Multi-vibrator ultrasonic grinding device

Abstract

The invention discloses a multi-vibrator ultrasonic grinding device which comprises an amplification rod extending from a first end to a second end in the length direction. The plurality of piezoelectric vibrators are connected to the first end of the amplification rod, and the plurality of piezoelectric vibrators are arranged in parallel; the tool head is connected to the second end of the amplification rod; the grinding disc is arranged to rotate around the axis of the grinding disc; and the clamp is arranged between the tool head and the grinding disc, and a plurality of roller mounting through holes are formed in the clamp. The multiple piezoelectric vibrators are jointly connected to the amplification rod, the problem that the diameter of the amplification rod is smaller than one fourth of the wavelength of piezoelectric ceramic rings of the piezoelectric vibrators is solved, the diameter of the output end face of the amplification rod is large, workpieces with larger sizes can be machined, ultrasonic energy can directly act on the cylindrical rollers, multiple cylindrical rollers can be machined at a time, and the machining efficiency is improved. And the batch precision of cylindrical roller machining is ensured while the machining efficiency is improved.

Description

Technical Field

[0001] The invention is used in the field of bearing processing, and particularly relates to a multi-vibrator ultrasonic grinding device. Background Art

[0002] In the context of the rapid development of contemporary science and technology, the requirements for bearings in various aspects in the fields of precision machine tools, aerospace equipment, precision instruments, etc. are increasing day by day. However, bearing roller fatigue failure is the main failure form of bearings. Therefore, reducing roller fatigue failure has become the key to extending the life of bearings, and the development of high-quality rollers is urgent. The finishing of cylindrical roller surfaces includes centerless grinding, double-plane grinding and polishing, chemical mechanical finishing, electrochemical mechanical composite polishing, magnetic fluid grinding, etc. These methods have problems such as low production efficiency, complex manufacturing system, and high cost.

[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 drilling, ultrasonic grinding and ultrasonic welding. In recent years, ultrasonic assisted machining technology has been widely used because it can achieve good machining quality. The effect of ultrasonic hammering can modify the metal surface and improve the fatigue resistance of the metal surface.

[0004] In the prior art, ultrasonic hammering generally uses an ultrasonic transducer to perform ultrasonic rolling strengthening treatment on the cylindrical roller of the bearing through a horn, and transmits static pressure and ultrasonic impact vibration to the surface of the rotating cylindrical roller of the bearing, which produces an extrusion effect and causes a small elastic-plastic deformation of the metal material, thereby improving the fatigue strength of the cylindrical roller. However, when the lateral dimension of the horn is designed to be too large and there is material inhomogeneity, the influence of the Poisson effect will cause the ultrasonic horn to vibrate laterally in the lateral direction. Therefore, the diameter of the piezoelectric ceramic ring is limited to less than one-quarter of the wavelength, so that the diameter of most existing transducers is less than 50 mm, which ultimately results in a very small horn diameter that can only meet the surface processing of a single cylinder, low processing efficiency, and low batch accuracy of cylindrical roller processing. Summary of the invention

[0005] The purpose of the present invention is to solve at least one of the technical problems existing in the prior art and to provide a multi-vibrator ultrasonic grinding device.

[0006] The technical solution adopted by the present invention to solve the technical problem is:

[0007] A multi-vibrator ultrasonic grinding device, comprising:

[0008] An amplifier rod extending from a first end to a second end along a length direction;

[0009] A plurality of piezoelectric vibrators are connected to the first end of the amplifier rod, and the plurality of piezoelectric vibrators are arranged in parallel;

[0010] A tool head connected to the second end of the amplifier rod;

[0011] A grinding disc, arranged to rotate around its own axis;

[0012] A clamp is arranged between the tool head and the grinding disc, and the clamp is provided with a plurality of roller mounting through holes.

[0013] In combination with the above implementations, in some implementations, the piezoelectric vibrator includes a rear cover plate, a first piezoelectric ceramic ring, a first electrode sheet, a second piezoelectric ceramic ring, a second electrode sheet and a front end cover, and the rear cover plate, the first piezoelectric ceramic ring, the first electrode sheet, the second piezoelectric ceramic ring, the second electrode sheet and the front end cover are connected in series and fixed to the first end of the amplifier rod by bolts.

[0014] In combination with the above implementations, in some implementations, an ultrasonic generator is also included, and the first electrode sheets of the plurality of piezoelectric vibrators are connected to the positive electrode of the same ultrasonic generator, and the second electrode sheets of the plurality of piezoelectric vibrators are connected to the negative electrode of the same ultrasonic generator.

