Tool head for strengthening hole edge chamfer and hole edge chamfer strengthening equipment

Abstract

The invention discloses a tool head for strengthening a hole edge chamfer and hole edge chamfer strengthening equipment, the tool head comprises a pressure head main body which is arranged to be connected with an ultrasonic vibration device so as to vibrate and rotate around a center line under the driving of the ultrasonic vibration device, and the pressure head main body is provided with a first end and a second end in the direction of the center line; the hammering parts are arranged on the same circumference at intervals in the circumferential direction around the center line of the pressing head main body; wherein each hammering portion is provided with a hammering face used for making contact with a hole edge chamfer of a hole to be strengthened, the hammering faces are arranged to incline outwards in the radial direction in the direction from the first end to the second end, and when the tool head is arranged in the mode that the center line is consistent with the center of the hole to be strengthened, the hammering faces are parallel to the hole edge chamfer of the hole to be strengthened. According to the scheme provided by the embodiment of the invention, the hole edge chamfer can be strengthened, residual stress is introduced, and the fatigue performance of the bearing hole is effectively improved.

Description

Technical Field

[0001] The present invention relates to the technical field of parts processing, and in particular to a tool head for strengthening hole edge chamfering and a hole edge chamfering strengthening device. Background Art

[0002] In the field of aerospace, a large number of parts are assembled through bearing holes, which play important roles such as connection and force transmission. Some key parts are subjected to a large number of alternating loads during operation. At the same time, due to the geometric structure of the holes, stress concentration is prone to occur, which eventually leads to fatigue failure of the bearing holes. According to statistics, fatigue failure of hole structures accounts for more than 50% of all aircraft structural parts. Therefore, improving the fatigue performance of bearing holes is of great significance to ensuring aerospace safety.

[0003] The fatigue failure of load-bearing holes mostly originates from the surface, and the surface strengthening process is considered to be a typical and effective anti-fatigue manufacturing method. For the surface strengthening technology of hole structures, the current mainstream methods are mainly rolling strengthening and extrusion strengthening. Extrusion strengthening and rolling strengthening are both methods for strengthening the hole wall. The fatigue performance of the load-bearing holes is improved after extrusion and rolling, but fatigue cracks are prone to occur at the edge of the hole (that is, the edge of the hole mouth). Generally, the load-bearing holes are chamfered at the edge of the hole, which can not only remove the burrs on the edge of the hole, which is conducive to the assembly of components, but also the chamfering of the hole edge is conducive to more uniform stress distribution.

[0004] In order to avoid fatigue cracks at the hole edge, the hole edge chamfer needs to be strengthened to further improve the fatigue life of the hole structure. Summary of the invention

[0005] The embodiments of the present application provide a tool head and a hole edge chamfer strengthening device for strengthening the hole edge chamfer to solve the problem of fatigue cracks easily occurring at the hole edge of the load-bearing hole in the prior art.

[0006] An embodiment of the present application provides a tool head for strengthening the chamfering of a hole edge, comprising: A pressure head body, arranged to be connected to the ultrasonic vibration device so as to vibrate and rotate around a center line under the drive of the ultrasonic vibration device, and the pressure head body has a first end and a second end in the direction of the center line; A plurality of hammering parts are arranged at intervals in the circumferential direction on the same circumference around the center line of the pressure head body; Wherein, each of the hammering parts has a hammering surface for contacting the chamfer of the hole edge to be strengthened, and the hammering surface is arranged to be radially inclined outward from the first end toward the second end, so that when the tool head is set so that the center line is consistent with the center of the hole to be strengthened, the hammering surface is parallel to the chamfer of the hole edge to be strengthened.

[0007] In one embodiment, the hammering surface is an arcuate surface on the radial outside of the hammering portion.

[0008] In one embodiment, the pressure head body includes a conical structure, and the hammer portion protrudes from a conical surface of the conical structure.

[0009] In one embodiment, the hammering portion is a roller mounted on the conical structure, the roller is rotatable relative to the conical structure, and the outer peripheral surface of the roller is the hammering surface.

