Ultrasonic machining device

Abstract

The invention discloses an ultrasonic machining device. The ultrasonic machining device comprises a base; the ultrasonic vibration assembly comprises a stator and a piezoelectric ceramic piece, the stator is fixedly arranged below the base, and the piezoelectric ceramic piece is arranged at the top of the stator; the transmission assembly comprises a gear ring, a rotor and a planet wheel, the gear ring is fixedly arranged below the stator, the rotor is rotatably connected to the base and located in the gear ring, the planet wheel is rotatably arranged on the edge of the rotor and engaged with the gear ring, and the stator abuts against the rotor; the grinding disc is arranged below the rotor; a containing cavity used for containing the cylindrical roller is formed in the planet wheel in the axial direction of the planet wheel in a penetrating mode, and the containing cavity can enable the curved surface of the contained cylindrical roller to abut against the stator and the grinding disc at the same time. The containing cavity is configured to allow the contained cylindrical rollers to rotate around the axes of the cylindrical rollers relative to the planet wheel, and the planet wheel can drive the cylindrical rollers to rotate synchronously. By the adoption of the structure, the machining effect can be improved, and the consistency of the removal rate of materials at the two ends of the cylindrical roller can be improved.

Description

Technical Field

[0001] The present application relates to the technical field of ultrasonic machining, and in particular to an ultrasonic machining device. Background Art

[0002] With the continuous advancement of science and technology, the requirements for various performances of bearings in the fields of precision machine tools, aerospace equipment and precision instruments are constantly increasing, and the rollers of bearings are prone to fatigue failure, which affects the service life of bearings. Therefore, it is necessary to improve the fatigue strength of the rollers of bearings through fine machining. Among them, the fine machining of cylindrical rollers is mainly centerless grinding, and can also be finely machined through chemical mechanical fine machining, electrochemical mechanical composite polishing, magnetic fluid grinding and other processing methods. However, these processing methods have problems such as low processing efficiency, complex procedures and high processing costs.

[0003] Ultrasonic machining technology is not affected by the electrical conductivity of materials and can be used to process metal and non-metal materials. It has been applied in many fields, such as ultrasonic welding, ultrasonic milling and ultrasonic grinding. In recent years, ultrasonic machining technology has been widely used because of its good machining quality. Among them, the effect of ultrasonic hammering can modify the metal surface, thereby improving the fatigue strength of the metal surface.

[0004] In order to improve the problems existing in the traditional processing method of fine-machining cylindrical rollers, ultrasonic machining technology is used in the related art to fine-machining cylindrical rollers. However, the existing ultrasonic machining devices for fine-machining cylindrical rollers all use a single standing wave, and the machining effect is not ideal. In addition, when the existing ultrasonic machining devices for fine-machining cylindrical rollers are fine-machining cylindrical rollers, each cylindrical roller can usually only revolve around the center line of the circular distribution and rotate around its own axis. When each cylindrical roller revolves around the center line of the circular distribution, the ultrasonic grinding radius of the end of the cylindrical roller close to the center line is the smallest, and the ultrasonic grinding radius of the end of the cylindrical roller far from the center line is the largest, resulting in inconsistent material removal rates at both ends of the cylindrical roller. Summary of the invention

[0005] The present application aims to solve at least one of the technical problems existing in the prior art. To this end, the present application proposes an ultrasonic machining device that uses traveling waves to perform fine machining on a cylindrical roller, which is beneficial to improving the machining effect. In addition, during the machining process, the consistency of the material removal rate at both ends of the cylindrical roller can also be improved.

[0006] According to an embodiment of the present application, the ultrasonic machining device includes: a base; an ultrasonic vibration component, including a stator and a piezoelectric ceramic sheet, wherein the stator is fixedly arranged below the base, and the piezoelectric ceramic sheet is arranged on the top of the stator; a transmission component, including a ring gear, a rotor and a planetary wheel, wherein the ring gear is fixedly arranged below the stator, the rotor is rotatably connected to the base and is located in the ring gear, the planetary wheel is rotatably arranged at the edge of the rotor and meshes with the ring gear, and the stator is abutted against the rotor; a grinding disk is arranged below the rotor; wherein the planetary wheel is provided with an accommodating cavity for accommodating a cylindrical roller along its own axial direction, the accommodating cavity can make the curved surface of the accommodated cylindrical roller abut against the stator and the grinding disk at the same time, and the accommodating cavity is configured to allow the accommodated cylindrical roller to rotate around its own axis relative to the planetary wheel and the planetary wheel can drive the cylindrical roller to rotate synchronously.

