasonic mounting device 2 and bears the weight of the upper components and the reaction force during operation. The mounting opening matches the external dimensions of the ultrasonic transducer 12 so that the ultrasonic transducer 12 can be correctly positioned and installed. It is also understandable that this detachable connection facilitates the disassembly, maintenance, and installation of the ultrasonic vibration device 1.

[0036] In this embodiment, the telescopic rod 6 is a sleeve-type telescopic rod, with the inner sleeve and outer sleeve slidably connected. A locking bolt is threaded onto the outer sleeve, and tightening the locking bolt limits the movement of the inner sleeve relative to the outer sleeve. A vertical scale is provided on the inner sleeve. By observing the vertical scale on the inner sleeve and adjusting the extension and retraction of the telescopic rod 6, the relative distance between the ultrasonic vibration device 1 and the plate can be adjusted to ensure that the ultrasonic shot peening process is carried out at the optimal working distance. By providing a vertical scale on the telescopic rod 6, the operator can intuitively and accurately read the current extension and retraction status of the telescopic rod 6, thereby achieving quantitative control of the shot peening distance. This design improves the accuracy and repeatability of the shot peening distance setting and avoids distance deviations caused by experience judgment or visual errors.

[0037] like Figure 3As shown, the processing table 3 has bosses on both sides and in the middle. The middle boss 32 is higher than the two end bosses 31. This height difference design aims to form a stepped structure. Side guide rail grooves 35 are provided on both sides of the middle boss 32, and top guide rails 33 are installed on the two end bosses 31. One end of the workpiece fixing fixture 4 is slidably connected to the top guide rail 33, and the other end is slidably connected to the side guide rail groove 35. The top surface of the workpiece fixing fixture 4 is flush with the top surface of the middle boss 32. This design ensures that the sheet metal can be placed horizontally on the processing table 3. The workpiece fixing fixture 4 not only fixes the sheet metal but also provides support, ensuring that the welded joint of the sheet metal fits snugly with the shot peening chamber 34. In this embodiment, the middle boss 32 is higher than the two end bosses 31 by the height of the top guide rail 33.

[0038] It is understandable that by designing the side guide rail groove 35 and the top guide rail 33, the workpiece fixing fixture 4 is provided with horizontal guidance and horizontal and longitudinal limits, so as to prevent the workpiece fixing fixture 4 from tilting or shaking during the sliding process, and to keep the workpiece fixing fixture 4 in a position of high accuracy. This ensures that the plate welded joint is always in the best processing position during the ultrasonic shot peening process and has repeatability of operation.

[0039] like Figure 1 As shown, each side of the processing table 3 is slidably connected to two workpiece fixing clamps 4. When a plate of a specific size needs to be shot peened, the operator can adjust the spacing of the workpiece fixing clamps 4 by sliding the workpiece fixing clamps 4 according to the actual size of the plate until the plate can be securely clamped between the multiple workpiece fixing clamps 4.

[0040] like Figure 4 As shown, the workpiece fixing fixture 4 includes a slider 41 and a clamping mechanism. The clamping mechanism is fixed on the slider 41 and clamps the plate onto the slider 41, and adjusts its position according to the slider 41. One end of the slider 41 is provided with a guide rail groove, which is slidably connected to the top surface guide rail 33 of the two end bosses 31. The other end of the slider 41 is provided with a side guide rail, which is slidably connected in the side guide rail groove 35.

[0041] In some embodiments, the guide rail groove is designed as a trapezoidal groove, and the top guide rail 33 is designed as a trapezoidal guide rail. The trapezoidal groove and the trapezoidal guide rail cooperate to linearly guide the slider 41. The side guide rail is designed as a protruding strip structure, which cooperates with the groove to provide lateral positioning and anti-deflection function for the slider 41.

[0042] like Figure 4 As shown, the clamping mechanism includes a pressure plate 43, a support screw 42, a double-ended stud 45, and an adjusting nut 44. The double-ended stud 45 is fixedly connected to the top surface of the slider 41, the pressure plate 43 is sleeved around the outer periphery of the double-ended stud 45, and the adjusting nut 44 is threadedly connected to the top of the double-ended stud 45. The support screw 42 is threadedly connected to the top surface of the slider 41, as shown... Figure 5As shown, a limiting groove 46 is formed on the bottom surface of one end of the pressure plate 43. When the pressure plate 43 rotates relative to the double-ended stud 45, the limiting groove 46 of the pressure plate 43 is engaged with the top surface of the support screw 42. After the plate is placed on the top surface of the slider 41, the height of the support screw 42 can be adjusted so that the bottom surface of the pressure plate 43 is in contact with the top surface of the plate. Then, the adjusting nut 44 is rotated to tighten the pressure plate 43, fixing the plate to the top surface of the slider 41. After the ultrasonic shot peening of the plate is completed, the adjusting nut 44 is loosened, and the pressure plate 43 can be rotated to remove the plate.