[0010] In one embodiment, the pressure head body includes an inner core and a conical sleeve with the conical surface which is sleeved on the outside of the inner core. The inner core and the conical sleeve are assembled to form a conical structure. The conical sleeve is circumferentially provided with a plurality of openings corresponding to the rollers respectively, and the roller part protrudes from the opening.

[0011] In one embodiment, the tapered sleeve and the inner core cooperate to form a limiting space for limiting the position of the roller, and the roller is rotatable in the limiting space; The roller has a consistent cross-section in the length direction, the opening is a square hole, the width of the opening of the square hole toward the outer end in the radial direction of the roller is smaller than the outer diameter of the roller, and the width of the opening of the directional hole toward the inner end is larger than the outer diameter of the roller.

[0012] In one embodiment, the inner core is a conical platform, and when the outer side of the roller abuts against the chamfer of the hole edge and rolls, the inner side abuts against the conical surface of the conical platform.

[0013] In one embodiment, the conical sleeve is fixed to the conical platform by a plurality of bolts, and the plurality of bolts are arranged at intervals along the circumference of the conical sleeve; Alternatively, the inner surface of the tapered sleeve is provided with an internal thread, the outer surface of the tapered platform is provided with an external thread, and the tapered sleeve is connected to the tapered platform via threads.

[0014] In one embodiment, the hammering portion is fixedly connected to the conical surface of the conical structure, or the hammering portion and the conical structure are integrally formed.

[0015] In one embodiment, a connecting rod for connecting to the ultrasonic vibration device is further included, and the connecting rod is connected to the first end of the pressure head body, or connected to the second end of the pressure head body.

[0016] An embodiment of the present application also provides a hole edge chamfer strengthening device, comprising an ultrasonic vibration device and a tool head as described above, wherein the tool head is connected to the ultrasonic vibration device; wherein the ultrasonic vibration device is configured to drive the tool head to vibrate and rotate.

[0017] When the tool head provided in the embodiment of the present application is against the opening of one end of the hole to be strengthened, the hammering surfaces of the multiple hammering parts are against the chamfer of the hole edge. When the tool head provided in the embodiment of the present application is driven by the ultrasonic vibration device to vibrate at high frequency and rotate, the multiple hammering parts impact the chamfer of the hole edge during the rotation process, which can strengthen the chamfer of the hole edge and introduce residual stress. The residual compressive stress can offset the harmful residual tensile stress of the load-bearing hole edge, thereby inhibiting the initiation and expansion of cracks, thereby effectively improving the fatigue performance of the load-bearing hole. The tool head provided in the present application is used to strengthen the chamfer of the hole edge, which has the advantages of good vibration transmission, high efficiency, good versatility and flexibility.

[0018] Other features and advantages of the present application will be described in the following description, and partly become apparent from the description, or be understood by implementing the present application. Other advantages of the present application can be realized and obtained by the schemes described in the description and the drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The accompanying drawings are used to provide an understanding of the technical solution of the present application and constitute a part of the specification. Together with the embodiments of the present application, they are used to explain the technical solution of the present application and do not constitute a limitation on the technical solution of the present application.

[0020] Figure 1 is a schematic structural diagram of a tool head according to an embodiment of the present application; Figure 2 for Figure 1 The tool head shown is a schematic diagram of the structure in a disassembled state; Figure 3 It is a schematic diagram of a partially cutaway structure of a tool head according to one embodiment of the present application; Figure 4 is a schematic diagram of an inner core portion and a tapered sleeve of a tool head in a disassembled state according to an embodiment of the present application; Figure 5 A schematic diagram of the structure of a tool head according to an embodiment of the present application (connecting rod is not shown) Figure 6 A schematic diagram of using a tool head in one embodiment of the present application to hammer and chamfer a hole edge; Figure 7 A schematic diagram of using a tool head in another embodiment of the present application to hammer and chamfer a hole edge; Figure 8 A schematic diagram of using a tool head in another embodiment of the present application to hammer and chamfer a hole edge; Fig. 9 It is a schematic diagram of using a tool head in another embodiment of the present application to hammer chamfer a hole edge.

