Ultrasonic shot blasting device for friction stir welding

Abstract

The utility model discloses an ultrasonic shot peening device for friction stir welding. The ultrasonic shot peening device for friction stir welding comprises a needle shot gun body, the stirring head is arranged in the needle pill gun body in a penetrating mode in the axial direction, the stirring head can rotate in the needle pill gun body, a stirring needle is arranged at one end of the stirring head, and the stirring needle extends out of one end of the needle pill gun body; wherein one end of the needle shot gun body is provided with a plurality of shot peening needles, the plurality of shot peening needles are distributed around the stirring needle, and the shot peening needles are arranged at one end of the needle shot gun body in a telescopic vibration mode. According to the ultrasonic shot peening device for friction stir welding, ultrasonic shot peening treatment on the surfaces of all welding seams can be achieved, the effect of improving deformation of the welding seams is improved, the shot peening needle can act on the surfaces of all the welding seams especially when the welding seams at the corners of a two-dimensional track are welded, the structure is simple, and the application range is wide.

Description

Technical Field

[0001] The utility model relates to the technical field of welding, in particular to an ultrasonic shot peening device for friction stir welding. Background Art

[0002] Friction stir welding is a low-heat-input solid-phase welding method with the advantage of minimal welding deformation. For workpieces with densely distributed welds and weak rigidity, such as water-cooled plates, controllers, and battery trays, the welding deformation is still large after friction stir welding. Ultrasonic needle shot peening equipment utilizes an ultrasonic amplitude transformer and negative pressure suction to achieve flexible contact between the shot peening needle and the workpiece surface, causing the shot peening needle to vibrate and impact the weld surface, resulting in compressive stress on the weld surface and reducing welding deformation. Typically, multiple shot peening needles are grouped together after ultrasonic needle peening.

[0003] When the temperature of the welded workpiece is still high, ultrasonic needle peening has a more significant effect on improving weld deformation. This effect can be achieved by applying ultrasonic needle peening to the weld while welding.

[0004] In related technologies, the stirring head and ultrasonic shot peening needle are arranged in a front-to-back arrangement, with the stirring head in front and the ultrasonic shot peening needle at a certain distance behind to treat the weld. This method prevents the ultrasonic shot peening needle from affecting the entire weld surface when welding at a bend in a two-dimensional trajectory, which reduces the corrective effect. To reduce weld deformation in friction stir welding, methods such as applying anti-deformation to the tooling and pre-heating the back of the weld are used. However, these methods are relatively complex, and each anti-deformation measure is only applicable to products of one structure, resulting in narrow adaptability. Utility Model Content

[0005] The present invention aims to solve at least one of the technical problems existing in the prior art. To this end, the present invention provides an ultrasonic shot peening device for friction stir welding. The ultrasonic shot peening device for friction stir welding can achieve ultrasonic shot peening treatment on the entire weld surface, improving the effect of reducing weld deformation. In particular, when welding welds at bends in a two-dimensional trajectory, the shot peening needle can act on the entire weld surface. The device has a simple structure and a wide range of applications.

[0006] According to an embodiment of the present invention, an ultrasonic shot peening device for friction stir welding includes: a shot gun body; a stirring head, wherein the stirring head is axially inserted into the shot gun body, the stirring head is rotatable within the shot gun body, a stirring needle is provided at one end of the stirring head, and the stirring needle extends out of one end of the shot gun body; wherein a plurality of shot peening needles are provided at one end of the shot gun body, the plurality of shot peening needles are distributed around the stirring needle, and the shot peening needles are configured to be telescopically vibrating at one end of the shot gun body.

[0007] According to the ultrasonic shot peening device for stir friction welding of the embodiment of the present invention, a plurality of shot peening needles are arranged distributed around the stirring needle. While the stirring needle rotates forward at high speed to weld the workpiece, the plurality of shot peening needles around the stirring needle can perform continuous impact and vibration treatment on the weld surface, thereby achieving ultrasonic shot peening treatment on the entire weld surface, improving the effect of improving weld deformation, especially when welding welds at the bends of a two-dimensional trajectory, the shot peening needles can act on the entire weld surface, with a simple structure and a wide range of applications.

