Ultrasonic machining device

Abstract

The application discloses an ultrasonic machining device, comprising a base, an ultrasonic vibration assembly, a transmission assembly, a grinding disc and a cylindrical roller, wherein the ultrasonic vibration assembly comprises a stator and a piezoelectric ceramic sheet, the stator is fixed below the base, and the piezoelectric ceramic sheet is arranged on the top of the stator; the transmission assembly comprises a gear ring, a rotor and a planetary gear, the gear ring is fixed below the stator, the rotor is rotatably connected to the base and located in the gear ring, the planetary gear 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; wherein the planetary gear is provided with an accommodation cavity for accommodating the cylindrical roller along the axial direction of the planetary gear, the accommodation cavity can make the curved surface of the accommodated cylindrical roller abut against the stator and the grinding disc at the same time, and the accommodation cavity is configured to allow the accommodated cylindrical roller to rotate around the axis of the cylindrical roller relative to the planetary gear and the planetary gear to drive the cylindrical roller to rotate synchronously. The above structure is not only beneficial to improving the machining effect, but also can improve the consistency of the removal rate of the materials at both ends of the cylindrical roller.

Description

Technical Field

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

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

[0003] Ultrasonic machining technology is unaffected by the material's electrical conductivity and can be used to process both metal and non-metal materials. It has been applied in various fields, such as ultrasonic welding, ultrasonic milling, and ultrasonic grinding. In recent years, ultrasonic machining has been widely used due to its ability to achieve excellent machining quality. The ultrasonic hammering effect can modify the metal surface, thereby improving its fatigue strength.

[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 fine-machining cylindrical rollers, the existing ultrasonic machining devices for fine-machining cylindrical rollers can usually only revolve around the center line of the circumferential distribution and rotate around its own axis. When the cylindrical rollers revolve around the center line of the circumferential 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 cylindrical rollers, which is beneficial for improving the machining effect and, in addition, can improve the consistency of the material removal rate at both ends of the cylindrical roller during the machining process.

[0006] The ultrasonic machining device according to the embodiments of the present application comprises a base, an ultrasonic vibration assembly comprising a stator and a piezoelectric ceramic sheet, the stator being fixed below the base, and the piezoelectric ceramic sheet being arranged on the top of the stator; a transmission assembly comprising a gear ring, a rotor and a planetary gear, the gear ring being fixed below the stator, the rotor being rotatably connected to the base and located in the gear ring, the planetary gear being rotatably arranged on the edge of the rotor and engaged with the gear ring, and the stator abutting against the rotor; and a grinding disc arranged below the rotor; wherein the planetary gear is provided with a receiving cavity for accommodating a cylindrical roller along the axial direction of the planetary gear, the receiving cavity can make the curved surface of the cylindrical roller accommodated therein abut against the stator and the grinding disc at the same time, and the receiving cavity is configured to allow the cylindrical roller accommodated therein to rotate about the axis thereof relative to the planetary gear and the planetary gear to drive the cylindrical roller to rotate synchronously.

[0007] The ultrasonic machining device according to the embodiments of the present application has at least the following beneficial effects: during use, the cylindrical roller to be machined is placed in the receiving cavity, and the curved surface of the cylindrical roller abuts against the stator and the grinding disc at the same time, then the piezoelectric ceramic sheet is connected to a preset signal, so that the piezoelectric ceramic sheet generates a traveling wave, the traveling wave generated by the piezoelectric ceramic sheet is amplified by the stator and then acts on the rotor and the cylindrical roller in the receiving cavity. The traveling wave acting on the rotor can drive the rotor to rotate, thereby driving the planetary gear to revolve about the axis of the gear ring, and further driving the cylindrical roller in the receiving cavity to revolve about the axis of the gear ring; when the planetary gear revolves about the axis of the gear ring, the planetary gear can rotate about the axis thereof due to the action of the gear ring, thereby driving the cylindrical roller in the receiving cavity to rotate synchronously about the axis of the planetary gear; the traveling wave acting on the cylindrical roller in the receiving cavity can drive the cylindrical roller to rotate about the axis thereof. During the machining process, the stator hammers the cylindrical roller in the receiving cavity under the action of ultrasonic energy, and at the same time, the grinding disc grinds the cylindrical roller in the receiving cavity to improve the fatigue strength of the cylindrical roller. Compared with the prior art, the ultrasonic machining device according to the embodiments of the present application uses a traveling wave to finish machining the cylindrical roller, which is conducive to improving the machining effect, and in addition, the planetary gear can drive the cylindrical roller in the receiving cavity to rotate synchronously about the axis of the planetary gear, that is, the end of the cylindrical roller in the receiving cavity close to the axis of the gear ring is not fixed, thereby improving the consistency of the material removal rate of the two ends of the cylindrical roller.