[0021] Description of reference numerals: 1-pressing head body; 11-inner core; 111-threaded hole; 12-conical sleeve; 121-opening; 2-hammering part; 3-connecting rod; 4-locking nut; 5-bolt; 100-first workpiece; 101-first opening; 200-second workpiece; 201-second opening. DETAILED DESCRIPTION

[0022] The present application describes multiple embodiments, but the description is exemplary rather than restrictive, and it is obvious to those skilled in the art that there may be more embodiments and implementations within the scope of the embodiments described in the present application. Although many possible feature combinations are shown in the drawings and discussed in the specific embodiments, many other combinations of the disclosed features are also possible. Unless specifically limited, any feature or element of any embodiment may be used in combination with any other feature or element in any other embodiment, or may replace any other feature or element in any other embodiment.

[0023] The present application includes and contemplates combinations of features and elements known to those of ordinary skill in the art. The embodiments, features and elements disclosed in the present application may also be combined with any conventional features or elements to form a unique invention scheme. Any features or elements of any embodiment may also be combined with features or elements from other invention schemes to form another unique invention scheme. Therefore, it should be understood that any feature shown and / or discussed in the present application may be implemented individually or in any appropriate combination. Therefore, except for the limitations made according to the attached claims and their equivalents, the embodiments are not subject to other restrictions. In addition, various modifications and changes may be made within the scope of protection of the attached claims.

[0024] In addition, when describing representative embodiments, the specification may have presented the method and / or process as a specific sequence of steps. However, to the extent that the method or process does not rely on the specific order of the steps described herein, the method or process should not be limited to the steps of the specific order described. As will be understood by those of ordinary skill in the art, other sequences of steps are also possible. Therefore, the specific sequence of the steps set forth in the specification should not be interpreted as a limitation to the claims. In addition, the claims for the method and / or process should not be limited to the steps of performing them in the order written, and those skilled in the art can easily understand that these sequences can be changed and still remain within the spirit and scope of the embodiments of the present application.

[0025] The embodiment of the present application provides a tool head for strengthening the chamfering of hole edges, such as Figure 1-Figure 5 Tool heads shown include: The pressure head body 1 is configured to be connected to the ultrasonic vibration device so as to vibrate and rotate around the center line under the drive of the ultrasonic vibration device, and the pressure head body 1 has a first end and a second end in the direction of the center line; A plurality of hammering parts 2 are arranged at intervals in the circumferential direction on the same circumference around the center line of the pressure head body 1; Each hammering part 2 has a hammering surface for contacting the chamfer of the hole to be strengthened, and the hammering surface is arranged to be inclined radially outward from the first end toward the second end of the ram body 1, so that when the center line of the tool head is arranged to coincide with the center of the hole to be strengthened, the hammering surface is parallel to the chamfer of the hole to be strengthened. In other words, the inclination angle of the hammering surface relative to the center line of the ram body 1 is the same as the inclination angle of the chamfer of the hole to be strengthened.

[0026] When the tool head provided in the embodiment of the present application is against the opening of one end of the hole to be strengthened, the hammering surfaces of the multiple hammering parts 2 are against the chamfer of the hole edge. When the tool head provided in the embodiment of the present application is against the opening of one end of the hole to be strengthened, the hammering surfaces of the multiple hammering parts 2 are against the chamfer of the hole edge. When the tool head provided in the present application is driven by the ultrasonic vibration device to vibrate at a high frequency and rotate, the multiple hammering parts 2 hammer the chamfer of the hole edge and roll the chamfer of the hole edge during the rotation process, so as to strengthen the chamfer of the hole edge and introduce residual stress. The residual compressive stress can offset the harmful residual tensile stress of the load-bearing hole edge, thereby inhibiting the initiation and expansion of cracks, thereby effectively improving the fatigue performance of the load-bearing hole. The tool head provided in the present application is used to strengthen the chamfer of the hole edge, which has the advantages of good vibration transmission, high efficiency, good versatility and flexibility.

[0027] In one embodiment, the hammering surface is an arcuate surface on the radially outer side of the hammering portion 2, because the arcuate surface is more likely to cause the hole edge chamfer to undergo plastic deformation when hammering than the plane surface, thereby more effectively strengthening the hole edge chamfer and more effectively improving fatigue performance. The arcuate surface may be a cylindrical surface or a curved surface of other shapes.