[0008] According to the ultrasonic shot peening device for stir friction welding in some embodiments of the present invention, the end face of one end of the stirring head protrudes axially from the end face of one end of the needle and shot gun body; wherein the height difference between the end face of one end of the stirring head and the end face of one end of the needle and shot gun body is less than or equal to the length of the shot peening needle extending relative to the end face of one end of the needle and shot gun body.

[0009] According to the ultrasonic shot peening device for friction stir welding in some embodiments of the present invention, the stirring head and the shot gun body are relatively fixed along the axial direction, and the axis of the stirring head coincides with the axis of the shot gun body.

[0010] According to the ultrasonic shot peening device for friction stir welding in some embodiments of the present invention, the shot peening needles are distributed in multiple layers at the end of the shot peening gun body; the multiple layers of shot peening needles are distributed at intervals along the radial direction of the shot peening gun body, and the number of shot peening needles in each layer is multiple and distributed at intervals along the circumference of the shot peening gun body.

[0011] According to the ultrasonic shot peening device for friction stir welding in some embodiments of the present invention, the plurality of shot peening needles in two adjacent layers are distributed opposite each other in a one-to-one correspondence in the radial direction of the shot peening gun body.

[0012] According to some embodiments of the ultrasonic shot peening device for stir friction welding of the present invention, the other end of the stirring head extends outside the other end of the needle shot gun body, and the other end of the stirring head is constructed as a clamping handle, which is used to drive the stirring head to rotate.

[0013] According to some embodiments of the ultrasonic shot peening device for stir friction welding of the present invention, the inner wall of the shot blasting gun body is gap-fitted with the outer peripheral wall of the stirring head; and / or a bearing is provided between the inner wall of the shot blasting gun body and the outer peripheral wall of the stirring head.

[0014] According to the ultrasonic shot peening device for friction stir welding in some embodiments of the present invention, the stirring needle is constructed in a truncated cone shape, and the outer diameter of the stirring needle gradually decreases in a direction away from the stirring head.

[0015] According to some embodiments of the ultrasonic shot peening device for friction stir welding of the present invention, the end surface of the shot peening needle extending outside the shot peening gun body is configured as a spherical surface, or the end of the shot peening needle extending outside the shot peening gun body is configured as a sphere with a flat end surface.

[0016] According to some embodiments of the ultrasonic shot peening device for friction stir welding of the present invention, a variable amplitude rod and a negative pressure structure are provided in the shot peening gun body, and the shot peening needle is suitable for telescopic vibration under the action of the variable amplitude rod and the negative pressure structure.

[0017] Additional aspects and advantages of the present invention will be given in part in the following description and will become apparent from the following description or learned through practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The above and / or additional aspects and advantages of the present invention will become apparent and readily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0019] Figure 1 This is a schematic diagram of the structure of the ultrasonic shot peening device for friction stir welding according to the embodiment of the present invention. Figure 1 ;

[0020] Figure 2 This is a schematic diagram of the structure of the ultrasonic shot peening device for friction stir welding according to the embodiment of the present invention. Figure 2 ;

[0021] Figure 3 It is a structural schematic diagram of a workpiece being welded by an ultrasonic shot peening device for friction stir welding according to an embodiment of the present invention.

[0022] Reference numerals:

[0023] Ultrasonic shot peening device 100 for friction stir welding,

[0024] Shot gun body 1, stirring head 2, clamping handle 21, stirring needle 3, shot peening needle 4, spherical surface 41, workpiece 5. DETAILED DESCRIPTION

[0025] The following describes embodiments of the present invention in detail. Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended only to explain the present invention and are not to be construed as limiting the present invention.

[0026] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention. In addition, features defined as "first" or "second" may explicitly or implicitly include one or more of such features. In the description of the present invention, unless otherwise specified, "multiple" means two or more.

[0027] In the description of this utility model, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integral connections; mechanical connections, electrical connections; direct connections, indirect connections through an intermediate medium, and internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in this utility model based on the specific circumstances.

[0028] Reference below Figure 1-Figure 3 An ultrasonic shot peening device 100 for friction stir welding according to an embodiment of the present invention is described. The ultrasonic shot peening device 100 for friction stir welding can realize ultrasonic shot peening treatment on the entire weld surface, thereby improving the effect of improving weld deformation. Especially when welding welds at the bends of a two-dimensional trajectory, the shot peening needle 4 can act on the entire weld surface. It has a simple structure and a wide range of applications.