[0008] According to some embodiments of the present application, the ultrasonic machining device further comprises a pre-tightening force adjusting assembly arranged between the base and the rotor, the pre-tightening force adjusting assembly being used to adjust the pre-tightening force between the rotor and the stator.

[0009] According to some embodiments of the present application, the pre-tightening force adjusting assembly comprises a connecting shaft, an adjusting nut and a thrust bearing, the middle part of the rotor is provided with a first mounting through hole, the middle part of the stator is provided with an avoiding through hole, the base is provided with a second mounting through hole, the connecting shaft is simultaneously arranged in the first mounting through hole, the avoiding through hole and the second mounting through hole, one end of the connecting shaft close to the rotor is fixedly connected to the rotor, the other end of the connecting shaft close to the base is provided with a threaded connection structure, the adjusting nut is threadedly connected to the other end of the connecting shaft close to the base, and the thrust bearing is arranged on the connecting shaft and clamped between the adjusting nut and the base.

[0010] According to some embodiments of the present application, the one end of the connecting shaft close to the rotor is provided with a first connecting part, and the rotor and the first connecting part are fixedly connected through a first fastener.

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

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

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

[0014] According to some embodiments of the present application, the limiting structure comprises a limiting ring piece which is detachably arranged on the side of the gear ring facing the base, the inner edge of the limiting ring piece 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 part extending inwardly.

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

[0016] According to some embodiments of the present application, a support is arranged between the stator and the base, one end of the support is provided with a second connecting part, the base, the second connecting part and the stator are fixedly connected through a second fastener, the other end of the support is provided with a third connecting part, the gear ring and the third connecting part are fixedly connected through a third fastener, and the size of the second connecting part along the axial direction of the gear ring is smaller than the size of the third connecting part along the axial direction of the gear ring.

[0017] Additional aspects and advantages of the application will be set forth in part in the description which follows, and in part will become apparent to those skilled in the art upon examination of the following and / or can be learned by practice of the application. BRIEF DESCRIPTION OF DRAWINGS

[0018] The foregoing and / or additional aspects and advantages of the present application are achieved by providing an ultrasonic machining device as specified in the claims.

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

[0020] Figure 2 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 is a partial structural schematic diagram of an ultrasonic machining device according to an embodiment of the present application; Figure 3 is a partial enlarged schematic diagram of A in FIG. 1;

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

[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 structural schematic diagram of a rotor in an ultrasonic machining device according to an embodiment of the present application;

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

[0028] Figure 10 is a structural schematic diagram of a support 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 gear ring 310, the second limiting part 311, the rotor 320, the first mounting through hole 321, the arc-shaped recess 322, the first limiting part 323, the planetary gear 330, the accommodating cavity 331;

[0034] The grinding disc 400;

[0035] The connecting shaft 510, the first connecting part 511, the adjusting nut 520, the thrust bearing 530, the first fastener 540, the radial bearing 550;

[0036] The limiting ring piece 600;

[0037] The bracket 700, the second connecting part 710, the third connecting part 720;

[0038] The second fastener 800, the third fastener 900. DETAILED DESCRIPTION

[0039] The embodiments of the present application are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar notations represent the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by referring to the drawings are exemplary only, for the purpose of explaining the present application, and should not be understood as a limitation of the present application.

[0040] In the description of the present application, it should be understood that, if the orientation description is involved, for example, the orientation or position relationship indicated by the up, down, front, back, left, right, etc. is based on the orientation or position relationship shown in the drawings, which is only for the purpose of describing the present application and simplifying the description, and therefore cannot be understood as a limitation of the present application, which indicates or implies that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation.

[0041] In the description of the present application, if the words such as several, more than, less than, exceed, above, below, within, etc. appear, wherein the meaning of several is one or more, the meaning of more than is two or more, more than, less than, exceed, etc. are understood as not including the number, and above, below, within, etc. are understood as including the number.