[0028] In one embodiment, Figure 1-Figure 5 As shown, the ram body 1 includes a conical structure, and the hammering portion 2 protrudes from the conical surface of the conical structure. By installing the hammering portion 2 on the conical structure, the hammering surface of the conical portion 2 for hammering the chamfer of the hole edge can be radially tilted outward from the first end toward the second end.

[0029] It is understandable that the hammer part 2 is not limited to being set on the conical structure of the ram body 1. For example, the hammer part 2 can be installed on the columnar structure of the ram body 1, and the outer side of the hammer part 2 facing away from the ram body 1 has a radially inclined surface.

[0030] In one embodiment, the hammering part 2 is a roller mounted on a conical structure, the roller is rotatable relative to the conical structure, and the outer peripheral surface of the roller is a hammering surface. When the hammering part 2 is set as a roller, when the hammering part 2 abuts against the chamfer of the hole edge and rotates around the center line, the roller rolls the chamfer of the hole edge by rotating. The method of using a roller to roll the chamfer of the hole edge can facilitate the tool head to rotate more smoothly, and the roller can be set to a larger radius, and the contact area with the chamfer of the hole edge is large, which is conducive to improving the processing efficiency. At the same time, the roller rolls the surface, and the surface processing effect is good.

[0031] In addition, due to the rotational installation of the roller and the pressure head body 1, a certain installation space is required, so the size of the circumference of the hammering surface of the roller will not be too small. Therefore, the tool head using the roller is suitable for processing the chamfering of the hole edges of larger holes. It can process the chamfering of the hole edges of holes with a minimum hole diameter of Φ18, and there is no limit on the maximum hole diameter.

[0032] In one embodiment, the pressure head body 1 includes an inner core portion 11 and a tapered sleeve 12 with a tapered surface which is sleeved on the outer side of the inner core portion 11. The tapered sleeve 12 is provided with a plurality of openings 121 corresponding to the rollers at intervals along the circumferential direction. Each roller partially protrudes from the opening 121, and the surface of the portion of the roller protruding from the opening 121 contacts the chamfer of the hole edge.

[0033] In one example, if Figure 2-Figure 4 As shown, the tapered sleeve 12 and the inner core 11 cooperate to form a limiting space for limiting the position of the roller, and the roller can rotate freely in the limiting space.

[0034] In one example, to prevent the roller from slipping out of the opening 121, the roller is a column with a uniform cross section in the length direction, such as a cylinder, and the opening 121 is a square hole, the width of the opening of the square hole toward the outside in the radial direction of the roller is smaller than the outer diameter of the roller, and the width of the opening of the directional hole toward the inside is larger than the outer diameter of the roller. In this way, the roller can be installed in the opening 121 from the inside of the tapered sleeve 12, and cannot slip out of the opening 121 to the outside of the tapered sleeve 12, and the length of the opening 121 can be set to be slightly larger than the length of the roller.

[0035] In one example, the inner core 11 is a conical table, and when the outer side of the roller rolls against the chamfer of the hole edge, the inner side of the roller rolls against the conical surface of the conical table. The size of the conical table at the location where the roller is installed and the size of the roller are determined according to the size of the chamfer of the hole edge. In this example, the space in the opening 121 is the limiting space of the roller.

[0036] The thickness of the tapered sleeve 12 is determined according to the diameter of the roller, and the thickness of the tapered sleeve 12 determines the depth of the opening 121, which accommodates the part of the roller with the largest diameter. In order to allow the roller to rotate between the tapered sleeve 12 and the inner core 11, the sum of the thickness of the tapered sleeve 12 and the dimension of the roller extending out of the opening 121 is greater than the diameter of the roller, so that the rolling clearance between the roller and the inner core 11 can be guaranteed.

[0037] It is understandable that a groove for accommodating the roller can also be provided on the outer surface of the conical table, that is, the groove of the conical table and the opening 121 of the conical sleeve 12 together form a limiting space for the limiting roller. In this case, the thickness of the conical sleeve 12 can be reduced.