[0029] like Figure 1-Figure 3 As shown, an ultrasonic shot peening device 100 for friction stir welding according to an embodiment of the present invention includes a shot peening gun body 1 and a stirring head 2 .

[0030] The shot gun body 1 is the main structure of the whole device, and its interior is a cavity to form an installation space for installing the stirring head 2 and the shot peening needle 4, ensuring the normal operation of the stirring head 2 and the shot peening needle 4. The shot gun body 1 can be constructed in a cylindrical, square or other shape, and can be flexibly set according to actual needs. Figure 1-3 As shown in the accompanying drawings, a cylindrical needle pill gun body 1 is used as an example for description.

[0031] The stirring head 2 is axially penetrated in the needle-pellet gun body 1 and is rotatable in the needle-pellet gun body 1 . A stirring needle 3 is provided at one end of the stirring head 2 and extends out of one end of the needle-pellet gun body 1 .

[0032] Specifically, refer to the attached Figure 1 and attached Figure 3 As shown, the stirring head 2 is also constructed in a cylindrical shape. The stirring head 2 is axially inserted into the needle-shot gun body 1 from top to bottom, that is, the two are coaxially distributed, and the stirring head 2 can rotate in the needle-shot gun body 1, that is, the stirring head 2 can rotate relative to the needle-shot gun body 1 along the central axis of the needle-shot gun body 1, wherein a stirring needle 3 is provided at one end of the stirring head 2 close to the workpiece 5 to be welded, and the stirring needle 3 extends to the outside of the end of the needle-shot gun body 1 close to the workpiece 5 to be welded so as to directly contact the workpiece 5.

[0033] In this way, as attached Figure 3 As shown, when the workpiece 5 is actually welded, the lower end of the stirring needle 3 can be inserted into the interior of the workpiece 5, and the stirring head 2 can drive the stirring needle 3 to rotate at a high speed when rotating at a high speed, so that the stirring needle 3 can be moved along the seam direction of the workpiece 5 while rotating at a high speed, thereby realizing friction stir welding. Figure 3 The welding direction shown in the example is from left to right.

[0034] Furthermore, a plurality of shot blasting needles 4 are provided at one end of the shot blasting gun body 1 , the plurality of shot blasting needles 4 are distributed around the stirring needle 3 , and the shot blasting needles 4 are configured to be telescopically vibrating at one end of the shot blasting gun body 1 .

[0035] Specifically, the shot peening needle 4 is used to perform ultrasonic shot peening on the weld surface after friction stir welding. Since the weld deformation after friction stir welding is still large, the continuous vibration and impact of the shot peening needle 4 on the weld surface can reduce the weld deformation and improve the welding effect.

[0036] A shot peening needle 4 can be set at one end of the shot gun body 1 close to the workpiece 5 to be welded, so that the shot peening needle 4 can contact the surface of the workpiece 5 to be welded. The number of shot peening needles 4 can be set to two, three or even more. By setting up multiple shot peening needles 4, the weld surface can be ultrasonically shot peened at multiple positions to improve the shot peening effect.

[0037] The shot peening needle 4 is configured to be telescopically vibrating at one end of the shot peening gun body 1, that is, the shot peening needle 4 can be extended to the outside of the end of the shot peening gun body 1 close to the workpiece 5 to be welded, so as to impact the surface of the workpiece 5, and then retract into the shot peening gun body 1, so as to perform reciprocating telescopic vibration to achieve continuous impact on the surface of the workpiece 5, and shot peen the surface of the workpiece 5 in a high-frequency vibration manner, thereby improving the shot peening efficiency and effect.

[0038] Reference Attachment Figure 2As shown, multiple shot peening needles 4 can be evenly or unevenly distributed around the stirring needle 3 to form an all-round shot peening area. While the stirring needle 3 rotates at high speed for welding, the shot peening needle 4 can perform continuous impact vibration treatment on the weld surface around the stirring needle 3, thereby realizing ultrasonic shot peening treatment of the entire weld surface, improving the effect of improving weld deformation, especially when welding welds at the bends of a two-dimensional trajectory, the shot peening needle 4 can act on the entire weld surface.