[0042] In the description of the present application, if the words such as first, second, etc. appear, they are only used for the purpose of distinguishing technical features, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features or the sequence of the indicated technical features.

[0043] In the description of the present application, unless otherwise explicitly limited, the words such as setting, mounting, connecting, etc. should be broadly understood, and the person skilled in the art can reasonably determine the specific meaning of the above words in the present application in combination with the specific content of the technical solution.

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

[0045] Specifically, the ultrasonic vibration assembly comprises a stator 210 and a piezoelectric ceramic sheet 220, the stator 210 is fixedly arranged below the base 100, and the piezoelectric ceramic sheet 220 is arranged on the top of the stator 210 (i.e. the side of the stator 210 facing the base 100), the transmission assembly comprises a gear ring 310, a rotor 320 and a planetary gear 330, the gear ring 310 is fixedly arranged below the stator 210 (i.e. the side of the stator 210 away from the base 100), the rotor 320 is rotatably connected to the base 100 and located in the gear ring 310, and the planetary gear 330 is rotatably arranged on the edge of the rotor 320 and meshes with the gear ring 310, the side of the stator 210 away from the base 100 abuts against the rotor 320, and the grinding disc 400 is arranged below the rotor 320 (i.e. the side of the rotor 320 away from the stator 210), wherein the planetary gear 330 is provided with an accommodation cavity 331 for accommodating a cylindrical roller a along the axial direction of the planetary gear 330, i.e. the accommodation cavity 331 penetrates through the planetary gear 330 along the axial direction of the planetary gear 330, the accommodation cavity 331 is configured to enable the curved surface of the accommodated cylindrical roller a to abut against the stator 210 and the grinding disc 400 at the same time, and at the same time, the accommodation cavity 331 is configured to allow the accommodated cylindrical roller a to rotate around its own axis relative to the planetary gear 330 and the planetary gear 330 to drive the cylindrical roller a to rotate synchronously.

[0046] 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 abutted against the stator 210 and the grinding disc 400, then the piezoelectric ceramic sheet 220 is connected to the preset signal, so that the piezoelectric ceramic sheet 220 generates a traveling wave, the traveling wave generated by the piezoelectric ceramic sheet 220 is amplified in amplitude by the stator 210 and then acts on the cylindrical roller a in the accommodating cavity 331 and the rotor 320. The traveling wave acting on the rotor 320 can drive the rotor 320 to rotate, so as to drive the planetary gear 330 to revolve around the axis of the gear ring 310, and then drive 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, the planetary gear 330 can rotate around its own axis due to the action of the gear ring 310, 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. In the process of processing, the stator 210 ultrasonically 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 application adopts a traveling wave to finish machining the cylindrical roller a, which is beneficial to improve the machining effect, and 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 gear ring 310 is not fixed, so as to improve the consistency of the material removal rate of the two ends of the cylindrical roller a.

[0047] Specifically, compared with a standing wave, the energy distribution of the traveling wave is uniform, and the surface defects of the cylindrical roller a caused by local energy concentration are reduced. In addition, the motion trajectory of the particles on the surface of the stator 210 is an elliptical space motion due to the generation of the traveling wave, compared with the case of using a standing wave to process, which only has a radial force, the particles of the traveling wave not only generate a radial force on the curved surface of the cylindrical roller a, but also generate a tangential force, so as to improve the material removal efficiency and machining precision.

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

[0049] It should be noted that the gear ring 310, the rotor 320 and the 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 with a plurality of spaced tooth slots 211, similar to the stator structure of an ultrasonic motor.

[0052] With reference to Figure 3 and Figure 6 In some embodiments, the transmission assembly includes at least two planetary gears 330, so that at least two cylindrical rollers a can be machined at the same time, thereby improving the machining efficiency.