[0038] It can also be understood that the roller is not limited to the installation method of limiting the position of the tapered sleeve 12 and the inner core 11. For example, the roller can also be installed on the pressure head body 1 through a rotating shaft.

[0039] exist Figure 1-Figure 3 In the example, the tapered angle of the tapered sleeve 12 is the same as the angle of the chamfer of the hole edge, and the roller is a cylinder with a consistent cross-section along the length direction. In other embodiments, the tapered angle of the tapered sleeve 12 can also be different from the angle of the chamfer of the hole edge. In this case, the roller can be set to a frustum structure. By matching the tapered angle of the roller with the tapered angle of the tapered sleeve 12, the inclination angle of the outer surface of the roller in contact with the chamfer of the hole edge relative to the center line of the pressure head body 1 can also be consistent with the angle of the chamfer of the hole edge.

[0040] exist Figure 1-Figure 3 In the example of , the conical sleeve 12 is fixed to the conical platform by a plurality of bolts 5, and the plurality of bolts 5 are arranged at intervals along the circumference of the conical sleeve 12. To avoid interference between the bolts 5 and the chamfer of the hole edge to be hammered, the top surface of the bolts 5 is set lower than the conical surface of the conical sleeve 12.

[0041] exist Figure 4 In the example, the inner surface of the conical sleeve 12 is provided with an internal thread, and the outer surface of the conical stage is provided with an external thread, and the conical sleeve 12 is connected to the conical stage through a thread. Since the conical sleeve 12 and the conical stage need to rotate to achieve the threaded connection, a roller is also provided between the conical sleeve 12 and the conical stage, refer to Figure 4 During installation, first place the roller in the opening 121 of the tapered sleeve 12 (the roller will not slip out of the opening 121), and then place the inner core 11 in the tapered sleeve 12. When the inner core 11 rotates relative to the tapered sleeve 12, the roller moves along the tapered surface of the tapered table.

[0042] The connection method between the tapered sleeve 12 and the tapered table is not limited to the method described above. For example, after placing the roller in the limiting space between the tapered sleeve 12 and the tapered table, the tapered sleeve 12 and the tapered table can be welded and fixed together.

[0043] In one embodiment, the hammering part 2 is fixedly connected to the conical surface of the conical structure of the pressure head body 1, or the hammering part 2 and the conical structure are integrally formed.

[0044] like Figure 5 As shown, a plurality of columnar hammering parts 2 are fixed on the conical surface of the conical structure, and the hammering part 2 has an arc surface facing outward, which can be a circular arc surface or other curved surface. The size of the conical structure and the hammering part 2 can be determined according to the size of the chamfer of the hole edge.

[0045] Compared with the method of installing rollers on the conical structure, the method of directly fixing the hammer part 2 on the conical structure is simple in structure, and the size of the conical structure and the hammer part 2 can be set to be smaller, and the overall volume is smaller. Therefore, this type of tool head is suitable for processing and strengthening small holes, and can strengthen the chamfering of the hole edge of the hole with a minimum hole diameter of Φ10. Of course, there is no limit to the maximum hole diameter. In addition, the method of fixing the hammer part 2 on the conical structure has good vibration transmission performance and less energy loss.

[0046] In the above embodiment, the size and number of the hammering parts 2 installed on the pressure head body 1 and the size and number of the fixed hammering parts 2 can be determined according to the size of the chamfer of the hole edge and the processing efficiency. Generally, the larger the hammering parts 2 and the more the number, the higher the processing efficiency, but the size and number of the hammering parts 2 also need to be adapted to the size of the chamfer of the hole edge.

[0047] In one embodiment, the tool head also includes a connecting rod 3 for connecting to the ultrasonic vibration device, and the connecting rod 3 is connected to the first end of the pressure head body 1, or connected to the second end of the pressure head body 1. Among them, the first end of the pressure head body 1 is close to the end of the radial dimension of the hammering surface from the center line that is smaller, and the second end is close to the end of the radial dimension of the hammering surface from the center line that is larger. The connecting rod 3 is connected to the second end of the pressure head body 1, and the chamfer of the hole edge at one end of the hole to be strengthened can be hammered. The connecting rod 3 is connected to the first end of the pressure head body 1, and the chamfer of the hole edge at the other end of the hole to be strengthened can be hammered. The connecting rod 3 is connected to the first end and the second end. Two tool heads can be formed, which can strengthen the chamfering of the hole edges at different positions. Moreover, the use of two tool heads to process the chamfers of the two ends of the same hole to be strengthened can avoid repeated tool setting, which is conducive to improving processing efficiency.