[0039] According to the ultrasonic shot peening device 100 for stir friction welding of the embodiment of the present invention, a plurality of shot peening needles 4 are arranged distributed around the stirring needle 3, so that while the stirring needle 3 rotates forward at high speed to weld the workpiece 5, the plurality of shot peening needles 4 around the stirring needle 3 can perform continuous impact and vibration treatment on the weld surface, thereby achieving ultrasonic shot peening treatment on the entire weld surface, improving the effect of improving weld deformation, especially when welding welds at the bends of a two-dimensional trajectory, the shot peening needles 4 can act on the entire weld surface, with a simple structure and a wide range of applications.

[0040] In some embodiments, an end surface of one end of the stirring head 2 protrudes axially from an end surface of one end of the needle and pill gun body 1 .

[0041] Specifically, if Figure 1 As shown in the upper and lower directions, the end surface of the lower end of the stirring head 2 protrudes axially from the end surface of the lower end of the needle gun body 1. In this way, when the stirring needle 3 penetrates into the workpiece 5 to be welded and rotates continuously at high speed, Figure 3 As shown, the end face of the lower end of the stirring head 2 presses against the surface of the workpiece 5 and generates heat by friction to prevent the plastic material from overflowing. At the same time, since the end face of the lower end of the shot blasting gun body 1 is higher than the end face of the lower end of the stirring head 2, that is, there is a certain distance between the end face of the lower end of the shot blasting gun body 1 and the surface of the workpiece 5, the shot blasting needle 4 can extend out of the end face of the lower end of the shot blasting gun body 1 and act on the surface of the workpiece 5, and continuously vibrate up and down within this distance to act on the surface of the workpiece 5 to perform post-weld treatment on the weld.

[0042] The height difference between the end surface of one end of the stirring head 2 and the end surface of one end of the shot gun body 1 is less than or equal to the length of the shot blasting needle 4 extending relative to the end surface of one end of the shot gun body 1 .

[0043] That is to say, the distance between the end face of the lower end of the stirring head 2 and the end face of the lower end of the needle shot gun body 1, that is, the height difference, must be less than or equal to the length of the shot peening needle 4 extending relative to the end face of the lower end of the needle shot gun body 1, thereby ensuring that the shot peening needle 4 can fully act on the surface of the workpiece 5 to ensure the treatment effect on the weld.

[0044] In actual design, for example, the height difference between the end face of the lower end of the stirring head 2 and the end face of the lower end of the needle and shot gun body 1 can be set to 0 to 30 mm, for example, 0 mm, 5 mm, 7 mm, 10 mm, 13 mm, 20 mm, 25 mm, 30 mm, etc., and the shot peening needle 4 can vibrate up and down within this range. It can be understood that the smaller the height difference between the end face of the lower end of the stirring head 2 and the end face of the lower end of the needle and shot gun body 1, the smaller the length of the shot peening needle 4 extending relative to the end face of the lower end of the needle and shot gun body 1, and the greater the height difference between the end face of the lower end of the stirring head 2 and the end face of the lower end of the needle and shot gun body 1, the greater the length of the shot peening needle 4 extending relative to the end face of the lower end of the needle and shot gun body 1. The height difference can be flexibly selected according to actual working conditions and needs.

[0045] In some embodiments, the stirring head 2 and the needle pill gun body 1 are relatively fixed in the axial direction, that is, the stirring head 2 and the needle pill gun body 1 remain relatively stationary in the length direction, the stirring head 2 will not move relative to this direction, and the axis of the stirring head 2 coincides with the axis of the needle pill gun body 1, that is, when the stirring head 2 and the needle pill gun body 1 rotate or move, the center lines of the two remain consistent.

[0046] In this way, the stability and accuracy of the ultrasonic shot peening device 100 for stir friction welding during welding can be guaranteed, the treatment effect of weld deformation can be guaranteed, and the axial movement between the stirring head 2 and the needle shot gun body 1, which causes the plastic metal of the weld to migrate axially in the stirring needle 3, thereby causing uneven distribution of weld metal and changes in the cross-sectional area of ​​the weld core, affecting the quality and appearance of the weld. In addition, when the axial movement between the stirring head 2 and the needle shot gun body 1 is too large, the stirring head 2 may also be broken.