[0007] According to the ultrasonic machining device of the embodiment of the present application, at least the following beneficial effects are achieved: when in use, the cylindrical roller to be machined is placed in the accommodating cavity, and the curved surface of the cylindrical roller is simultaneously pressed against the stator and the grinding disc, and then the piezoelectric ceramic piece is connected to a preset signal, so that the piezoelectric ceramic piece can generate a traveling wave, and the traveling wave generated by the piezoelectric ceramic piece acts on the rotor and the cylindrical roller in the accommodating cavity after the amplitude is amplified by the stator. The traveling wave acting on the rotor can drive the rotor to rotate, thereby driving the planetary gear to revolve around the axis of the gear ring, and then driving the cylindrical roller in the accommodating cavity to revolve around the axis of the gear ring; when the planetary gear revolves around the axis of the gear ring, due to the action of the gear ring, the planetary gear can rotate around its own axis, and then drive the cylindrical roller in the accommodating cavity to rotate synchronously around the axis of the planetary gear; the traveling wave acting on the cylindrical roller in the accommodating cavity can drive the cylindrical roller to rotate around its own axis. During the machining process, the stator ultrasonically high-frequency hammers the cylindrical roller in the accommodating cavity under the action of ultrasonic energy, and at the same time, the cylindrical roller in the accommodating cavity is ground by a grinding disc to improve the fatigue strength of the cylindrical roller. Compared with the prior art, the ultrasonic machining device of the embodiment of the present application uses traveling waves to perform fine machining on the cylindrical roller, which is conducive to improving the machining effect. In addition, the planetary gear can drive the cylindrical roller in the accommodating cavity to rotate synchronously around the axis of the planetary gear, that is, the end of the cylindrical roller in the accommodating cavity close to the axis of the gear ring is not fixed, thereby improving the consistency of the material removal rate at both ends of the cylindrical roller.

[0008] According to some embodiments of the present application, the ultrasonic machining device further includes a preload force adjustment component, wherein the preload force adjustment component is disposed between the base and the rotor, and the preload force adjustment component is used to adjust the preload force between the rotor and the stator.

[0009] According to some embodiments of the present application, the preload adjustment assembly includes a connecting shaft, an adjusting nut and a thrust bearing, a first mounting through hole is provided in the middle of the rotor, an avoidance through hole is provided in the middle of the stator, a second mounting through hole is provided on the base, the connecting shaft is simultaneously passed through the first mounting through hole, the avoidance through hole and the second mounting through hole, one end of the connecting shaft close to the rotor is fixedly connected to the rotor, one end of the connecting shaft close to the base is provided with a threaded connection structure, the adjusting nut is threadedly connected to one end of the connecting shaft close to the base, and the thrust bearing is provided on the connecting shaft and clamped between the adjusting nut and the base.

[0010] According to some embodiments of the present application, the connecting shaft has a first connecting portion at one end close to the rotor, and the rotor and the first connecting portion are fixedly connected by a first fastener.

[0011] According to some embodiments of the present application, a radial bearing located in the avoidance through hole is provided on the connecting shaft.

[0012] According to some embodiments of the present application, an arc-shaped groove is provided on the edge of the rotor, the planetary gear is partially accommodated in the arc-shaped groove, the arc-shaped groove passes through the rotor along the axial direction of the rotor, and a first limiting portion is formed on the rotor for limiting the planetary gear from disengaging from the arc-shaped groove along the axial direction of the rotor.

[0013] According to some embodiments of the present application, a limiting structure is provided on the ring gear corresponding to the planetary gear.