[0048] exist Figure 1-Figure 4 In the example, the pressure head body 1 is provided with a threaded hole 111, and the connecting rod 3 can be connected in the threaded hole 111 of the pressure head body 1 by threading, and then locked by the locking nut 4. The connecting rod 3 is conveniently disassembled by threading, so that the connecting rod 3 can be replaced to connect different pressure head bodies 1, which is conducive to reducing costs.

[0049] Figure 6 and Figure 7 Schematic diagrams of using two tool heads to chamfer the edges of the first opening 101 of the first workpiece 100 at both ends are shown. In this embodiment, the aperture of the first opening 101 is relatively large, with an aperture of Φ20. Figure 6 and Figure 7 The hammering part 2 on the tool head adopts a roller.

[0050] in, Figure 6 The tool head used in the invention has a connecting rod 3 connected to the second end (the large end of the conical structure) of the pressing head body 1, which can be used to chamfer the edge of the first opening 101 at the upper end thereof by hammering. Figure 7 In the tool head used in the invention, the connecting rod 3 is connected to the first end of the pressing head body 1, and the chamfering of the hole edge at the lower end of the first opening 101 can be hammered.

[0051] In actual operation, the first workpiece 100 is fixed on the machine tool, and the Figure 6 The tool head in the tool is connected to the ultrasonic vibration device, and the tool head is aligned with the center of the first opening 101. The tool head is pressed on the chamfer of the upper end of the first opening 101 with a certain static pressure, and the ultrasonic vibration device is turned on. The tool head vibrates and rotates to achieve hammer strengthening of the chamfer of the hole edge. After the chamfer strengthening of the upper end hole edge is completed, the tool head is removed from the ultrasonic vibration device and replaced. Figure 7 The tool head in the embodiment of the present invention is passed through the connecting rod 3 of the tool head from the first opening 101 and connected to the ultrasonic vibration device, and then the vibration ultrasonic device is turned on to strengthen the chamfer of the hole edge at the lower end.

[0052] Figure 8 and Fig. 9 Schematic diagrams of chamfering the edges of the second opening 201 of the second workpiece 200 using two tool heads are shown. In this embodiment, the aperture of the second opening 201 is relatively small, with an aperture of Φ12. Figure 8 The tool head shown in the figure adopts a tool head having a fixed hammer part 2.

[0053] in, Figure 8 The tool head used in the invention has a connecting rod 3 connected to the second end (the large end of the conical structure) of the pressing head body 1, and the chamfering of the hole edge at the upper end of the second opening 201 is hammered. Fig. 9 In the tool head used in the invention, the connecting rod 3 is connected to the first end of the pressing head body 1, and the chamfering of the hole edge at the lower end of the second opening 201 is hammered.

[0054] An embodiment of the present application also provides a hole edge chamfer strengthening device, comprising an ultrasonic vibration device and a tool head as described above, wherein the tool head is connected to the ultrasonic vibration device; wherein the ultrasonic vibration device is configured to drive the tool head to vibrate and rotate.

[0055] In one embodiment, the ultrasonic vibration device may include a transducer, a horn connected to the transducer, and a driving device capable of driving the transducer to rotate, wherein the driving device may be wirelessly driven with the transducer (e.g., driven by electromagnetic induction) to rotate the transducer, and the connecting rod 3 is configured to be detachably connected to the horn, so that the horn can be easily replaced with various tool heads. It is understandable that the pressing head body 1 may not be provided with the connecting rod 3, and the pressing head body 1 may be directly connected to the horn.

[0056] The resonant frequency generated by the ultrasonic vibration device is usually 20000~25000Hz, the overall length of the tool head is designed according to half wavelength, and the suspension length of the connecting rod 3 is set to 60-120mm according to the different pressing head bodies 1. The amplitude transmitted to the pressing head body 1 is 0.65-0.85 times the amplitude of the far end of the connecting rod 3.