[0047] In some embodiments, the shot peening needles 4 are distributed in multiple layers at the end of the shot peening gun body 1 , that is, the shot peening needles 4 can be distributed in multiple columns and rows at the end of the shot peening gun body 1 , thereby increasing the effective area of ​​the shot peening needles 4 and enhancing the ultrasonic shot peening effect.

[0048] The multi-layer shot peening needles 4 are distributed at intervals along the radial direction of the shot peening gun body 1, that is, the multi-layer shot peening needles 4 extend outward from the center of the shot peening gun body 1 and are distributed at intervals. In this way, it is ensured that the shot peening needles 4 can form uniform and dense impact points when impacting the surface of the workpiece 5, thereby improving the uniformity and efficiency of the shot peening process.

[0049] There are multiple shot peening needles 4 in each layer and they are distributed at intervals along the circumference of the shot peening gun body 1, that is, there are multiple shot peening needles 4 in each layer, and the multiple shot peening needles 4 are distributed at intervals around the circumference of the stirring needle 3. In this way, the shot peening needles 4 can fully cover the welding heat affected zone of the workpiece 5, avoid the blind spot of the treatment, and ensure the comprehensiveness of the shot peening treatment. Even when processing the weld at the corner of the two-dimensional trajectory, the shot peening needles 4 can fully act on the entire weld surface, greatly improving the effect of improving the weld deformation.

[0050] Specifically, if Figure 2 As shown, the shot peening needles 4 are distributed in two layers at the end of the shot peening gun body 1. The two layers of shot peening needles 4 are distributed at intervals along the radial direction of the shot peening gun body 1. There are multiple shot peening needles 4 in each layer and they are distributed at intervals along the circumference of the shot peening gun body 1. The number of shot peening needles 4 in the two layers is the same. Figure 2 In the figure, 18 shot peening needles per layer are used as an example for explanation. The first layer, i.e., the shot peening needles 4 close to the center of the shot peening gun body 1, are densely distributed, while the shot peening needles 4 far from the center of the shot peening gun body 1 are sparsely distributed. Of course, other layers and quantities can also be set, which can be flexibly set according to actual needs. The range of action of the shot peening needles 4 can cover the heat affected zone of the welding.

[0051] In some embodiments, the plurality of shot peening needles 4 in two adjacent layers are distributed opposite each other in a one-to-one correspondence in the radial direction of the shot peening gun body 1 .

[0052] That is, the shot peening needles 4 of each layer are directly aligned with the shot peening needles 4 at corresponding positions in the next layer, thereby forming an "array" or "grid" layout.

[0053] In this way, it can be ensured that the welding heat affected zone of the workpiece 5 is evenly and comprehensively covered, so that the welds can be fully shot peened, improving the treatment quality of the welds, and the positive distribution can also achieve more efficient energy transfer and impact effect, that is, when the upper layer of shot peening needles 4 hit the surface of the workpiece 5, the lower layer of shot peening needles 4 can serve as "support" or "auxiliary" points to help better disperse and transfer the impact energy, thereby improving the efficiency of shot peening and improving the treatment effect of weld deformation.

[0054] In the actual design, the center lines of the multiple shot peening needles 4 in each layer are located on a circle of the same diameter, that is, the multiple layers of shot peening needles 4 are located on multiple circles of different diameters. The diameter of the circle on which the center lines of the multiple shot peening needles 4 in the outermost layer of the multiple layers of shot peening needles 4 lie is greater than 1.5 times the diameter of the end face of the lower end of the mixing head 2. At the same time, the multiple shot peening needles 4 in the innermost layer are spaced apart from the outer peripheral wall of the mixing head 2. This increases the effective area of ​​the shot peening needles 4 to ensure the ultrasonic shot peening effect. The effective range of the multiple shot peening needles 4 can cover the heat-affected zone of the weld, thereby ensuring the corrective effect on the weld.

[0055] Specifically, if Figure 1 As shown, the shot peening needles 4 are two layers, wherein the diameter of the circle where the center lines of the multiple shot peening needles 4 located in the outermost layer are located is D2, and the end face diameter of the lower end of the stirring head 2 is D1, and satisfies: D2 / D1>1.5, such as being set to be greater than 1.6, 1.7, 1.8, or other ratios.