[0014] According to some embodiments of the present application, the limiting structure includes a limiting ring plate, which is detachably arranged on the side of the gear ring facing the base, the inner edge of the limiting ring plate protrudes from the inner edge of the gear ring, and the inner edge of the gear ring facing away from the base is provided with a second limiting portion extending inward.

[0015] According to some embodiments of the present application, the cross-section of the accommodating cavity is in the shape of a regular polygon.

[0016] According to some embodiments of the present application, a bracket is arranged between the stator and the base, one end of the bracket has a second connecting portion, the base, the second connecting portion and the stator are fixedly connected by a second fastener, the other end of the bracket has a third connecting portion, the ring gear and the third connecting portion are fixedly connected by a third fastener, and the dimension of the second connecting portion along the axial direction of the ring gear is smaller than the dimension of the third connecting portion along the axial direction of the ring gear.

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

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

[0019] Figure 1 is a schematic structural diagram of an ultrasonic machining device according to an embodiment of the present application;

[0020] Figure 2 It is a partial structural schematic diagram of an ultrasonic machining device according to an embodiment of the present application;

[0021] Figure 3 is a partial structural schematic diagram of an ultrasonic machining device according to an embodiment of the present application from another perspective;

[0022] Figure 4 yes Figure 3 A partial enlarged schematic diagram in the middle;

[0023] Figure 5 is a partial cross-sectional schematic diagram of an ultrasonic machining device according to an embodiment of the present application with the grinding disc hidden;

[0024] Figure 6 is an exploded schematic diagram of an ultrasonic machining device according to an embodiment of the present application;

[0025] Figure 7 is a structural schematic diagram of a stator in an ultrasonic machining device according to an embodiment of the present application;

[0026] Figure 8 is a schematic structural diagram of a rotor in an ultrasonic machining device according to an embodiment of the present application;

[0027] Fig. 9 is a schematic structural diagram of a gear ring in an ultrasonic machining device according to an embodiment of the present application;

[0028] Fig.10 It is a schematic diagram of the structure of a bracket in an ultrasonic machining device according to an embodiment of the present application.

[0029] Reference numerals:

[0030] Cylindrical roller a;

[0031] Base 100, second mounting through hole 110;

[0032] Stator 210, tooth slot 211, avoidance through hole 212, piezoelectric ceramic sheet 220;

[0033] The ring gear 310, the second limiting portion 311, the rotor 320, the first mounting through hole 321, the arc-shaped groove 322, the first limiting portion 323, the planetary gear 330, and the accommodating cavity 331;

[0034] Grinding disc 400;

[0035] A connecting shaft 510, a first connecting portion 511, an adjusting nut 520, a thrust bearing 530, a first fastening member 540, and a radial bearing 550;

[0036] Limiting ring 600;

[0037] Bracket 700, second connection portion 710, third connection portion 720;

[0038] The second fastening member 800 and the third fastening member 900 . DETAILED DESCRIPTION

[0039] The embodiments of the present application are described in detail below, and 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 only used to explain the present application, and cannot be understood as limiting the present application.

[0040] In the description of the present application, it should be understood that if orientation descriptions are involved, the orientations or positional relationships indicated, such as up, down, front, back, left, and right, are based on the orientations or positional relationships shown in the accompanying drawings. This is only for the convenience of describing the present application and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it should not be understood as a limitation on the present application.

[0041] In the description of this application, if the words "some", "greater than", "less than", "exceed", "above", "below", "within" etc. appear, "some" means one or more, "more" means more than two, "greater than", "less than", "exceed", etc. are understood to exclude the number, and "above", "below", "within", etc. are understood to include the number.

[0042] In the description of this application, if the words "first", "second", etc. appear, they are only used to distinguish technical features and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features or implicitly indicating the order of the indicated technical features.

[0043] In the description of this application, unless otherwise clearly defined, terms such as setting, installing, connecting, etc. should be understood in a broad sense, and technicians in the relevant technical field can reasonably determine the specific meanings of the above terms in this application based on the specific content of the technical solution.

[0044] Reference Figures 1 to 10According to an embodiment of the present application, the ultrasonic machining device includes a base 100, an ultrasonic vibration component, a transmission component and a grinding disc 400.