[0053] It should be noted that in some embodiments, the grinding disc 400 is also used to carry a predetermined concentration of abrasive, and the abrasive carried by the grinding disc 400 generates ultrasonic cavitation effect under the action of ultrasonic vibration. Specifically, the bubbles in the liquid expand and reach a critical value and then burst, and the high-speed microjet generated after the bubble bursts can scour the surface of the cylindrical roller a, which can prevent the accumulation of grinding dust on the surface of the cylindrical roller a. At the same time, the water hammer effect caused by the high-speed microjet generated after the bubble bursts can accelerate the removal of the material on the surface of the cylindrical roller a. In addition, the strong impact effect caused by the high-speed microjet generated after the bubble bursts can compact the micro 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] In some embodiments, the abrasive is silicon carbide abrasive, of course, the abrasive can also be diamond abrasive or aluminum oxide abrasive, and other types of abrasive can also be used, which are not limited here.

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

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

[0057] It should be noted that in some embodiments, the ultrasonic machining device further includes a pre-tightening force adjusting assembly, which is arranged between the base 100 and the rotor 320. The pre-tightening force adjusting assembly is used to adjust the pre-tightening force between the rotor 320 and the stator 210, so as to facilitate the transmission effect of the transmission assembly.

[0058] With reference to Figures 5 to 8In some embodiments, the pre-tightening force adjusting assembly comprises a connecting shaft 510, an adjusting nut 520 and a thrust bearing 530, the middle portion of the rotor 320 is provided with a first mounting through hole 321, the middle portion of the stator 210 is provided with an avoiding through hole 212, the base 100 is provided with a second mounting through hole 110, the connecting shaft 510 is arranged in the first mounting through hole 321, the avoiding 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, the other 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 the other end of the connecting shaft 510 close to the base 100, and the thrust bearing 530 is arranged on the connecting shaft 510 and clamped between the adjusting nut 520 and the base 100. In use, the pre-tightening 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 pre-tightening force.

[0059] Specifically, the thrust bearing 530 is a thrust ball bearing, and of course, the thrust bearing 530 can also be a thrust roller bearing, which is not limited here.

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

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

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

[0063] Referring to Figure 6 In some embodiments, the connecting shaft 510 is provided with a radial bearing 550 arranged in the avoiding through hole 212, which is beneficial to improve the rotatability of the connecting shaft 510.

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

[0065] Referring to Figure 3 、 Figure 4 、 Figure 6 and Figure 8In some embodiments, the rotor 320 is provided with an arc-shaped groove 322, the planetary gear 330 is partially accommodated in the arc-shaped groove 322, the arc-shaped groove 322 extends through the rotor 320 along the axial direction of the rotor 320, and the rotor 320 is provided with a first limiting part 323 for limiting the planetary gear 330 from being separated from the arc-shaped groove 322 along the axial direction of the rotor 320, which is simple in structure and easy to implement.

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

[0067] With reference to Figure 1 , Figure 2 , Figure 4 , Figure 5 , Figure 6 and Figure 9 In some embodiments, the limiting structure includes a limiting ring 600 which is detachably arranged on the side of the ring gear 310 facing the base 100, the inner edge of the limiting ring 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 part 311 extending inwardly, which is simple in structure and easy to implement. Among them, the limiting ring 600 is detachably arranged on the side of the ring gear 310 facing the base 100, so as to facilitate the installation and disassembly of the rotor 320 and the planetary gear 330.

[0068] Specifically, the limiting ring 600 can be connected to the ring gear 310 by screws, or can be connected to the ring gear 310 by a clamping structure, which is not limited here.

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

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

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

[0072] With reference to Figure 1 , Figure 2 , Figure 5 , Figure 6 and Figure 10In some of the embodiments, a support 700 is arranged between the stator 210 and the base 100, one end of the support 700 is provided with a second connecting portion 710, the base 100, the second connecting portion 710 and the stator 210 are fixedly connected through a second fastener 800, the other end of the support 700 is provided with a third connecting portion 720, the gear ring 310 and the third connecting portion 720 are fixedly connected through a third fastener 900, and the structure is simple and easy to realize. In the embodiments, the size of the second connecting portion 710 along the axial direction of the gear ring 310 is less than the size of the third connecting portion 720 along the axial direction of the gear ring 310, so that the stator 210 and the gear ring 310 can be staggered along the axial direction of the gear ring 310.

[0073] Specifically, the second fastener 800 and the third fastener 900 are both screws. In the embodiments, the limiting ring 600 is fixedly arranged between the third connecting portion 720 and the gear ring 310 through the third fastener 900.

[0074] It should be noted that in some other embodiments, the second fastener 800 and the third fastener 900 can also be both pins, which are not limited herein.