[0043] Understandably, the double-ended stud 45 is a rod-shaped fastener with threads at both ends. One end is fixed to the top surface of the slider 41, and the other end is threaded to the adjusting nut 44. The adjusting nut 44 and the double-ended stud 45 are threaded together to achieve the pressing or loosening of the sheet metal. The support screw 42 provides limiting and support for the pressure plate 43. The limiting groove 46 on the bottom surface of one end of the pressure plate 43 cooperates with the top surface of the support screw 42, providing positioning and limiting functions when the pressure plate 43 rotates. It mainly provides an adjustable height support point for the sheet metal, so that the pressure plate 43 can adapt to sheet metal of different thicknesses and avoid excessive pressure on the sheet metal when the adjusting nut 44 is tightened. In this embodiment, the shape and size of the limiting groove 46 match the top end of the support screw 42, for example, a U-shaped groove.

[0044] It is also understandable that by introducing the adjustable height design of the adjusting nut 44 and the rotation limiting mechanism of the pressure plate 43 and the support screw 42, the clamping mechanism can flexibly cope with plates of various thicknesses without frequently changing the clamping parts.

[0045] In this embodiment, a horizontal scale is marked on the rear of the shot peening chamber 34 on the intermediate boss 32, such as... Figure 5 As shown, the end of the pressure plate 43 furthest from the limiting groove 46 is designed as a pointed tip pointing towards the horizontal scale. After ultrasonic shot peening at a set position, the workpiece fixing fixture 4 is moved to the next set position for ultrasonic shot peening, ultimately achieving shot peening of the entire welded joint. The horizontal scale provides a visual and quantitative positioning reference for the movement of the workpiece above the shot peening chamber 34. It can be understood that the operator can manually push or pull the workpiece fixing fixture 4 to slide it on the guide rail, while observing the alignment of the tip of the pressure plate 43 with the horizontal scale, thus moving the workpiece to the next preset shot peening position. Through this segmented movement and shot peening, comprehensive and uniform strengthening of the entire welded joint can ultimately be achieved.

[0046] Example 2 This embodiment discloses an ultrasonic shot peening strengthening method for welded joints of plates, which applies an ultrasonic shot peening strengthening device for welded joints of plates disclosed in Embodiment 1, and specifically includes the following steps: First, the ultrasonic vibration device 1 is clamped, and the height of the processing table 3 is adjusted to the set shot peening distance by adjusting the telescopic rod 6. Then, the plate is placed on multiple workpiece fixing fixtures 4 on the processing table, the position of the welded joint of the plate is located by the joint detection sensor 5, and the plate is fixed on the processing table by the workpiece fixing fixtures 4. Then, connect the ultrasonic transducer 12 of the ultrasonic vibration device 1 to the ultrasonic generator 11, and set the required power, frequency and shot peening time on the ultrasonic generator 11; then, turn on the start switch on the ultrasonic generator 11 to perform shot peening. Finally, after processing one preset shot peening position, observe the horizontal scale on the middle boss 32 to determine the next preset shot peening position, and at the same time move the workpiece fixing fixture 4 to move the plate forward to the next preset shot peening position for shot peening processing, until the shot peening of the entire welded joint is completed.

[0047] While the specific embodiments of the present invention have been described above in conjunction with the accompanying drawings, this is not intended to limit the scope of protection of the present invention. Those skilled in the art should understand that various modifications or variations that can be made by those skilled in the art without creative effort based on the technical solutions of the present invention are still within the scope of protection of the present invention.