[0045] Specifically, the ultrasonic vibration component includes a stator 210 and a piezoelectric ceramic sheet 220, the stator 210 is fixedly arranged below the base 100, the piezoelectric ceramic sheet 220 is arranged at the top of the stator 210 (that is, the side of the stator 210 facing the base 100), the transmission component includes a ring gear 310, a rotor 320 and a planetary gear 330, the ring gear 310 is fixedly arranged below the stator 210 (that is, the side of the stator 210 facing away from the base 100), the rotor 320 is rotatably connected to the base 100 and is located in the ring gear 310, the planetary gear 330 is rotatably arranged at the edge of the rotor 320 and meshes with the ring gear 310, and the stator 210 faces away from the base. One side of the planetary wheel 330 is abutted against the rotor 320, and the grinding disk 400 is arranged below the rotor 320 (that is, the side of the rotor 320 facing away from the stator 210), wherein the planetary wheel 330 is penetrated along its own axial direction with a receiving cavity 331 for accommodating the cylindrical roller a, that is, the receiving cavity 331 penetrates the planetary wheel 330 along the axial direction of the planetary wheel 330, and the receiving cavity 331 is configured to enable the curved surface of the accommodated cylindrical roller a to be abutted against the stator 210 and the grinding disk 400 at the same time, and at the same time, the receiving cavity 331 is configured to allow the accommodated cylindrical roller a to rotate around its own axis relative to the planetary wheel 330 and the planetary wheel 330 can drive the cylindrical roller a to rotate synchronously.

[0046] When in use, the cylindrical roller a to be processed is placed in the accommodating cavity 331, and the curved surface of the cylindrical roller a is simultaneously pressed against the stator 210 and the grinding disc 400. Then, the piezoelectric ceramic piece 220 is connected to a preset signal, so that the piezoelectric ceramic piece 220 can generate a traveling wave. The traveling wave generated by the piezoelectric ceramic piece 220 acts on the rotor 320 and the cylindrical roller a in the accommodating cavity 331 after the amplitude is amplified by the stator 210. The traveling wave acting on the rotor 320 can drive the rotor 320 to rotate, thereby driving the planetary gear 330 to revolve around the axis of the gear ring 310, and then driving the cylindrical roller a in the accommodating cavity 331 to revolve around the axis of the gear ring 310; when the planetary gear 330 revolves around the axis of the gear ring 310, due to the action of the gear ring 310, the planetary gear 330 can rotate around its own axis, and then drive the cylindrical roller a in the accommodating cavity 331 to rotate synchronously around the axis of the planetary gear 330; the traveling wave acting on the cylindrical roller a in the accommodating cavity 331 can drive the cylindrical roller a to rotate around its own axis. During the processing, the stator 210 ultrasonically high-frequency hammers the cylindrical roller a in the accommodating cavity 331 under the action of ultrasonic energy, and at the same time, the cylindrical roller a in the accommodating cavity 331 is ground by the grinding disc 400 to improve the fatigue strength of the cylindrical roller a. Compared with the prior art, the ultrasonic machining device of the embodiment of the present application uses traveling waves to perform fine machining on the cylindrical roller a, which is beneficial to improving the machining effect. In addition, the planetary gear 330 can drive the cylindrical roller a in the accommodating cavity 331 to rotate synchronously around the axis of the planetary gear 330, that is, the end of the cylindrical roller a in the accommodating cavity 331 close to the axis of the ring gear 310 is not fixed, thereby improving the consistency of the material removal rate at both ends of the cylindrical roller a.

[0047] Specifically, compared to standing waves, traveling waves have uniform energy distribution, which reduces surface defects of cylindrical roller a caused by local energy concentration. In addition, the generation of traveling waves causes particles on the surface of stator 210 to move in space with an elliptical motion trajectory. Compared to the case where only radial force is generated during standing wave processing, traveling wave particles will not only generate radial force on the curved surface of cylindrical roller a, but also generate tangential force, which is beneficial to improving material removal efficiency and processing accuracy.