[0075] In the description of the present specification, if the description of the terms such as “one embodiment”, “some embodiments”, “exemplary embodiment”, “example”, “specific example” and “some examples” is involved, it means that the specific features, structures, materials or characteristics described in connection with the embodiment or example are contained in at least one embodiment or example of the present application. In the present specification, the exemplary description of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can 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 can understand that various changes, modifications, replacements and variations can be made to the embodiments without departing from the principles and purposes of the present application, and the scope of the present application is defined by the claims and their equivalents.

Claims

1. An ultrasonic machining device characterized by comprising: The application relates to an ultrasonic machining device. The device comprises a base, an ultrasonic vibration assembly, a transmission assembly, a grinding disc and a pre-tightening force adjusting assembly. The ultrasonic vibration assembly comprises a stator and a piezoelectric ceramic sheet. The stator is fixed below the base. The piezoelectric ceramic sheet is arranged on the top of the stator. The transmission assembly comprises a gear ring, a rotor and a planetary gear.

2. The ultrasonic machining device according to claim 1, wherein The gear ring is fixed below the stator.

3. The ultrasonic machining device according to claim 2, wherein The rotor is rotatably connected to the base and located in the gear ring.

4. The ultrasonic machining device according to claim 3, wherein The planetary gear is rotatably arranged on the edge of the rotor and engaged with the gear ring.

5. The ultrasonic machining device according to claim 3, wherein The stator abuts against the rotor.

6. The ultrasonic machining device according to claim 1, wherein The grinding disc is arranged below the rotor.

7. The ultrasonic machining device according to claim 6, wherein The planetary gear is provided with a containing cavity along the axial direction of the planetary gear for containing a cylindrical roller.

8. The ultrasonic machining device according to claim 7, wherein The containing cavity can make the curved surface of the contained cylindrical roller abut against the stator and the grinding disc at the same time.

9. The ultrasonic machining device according to claim 1, wherein The containing cavity is configured to allow the contained cylindrical roller to rotate around the axis of the cylindrical roller relative to the planetary gear and the planetary gear can drive the cylindrical roller to rotate synchronously. The pre-tightening force adjusting assembly is arranged between the base and the rotor. The pre-tightening force adjusting assembly is used for adjusting the pre-tightening force between the rotor and the stator. The pre-tightening force adjusting assembly comprises a connecting shaft, an adjusting nut and a thrust bearing. The middle part of the rotor is provided with a first mounting through hole. The middle part of the stator is provided with an avoiding through hole. The base is provided with a second mounting through hole. The connecting shaft is simultaneously arranged in the first mounting through hole, the avoiding through hole and the second mounting through hole. One end of the connecting shaft close to the rotor is fixedly connected to the rotor. The other end of the connecting shaft close to the base is provided with a threaded connection structure. The adjusting nut is threadedly connected to the other end of the connecting shaft close to the base. The thrust bearing is arranged on the connecting shaft and clamped between the adjusting nut and the base. The other end of the connecting shaft close to the rotor has a first connecting part. The rotor and the first connecting part are fixedly connected through a first fastener. The connecting shaft is provided with a radial bearing located in the avoiding through hole. The edge of the rotor is provided with an arc-shaped groove. The planetary gear is partially arranged in the arc-shaped groove. The arc-shaped groove penetrates the rotor along the axial direction of the rotor. The rotor is formed with a first limiting part for limiting the planetary gear from separating from the arc-shaped groove along the axial direction of the rotor. The gear ring is provided with a limiting structure corresponding to the planetary gear. The limiting structure comprises a limiting ring piece. The limiting ring piece is detachably arranged on the side of the gear ring facing the base. The inner edge of the limiting ring piece protrudes from the inner edge of the gear ring. The inner edge of the side of the gear ring facing away from the base is provided with a second limiting part extending inwardly. The cross section of the containing cavity is a regular polygon.

10. The ultrasonic machining device according to claim 1, wherein A support is arranged between the stator and the base, one end of the support is provided with a second connecting part, the base, the second connecting part and the stator are fixedly connected through a second fastener, the other end of the support is provided with a third connecting part, the gear ring and the third connecting part are fixedly connected through a third fastener, the size of the second connecting part along the axial direction of the gear ring is less than the size of the third connecting part along the axial direction of the gear ring.

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