Claims

1. An apparatus for ultrasonic peening of a welded joint of a plate, characterized by, Includes ultrasonic vibration device, ultrasonic fixing device, processing table, and workpiece fixing fixture; The ultrasonic vibration device is fixed at the center of the ultrasonic fixing device; multiple telescopic rods are connected between the ultrasonic fixing device and the processing table; a shot peening chamber is opened on the processing table; the shot peening chamber corresponds to the top of the ultrasonic vibration device, and the top of the ultrasonic vibration device extends into the shot peening chamber; a joint detection sensor is set on the front side of the shot peening chamber; the joint detection sensor is connected to the display. The top surface of the processing table is slidably connected to multiple workpiece fixing fixtures, and the plate is detachably connected to the top surface of the workpiece fixing fixtures.

2. The ultrasonic shot peening strengthening device for welded joints of plates as described in claim 1, characterized in that, The ultrasonic vibration device includes an ultrasonic generator, an ultrasonic transducer, an ultrasonic amplitude transformer, a vibration head, a cable connector, and a clamping base. The ultrasonic transducer has a cable connector at its bottom, which is connected to the ultrasonic generator via a cable. The ultrasonic amplitude transformer is fixedly connected to the top of the ultrasonic transducer, and the vibration head is fixedly connected to the top of the ultrasonic amplitude transformer, with the vibration head extending into the shot peening chamber. The clamping base is fixedly connected to the outer periphery of the bottom of the ultrasonic amplitude transformer and is detachably connected to the center of the ultrasonic fixing device.

3. An apparatus for ultrasonic peening of a welded joint of a sheet metal according to claim 2, wherein The ultrasonic fixing device includes a base, bottom columns, a middle seat, and fasteners. The middle seat is connected to the base through four bottom columns. A mounting opening is provided in the center of the middle seat, through which the bottom end of the ultrasonic transducer passes. The clamping seat is attached to the top surface of the middle seat and connected by fasteners.

4. The apparatus for ultrasonic peening of a welded joint of a sheet metal according to claim 1, wherein The telescopic rod is marked with a vertical scale.

5. The apparatus for ultrasonic peening of a welded joint of a sheet metal according to claim 1, wherein The processing table is provided with bosses on both sides and in the middle. The middle boss is higher than the bosses at both ends. There are side guide rail grooves on both sides of the middle boss and top guide rails are installed on the bosses at both ends. One end of the workpiece fixing fixture is slidably connected to the top guide rail, and the other end is slidably connected to the side guide rail groove. The top surface of the workpiece fixing fixture is flush with the top surface of the middle boss.

6. An apparatus for ultrasonic peening of a welded joint of a plate according to claim 5, wherein Two workpiece fixing fixtures are installed on each side of the processing table. The distance between the workpiece fixing fixtures can be adjusted to clamp plates of different sizes.

7. An apparatus for ultrasonic peening of a welded joint of a plate according to claim 6, wherein The workpiece fixing fixture includes a slider and a clamping mechanism. The clamping mechanism is fixed on the slider and clamps the plate onto the slider. One end of the slider is provided with a guide rail groove, which is slidably connected to the top guide rail of the two end bosses. The other end of the slider is provided with a side guide rail, which is slidably connected in the side guide rail groove.

8. The apparatus for ultrasonic peening of a welded joint of a sheet metal according to claim 7, wherein The clamping mechanism includes a pressure plate, a support screw, a double-ended stud, and an adjusting nut; The double-ended stud is fixedly connected to the top surface of the slider, and the pressure plate is sleeved on the outer circumference of the double-ended stud. The top of the double-ended stud is threaded with an adjusting nut. The support screw is threadedly connected to the top surface of the slider, and a limiting groove is opened on the bottom surface of one end of the pressure plate. The limiting groove is locked onto the top surface of the support screw.

9. The apparatus for ultrasonic peening of a welded joint of a sheet metal according to claim 8, wherein A horizontal scale is marked on the shot peening chamber on the middle boss, and the end of the pressure plate away from the limiting groove is designed as a pointed tip pointing to the horizontal scale.

10. A strengthening method for an ultrasonic shot peening device for welded joints of plates as described in any one of claims 1-9, characterized in that, Includes the following steps: Install the ultrasonic vibration device and adjust the telescopic rod to adjust the processing table to the set shot peening distance; The sheet metal is placed on multiple workpiece clamps on the processing table. The position of the weld joint of the sheet metal is located by the joint detection sensor, and the sheet metal is fixed on the processing table by the workpiece clamps. Turn on the start switch on the ultrasonic generator to perform the shot blasting; after processing a preset position, move the workpiece fixing clamp and observe the horizontal scale, move the plate to the next preset position to perform the shot blasting until the shot blasting of the plate welding joint is completed.

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