[0048] Specifically, under the action of ultrasonic energy, the stator 210 ultrasonically high-frequency hammers the cylindrical roller a in the accommodating cavity 331, so that the grains on the surface of the cylindrical roller a are refined. At the same time, the residual compressive stress generated can improve the fatigue strength of the cylindrical roller a.

[0049] It should be noted that the above-mentioned ring gear 310 , rotor 320 and planetary gear 330 constitute a planetary gear mechanism.

[0050] Specifically, the axis of the cylindrical roller a placed in the accommodating cavity 331 is perpendicular to the axis of the planetary gear 330 .

[0051] Specifically, the stator 210 is a metal elastic member having a plurality of tooth slots 211 distributed at intervals, which is similar to the stator structure of an ultrasonic motor.

[0052] Reference Figure 3 and Figure 6 In some of the embodiments, the transmission assembly includes at least two planetary gears 330, so that at least two cylindrical rollers a can be processed simultaneously, which is beneficial to improving the processing efficiency.

[0053] It should be noted that, in some of the embodiments, the grinding disc 400 is also used to carry abrasives of a preset concentration. The abrasives carried by the grinding disc 400 undergo ultrasonic cavitation effect under the action of ultrasonic vibration. Specifically, the bubbles in the liquid expand and burst after reaching a critical value. The high-speed microjets generated after the bubble bursts flush the surface of the cylindrical roller a, which can prevent the accumulation of wear debris on the surface of the cylindrical roller a. At the same time, the water hammer effect brought about by the high-speed microjets generated after the bubble bursts can accelerate the removal of material on the surface of the cylindrical roller a. In addition, the strong impact brought about by the high-speed microjets generated after the bubble bursts will compact the microscopic surface of the cylindrical roller a, which is beneficial to the grain refinement of the surface of the cylindrical roller a, thereby improving the fatigue strength of the cylindrical roller a.

[0054] The abrasive material is silicon carbide abrasive. Of course, the abrasive material may also be diamond abrasive or aluminum oxide abrasive, or other types of abrasives, which are not limited here.

[0055] It should be noted that, in some embodiments, the grinding disc 400 is connected to a driving motor, and the driving motor is used to drive the grinding disc 400 to rotate to improve the grinding effect.

[0056] Specifically, the piezoelectric ceramic sheet 220 is bonded to the top of the stator 210 by an adhesive.

[0057] It should be noted that, in some of the embodiments, the ultrasonic machining device also includes a preload adjustment component, which is arranged between the base 100 and the rotor 320. The preload adjustment component is used to adjust the preload between the rotor 320 and the stator 210, so as to ensure the transmission effect of the transmission component.

[0058] Reference Figures 5 to 8In some embodiments, the preload force adjustment assembly includes a connecting shaft 510, an adjusting nut 520 and a thrust bearing 530. A first mounting through hole 321 is provided in the middle of the rotor 320, an avoidance through hole 212 is provided in the middle of the stator 210, a second mounting through hole 110 is provided on the base 100, and the connecting shaft 510 is simultaneously penetrated in the first mounting through hole 321, the avoidance through hole 212 and the second mounting through hole 110. One end of the connecting shaft 510 close to the rotor 320 is fixedly connected to the rotor 320, one end of the connecting shaft 510 close to the base 100 is provided with a threaded connection structure, the adjusting nut 520 is threadedly connected to one end of the connecting shaft 510 close to the base 100, and the thrust bearing 530 is provided on the connecting shaft 510 and sandwiched between the adjusting nut 520 and the base 100. When in use, the preload force between the rotor 320 and the stator 210 can be adjusted by screwing the adjusting nut 520. The thrust bearing 530 is used to ensure that the connecting shaft 510 can rotate relative to the base 100 without being affected by the above-mentioned preload force.

[0059] Specifically, the thrust bearing 530 adopts a thrust ball bearing. Of course, the thrust bearing 530 can also adopt a thrust roller bearing, which is not limited here.

[0060] Reference Figure 3 and Figure 6 In some embodiments, the connecting shaft 510 has a first connecting portion 511 at one end close to the rotor 320, and the rotor 320 and the first connecting portion 511 are fixedly connected by a first fastener 540, which has a simple structure and is easy to implement.