[0056] In some embodiments, the other end of the stirring head 2 extends out of the other end of the needle and pill gun body 1 , and the other end of the stirring head 2 is configured as a clamping handle 21 , which is used to drive the stirring head 2 to rotate.

[0057] Specifically, if Figure 1 As shown in the upper and lower directions, the upper end of the stirring head 2 extends outside the upper end of the needle gun body 1, and the upper end of the stirring head 2 is constructed as a clamping handle 21. The clamping handle 21 is mainly used to clamp and transmit power to the stirring head 2. The clamping handle 21 can be driven to rotate by a driving device, and the rotation of the clamping handle 21 drives the stirring head 2 to rotate, thereby ensuring that the stirring head 2 can stably transmit power during the welding process and ensure stable welding.

[0058] The clamping handle 21 can also be used to accurately control key welding parameters such as the feed speed and rotation speed of the stirring head 2, thereby improving the quality of the weld.

[0059] In some embodiments, the inner wall of the needle and pellet gun body 1 and the outer peripheral wall of the stirring head 2 are loosely matched.

[0060] That is, there is a certain gap between the inner peripheral wall of the needle and pellet gun body 1 and the outer peripheral wall of the stirring head 2, and there is a certain degree of freedom when the two move relative to each other.

[0061] In this way, the friction of the stirring head 2 when it moves in the needle-shot gun body 1 can be reduced, the wear and energy consumption of the stirring head 2 can be reduced, and the stirring head 2 can move more flexibly in the needle-shot gun body 1, thereby ensuring the smooth progress of the welding process and improving the welding quality.

[0062] In other embodiments, a bearing is provided between the inner wall of the pellet gun body 1 and the outer peripheral wall of the stirring head 2 .

[0063] That is, a bearing is provided on the outer periphery of the stirring head 2, which can support the stirring head 2 and enable the stirring head 2 to rotate smoothly in the needle-shot gun body 1 through the relative movement between the bearing and the stirring head 2, thereby ensuring the stability and accuracy of the movement of the stirring head 2. At the same time, the bearing can avoid friction between the stirring head 2 and the needle-shot gun body 1, reduce the wear of the stirring head 2, and thus extend the service life of the stirring head 2.

[0064] In actual design, the bearing parts can be set as sliding bearings, rolling bearings, etc., and can be flexibly selected according to actual conditions.

[0065] In some embodiments, the stirring needle 3 is configured in a truncated cone shape, and the outer diameter of the stirring needle 3 gradually decreases in a direction away from the stirring head 2 .

[0066] Specifically, if Figure 1 and Figure 3As shown, the middle position of the lower end surface of the stirring head 2 protrudes downward and extends a distance to form a truncated cone-shaped stirring needle 3. This is conducive to forming a gradually increasing shear force when the stirring needle 3 penetrates into the interior of the workpiece 5 and performs welding, thereby better dispersing and mixing the materials, thereby improving the welding quality.

[0067] The outer diameter of the stirring needle 3 gradually decreases in the direction away from the stirring head 2, that is, the outer diameter of the stirring needle 3 gradually decreases from top to bottom. In this way, the forward resistance of the stirring needle 3 in the workpiece 5 material can be reduced and the stirring efficiency can be improved.

[0068] In some embodiments, the end surface of the shot peening needle 4 extending outside the shot peening gun body 1 is configured as a spherical surface 41 ; the material is a relatively hard material, including but not limited to tungsten steel, high-speed steel, mold steel, etc.

[0069] Specifically, if Figure 1 and Figure 3 As shown, the lower end face of the shot peening needle 4 is constructed as a spherical surface 41. The spherical surface 41 acts on the surface of the workpiece 5, which can make the shot peening needle 4 evenly distribute force when hitting the workpiece surface, reduce local stress concentration, thereby improving the effect of shot peening strengthening and reducing damage to the surface of the workpiece 5.

[0070] In addition, the end surface of the spherical surface 41 can better adapt to the surface of the workpiece 5 of different shapes and angles, thereby ensuring the uniformity and consistency of the shot peening treatment and improving the effect of improving weld deformation.

[0071] In some embodiments, the side of the shot peening needle 4 close to the workpiece is a flat sphere; the material is a relatively hard material, including but not limited to tungsten steel, high-speed steel, mold steel, etc.