[0057] In the description of the present application, it should be understood that the terms "center", "longitudinal", "lateral", "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, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0058] In addition, the terms "first", "second", etc. are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first", "second", etc. may explicitly or implicitly include at least one of the features.

[0059] In the description of the present application, “plurality” means at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0060] In this application, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed", etc. should be understood in a broad sense. For example, "connected" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0061] In the present application, unless otherwise clearly specified and limited, a first feature being “above” or “below” a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being “above”, “above”, and “above” a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being “below”, “below”, and “below” a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0062] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example" or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0063] Although the embodiments of the present application have been shown and described above, it can be understood that the above embodiments are exemplary and cannot be understood as limitations on the present application. Ordinary technicians in this field can change, modify, replace and modify the above embodiments within the scope of the present application.

Claims

1. A tool head for strengthening chamfering of hole edges, characterized in that: include: A pressure head body, arranged to be connected to the ultrasonic vibration device so as to vibrate and rotate around a center line under the drive of the ultrasonic vibration device, and the pressure head body has a first end and a second end in the direction of the center line; A plurality of hammering parts are arranged at intervals in the circumferential direction on the same circumference around the center line of the pressure head body; Among them, each of the hammering parts has a hammering surface for contacting the chamfer of the hole edge to be strengthened, and the hammering surface is arranged to be radially inclined outward from the first end toward the second end, so that when the tool head is set so that the center line is consistent with the center of the hole to be strengthened, the hammering surface is parallel to the chamfer of the hole edge to be strengthened.

2. The tool head according to claim 1, characterized in that: The hammering surface is an arcuate surface on the radial outer side of the hammering portion.

3. The tool head according to claim 1, characterized in that: The pressure head body includes a conical structure, and the hammer portion protrudes from a conical surface of the conical structure.

4. The tool head according to claim 3, characterized in that: The hammering part is a roller installed on the conical structure. The roller is rotatable relative to the conical structure, and the outer peripheral surface of the roller is the hammering surface.

5. The tool head according to claim 4, characterized in that: The pressure head body includes an inner core and a conical sleeve with the conical surface which is sleeved on the outer side of the inner core. The inner core and the conical sleeve are assembled to form a conical structure. The conical sleeve is provided with a plurality of openings corresponding to the rollers at intervals along the circumferential direction, and the roller part protrudes from the opening.

6. The tool head according to claim 5, characterized in that The tapered sleeve and the inner core cooperate to form a limiting space for limiting the position of the roller, and the roller is rotatable in the limiting space; The roller has a consistent cross-section in the length direction, the opening is a square hole, the width of the opening of the square hole toward the outer end in the radial direction of the roller is smaller than the outer diameter of the roller, and the width of the opening of the directional hole toward the inner end is larger than the outer diameter of the roller.

7. The tool head according to claim 6, characterized in that The inner core is a conical platform. When the outer side of the roller abuts against the chamfer of the hole edge and rolls, the inner side abuts against the conical surface of the conical platform.

8. The tool head according to claim 7, characterized in that The conical sleeve is fixed to the conical platform by a plurality of bolts, and the plurality of bolts are arranged at intervals along the circumference of the conical sleeve; Alternatively, the inner surface of the tapered sleeve is provided with an internal thread, the outer surface of the tapered platform is provided with an external thread, and the tapered sleeve is connected to the tapered platform via threads.

9. The tool head according to claim 3, characterized in that: The hammering part is fixedly connected to the conical surface of the conical structure, or the hammering part and the conical structure are integrally formed.

10. The tool head according to any one of claims 1 to 9, characterized in that: It also includes a connecting rod for connecting to the ultrasonic vibration device, wherein the connecting rod is connected to the first end of the pressure head body or to the second end of the pressure head body.

11. A hole edge chamfer strengthening device, characterized in that: It comprises an ultrasonic vibration device and a tool head according to any one of claims 1 to 10, wherein the tool head is connected to the ultrasonic vibration device; wherein the ultrasonic vibration device is configured to drive the tool head to vibrate and rotate.

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