[0061] Specifically, the first fastener 540 is a screw to facilitate installation and removal of the rotor 320 .

[0062] It should be noted that in some other embodiments, the rotor 320 and the connecting shaft 510 may also be welded together or integrally formed, which is not limited here. In this case, the first connecting portion 511 and the first fastener 540 mentioned above are not required.

[0063] Reference Figure 6 In some of the embodiments, a radial bearing 550 located in the avoidance through hole 212 is provided on the connecting shaft 510, which is beneficial to improving the rotatability of the connecting shaft 510.

[0064] Specifically, the radial bearing 550 may be a radial ball bearing or a radial roller bearing, which is not limited herein.

[0065] Reference Figure 3 , Figure 4 , Figure 6 and Figure 8In some embodiments, an arc-shaped groove 322 is provided at the edge of the rotor 320, and the planetary gear 330 is partially accommodated in the arc-shaped groove 322. The arc-shaped groove 322 penetrates the rotor 320 along the axial direction of the rotor 320. A first limiting portion 323 is formed on the rotor 320 for limiting the planetary gear 330 from escaping from the arc-shaped groove 322 along the axial direction of the rotor 320. The structure is simple and easy to implement.

[0066] It should be noted that, in some of the embodiments, a limiting structure is provided on the ring gear 310 corresponding to the planetary gear 330, which is beneficial to improving the stability and reliability of the structure.

[0067] Reference Figure 1 , Figure 2 , Figure 4 , Figure 5 , Figure 6 and Fig. 9 In some embodiments, the limiting structure includes a limiting ring piece 600, which is detachably disposed on the side of the ring gear 310 facing the base 100, and the inner edge of the limiting ring piece 600 protrudes from the inner edge of the ring gear 310, and the inner edge of the side of the ring gear 310 facing away from the base 100 is provided with a second limiting portion 311 extending inwardly, which has a simple structure and is easy to implement. The limiting ring piece 600 is detachably disposed on the side of the ring gear 310 facing the base 100, so as to facilitate the installation and removal of the rotor 320 and the planetary gear 330.

[0068] Specifically, the limiting ring piece 600 may be connected to the gear ring 310 via screws, or may be connected to the gear ring 310 via a clamping structure, which is not limited herein.

[0069] It should be noted that, in some of the embodiments, the cross-section of the accommodating cavity 331 is in the shape of a regular polygon, so that the accommodating cavity 331 can limit the accommodated cylindrical roller a from rotating around the axis of the planetary gear 330 relative to the planetary gear 330, that is, the planetary gear 330 can drive the cylindrical roller a to rotate synchronously, and at the same time, the accommodating cavity 331 will not limit the cylindrical roller a from rotating around its own axis relative to the planetary gear 330.

[0070] It should be noted that, in some embodiments, the cross-section of the accommodating cavity 331 is in the shape of a regular octagon.

[0071] It should be noted that, in some other embodiments, the cross-section of the accommodating cavity 331 may also be in the shape of a regular triangle, a square, a regular pentagon or other regular polygons, which is not limited here.

[0072] Reference Figure 1 , Figure 2 , Figure 5 , Figure 6 and Fig.10In some embodiments, a bracket 700 is provided between the stator 210 and the base 100, one end of the bracket 700 has a second connection portion 710, the base 100, the second connection portion 710 and the stator 210 are fixedly connected by a second fastener 800, the other end of the bracket 700 has a third connection portion 720, the ring gear 310 and the third connection portion 720 are fixedly connected by a third fastener 900, and the structure is simple and easy to implement. The dimension of the second connection portion 710 along the axial direction of the ring gear 310 is smaller than the dimension of the third connection portion 720 along the axial direction of the ring gear 310, so that the stator 210 and the ring gear 310 can be staggered with each other along the axial direction of the ring gear 310.

[0073] Specifically, the second fastener 800 and the third fastener 900 are both screws. The limiting ring piece 600 is fixed by the third fastener 900 and sandwiched between the third connecting portion 720 and the gear ring 310 .

[0074] It should be noted that, in some other embodiments, the second fastener 800 and the third fastener 900 may also be pins, which is not limited here.