[0072] In some embodiments, a variable amplitude rod and a negative pressure structure are provided in the shot blasting gun body 1, and the shot blasting needle 4 is adapted to telescopically vibrate under the action of the variable amplitude rod and the negative pressure structure.

[0073] That is to say, a variable amplitude rod and a negative pressure structure are provided above the shot peening needle 4. The negative pressure structure can use its negative pressure suction force to make the end of the shot peening needle 4 away from the surface of the workpiece 5 be adsorbed on the end face of the variable amplitude rod. The variable amplitude rod can amplify the mechanical vibration converted by the transducer electrical signal and act on the shot peening needle 4 to realize the up and down telescopic vibration of the shot peening needle 4.

[0074] Throughout this specification, reference to terms such as "one embodiment," "some embodiments," "illustrative embodiments," "examples," "specific examples," or "some examples" means that the specific features, structures, materials, or characteristics described in conjunction with that embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the illustrative use of the above terms does 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 any one or more embodiments or examples.

[0075] Although the embodiments of the present invention have been shown and described, those skilled in the art will appreciate that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and purpose of the present invention, and that the scope of the present invention is defined by the claims and their equivalents.

Claims

1. An ultrasonic shot peening device for friction stir welding, characterized in that: include: Needle gun body; A stirring head, the stirring head is axially inserted into the needle-shot gun body, the stirring head is rotatable within the needle-shot gun body, one end of the stirring head is provided with a stirring needle, the stirring needle extends out of one end of the needle-shot gun body; Wherein, a plurality of shot blasting needles are provided at one end of the shot blasting gun body, the plurality of shot blasting needles are distributed around the stirring needle, and the shot blasting needles are configured to be telescopically vibrating at one end of the shot blasting gun body.

2. The ultrasonic shot peening device for friction stir welding according to claim 1, characterized in that: An end surface of one end of the stirring head protrudes axially from an end surface of one end of the needle and pill gun body; The height difference between the end surface of one end of the stirring head and the end surface of one end of the shot gun body is less than or equal to the length of the shot blasting needle extending relative to the end surface of one end of the shot gun body.

3. The ultrasonic shot peening device for friction stir welding according to claim 1, characterized in that: The stirring head and the needle-shot gun body are relatively fixed along the axial direction, and the axis of the stirring head coincides with the axis of the needle-shot gun body.

4. The ultrasonic shot peening device for friction stir welding according to claim 1, characterized in that: The shot blasting needles are distributed in multiple layers at the end of the shot blasting gun body; The multiple layers of shot blasting needles are distributed at intervals along the radial direction of the shot blasting gun body. The number of shot blasting needles in each layer is multiple and the shot blasting needles are distributed at intervals along the circumference of the shot blasting gun body.

5. The ultrasonic shot peening device for friction stir welding according to claim 4, characterized in that: The plurality of shot blasting needles in two adjacent layers are distributed opposite each other in a one-to-one correspondence in the radial direction of the shot blasting gun body.

6. The ultrasonic shot peening device for friction stir welding according to claim 1, characterized in that: The other end of the stirring head extends out of the other end of the needle and pill gun body, and the other end of the stirring head is configured as a clamping handle, and the clamping handle is used to drive the stirring head to rotate.

7. The ultrasonic shot peening device for friction stir welding according to claim 1, characterized in that: The inner wall of the needle gun body is in clearance with the outer peripheral wall of the stirring head; And / or, a bearing is provided between the inner wall of the needle and pellet gun body and the outer peripheral wall of the stirring head.

8. The ultrasonic shot peening device for friction stir welding according to claim 1, characterized in that: The stirring needle is configured in a truncated cone shape, and an outer diameter of the stirring needle gradually decreases in a direction away from the stirring head.

9. The ultrasonic shot peening device for friction stir welding according to claim 1, characterized in that: The end surface of the shot blasting needle extending out of the shot blasting gun body is configured as a spherical surface, or the end of the shot blasting needle extending out of the shot blasting gun body is configured as a sphere with a flat end surface.

10. The ultrasonic shot peening device for friction stir welding according to claim 1, characterized in that: The shot blasting gun body is provided with an amplitude changing rod and a negative pressure structure, and the shot blasting needle is suitable for stretching and vibrating under the action of the amplitude changing rod and the negative pressure structure.

Images