[0075] In the description of this specification, if the description involves reference terms such as "one embodiment", "some embodiments", "illustrative embodiments", "examples", "specific examples" and "some examples", it 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 representation of the above terms does 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.

[0076] Although the embodiments of the present application 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 spirit of the present application, and that the scope of the present application is defined by the claims and their equivalents.

Claims

1. An ultrasonic machining device, characterized in that: include: Pedestal; An ultrasonic vibration component, comprising a stator and a piezoelectric ceramic sheet, wherein the stator is fixedly arranged below the base, and the piezoelectric ceramic sheet is arranged on the top of the stator; A transmission assembly, comprising a ring gear, a rotor and a planetary gear, wherein the ring gear is fixedly arranged below the stator, the rotor is rotatably connected to the base and is located in the ring gear, the planetary gear is rotatably arranged on the edge of the rotor and meshes with the ring gear, and the stator is held against the rotor; A grinding disc, disposed below the rotor; Among them, the planetary wheel is provided with a receiving cavity for accommodating a cylindrical roller along its own axial direction, and the receiving cavity can make the curved surface of the accommodated cylindrical roller simultaneously abut against the stator and the grinding disk, and the receiving cavity is configured to allow the accommodated cylindrical roller to rotate around its own axis relative to the planetary wheel and the planetary wheel can drive the cylindrical roller to rotate synchronously.

2. The ultrasonic machining device according to claim 1, characterized in that: The ultrasonic machining device further comprises a preload force adjusting component, wherein the preload force adjusting component is arranged between the base and the rotor, and the preload force adjusting component is used to adjust the preload force between the rotor and the stator.

3. The ultrasonic machining device according to claim 2, characterized in that: The preload adjustment assembly includes a connecting shaft, an adjusting nut and a thrust bearing. A first mounting through hole is provided in the middle of the rotor, an avoidance through hole is provided in the middle of the stator, and a second mounting through hole is provided on the base. The connecting shaft is simultaneously passed through the first mounting through hole, the avoidance through hole and the second mounting through hole. One end of the connecting shaft close to the rotor is fixedly connected to the rotor, one end of the connecting shaft close to the base is provided with a threaded connection structure, the adjusting nut is threadedly connected to one end of the connecting shaft close to the base, and the thrust bearing is provided on the connecting shaft and clamped between the adjusting nut and the base.

4. The ultrasonic machining device according to claim 3, characterized in that: The connecting shaft has a first connecting portion at one end close to the rotor, and the rotor and the first connecting portion are fixedly connected by a first fastener.

5. The ultrasonic machining device according to claim 3, characterized in that: The connecting shaft is provided with a radial bearing located in the avoidance through hole.

6. The ultrasonic machining device according to claim 1, characterized in that: An arc-shaped groove is provided at the edge of the rotor, the planetary gear is partially accommodated in the arc-shaped groove, the arc-shaped groove penetrates the rotor along the axial direction of the rotor, and a first limiting portion is formed on the rotor for limiting the planetary gear from escaping from the arc-shaped groove along the axial direction of the rotor.

7. The ultrasonic machining device according to claim 6, characterized in that: A limiting structure is arranged on the gear ring corresponding to the planetary gear.

8. The ultrasonic machining device according to claim 7, characterized in that: The limiting structure includes a limiting ring plate, which is detachably arranged on the side of the gear ring facing the base, the inner edge of the limiting ring plate protrudes from the inner edge of the gear ring, and the inner edge of the side of the gear ring facing away from the base is provided with a second limiting portion extending inward.

9. The ultrasonic machining device according to claim 1, characterized in that: The cross section of the accommodating cavity is in the shape of a regular polygon.

10. The ultrasonic machining device according to claim 1, characterized in that: A bracket is arranged between the stator and the base, one end of the bracket has a second connecting portion, the base, the second connecting portion and the stator are fixedly connected by a second fastener, the other end of the bracket has a third connecting portion, the ring gear and the third connecting portion are fixedly connected by a third fastener, and the axial dimension of the second connecting portion along the ring gear is smaller than the axial dimension of the third connecting portion along the ring gear.

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