[0015] In combination with the above implementations, in certain implementations, the clamp deviates from the axis of the grinding disc, the clamp is limited by a swing arm, and can rotate around the axis of the clamp under the rotation of the grinding disc.

[0016] In combination with the above-mentioned implementations, in some implementations, the fixture includes a positioning plate, the thickness of the positioning plate is smaller than the thickness of the cylindrical roller, the positioning plate is provided with a plurality of roller mounting through holes, the roller mounting through holes penetrate the positioning plate along the thickness direction, the roller mounting through holes are circular holes in which the cylindrical roller can rotate around the axis of the roller mounting through holes.

[0017] In combination with the above implementations, in certain implementations, the clamp is provided with a plurality of roller mounting through holes, and the plurality of roller mounting through holes are distributed around the axis of the clamp itself.

[0018] In combination with the above implementations, in certain implementations, an annular retaining ring extending toward both sides along the thickness direction is provided on the edge of the positioning plate.

[0019] In combination with the above-mentioned implementations, in certain implementations, the tool head extends from a first end face to a second end face along a thickness direction, the first end face of the tool head is connected to the second end of the amplifier rod, the tool head has an outer peripheral surface extending obliquely from the first end face to the second end face, the outer peripheral surface is provided with a spiral groove extending from the first end face to the second end face, the multi-vibrator ultrasonic grinding device also includes a grinding liquid supply system for supplying grinding liquid to the cylindrical roller, and the grinding liquid supply system is provided with a liquid supply port extending to the first end face.

[0020] In combination with the above implementations, in certain implementations, the polishing liquid of the polishing liquid supply system uses silicon carbide polishing liquid.

[0021] In combination with the above implementations, in certain implementations, the amplifier rod is a stepped amplifier rod, and the diameter of the first end of the amplifier rod is greater than the diameter of the second end.

[0022] One of the above technical solutions has at least one of the following advantages or beneficial effects: The technical solution of the present invention uses a cylindrical bearing roller as a curved surface processing object, and the cylindrical roller is placed in the roller mounting through hole of the fixture, and is limited between the amplifier rod and the grinding disc by the fixture. The piezoelectric vibrator is used to convert electrical energy into mechanical energy of high-frequency vibration. Under ultrasonic high-frequency hammering, the surface of the cylindrical roller undergoes grain refinement, and residual compressive stress is generated to improve the fatigue strength of the cylindrical roller. In the technical solution of the present invention, multiple piezoelectric vibrators are used, and the piezoelectric vibrators are connected to the ultrasonic generator in parallel to ensure that the vibration modes of the multiple piezoelectric vibrators are consistent, avoiding vibration mode aliasing. The multiple piezoelectric vibrators are connected to the amplifier rod together to solve the limitation that the diameter of the amplifier rod is less than one-quarter wavelength of the piezoelectric ceramic ring of the piezoelectric vibrator, so that the output end face diameter of the amplifier rod is large, so that larger workpieces can be processed. The output end of the step amplifier rod directly acts on the cylindrical roller to avoid changes in the longitudinal vibration mode. Ultrasonic energy can not only act directly on the cylindrical roller, but also process multiple cylindrical rollers at one time, thereby improving the processing efficiency and ensuring the batch accuracy of cylindrical roller processing. At the same time, since the cylindrical roller is polished by the rotating action of the grinding disc, the present invention integrates the surface polishing and surface modification of the cylindrical roller, and can effectively improve the quality of the cylindrical roller.

[0023] Additional aspects and advantages of the present invention will be given in part in the following description and in part will be obvious from the following description, or will be learned through practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] The above and / or additional aspects and advantages of the present invention will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0025] Figure 1 It is a schematic diagram of the structure of an embodiment of the present invention;

[0026] Figure 2 It is an exploded schematic diagram of an embodiment of the present invention;

[0027] Figure 3 It is a schematic diagram of the fixture structure of an embodiment of the present invention;

[0028] Figure 4 It is a schematic diagram of the perpendicularity between the axis of a cylindrical roller and the friction force f it is subjected to in one embodiment of the present invention;

[0029] Figure 5 It is a schematic diagram of an embodiment of the present invention in which the axis of the cylindrical roller is neither perpendicular nor coincident with the friction force f;

[0030] Figure 6 It is a schematic diagram showing the coincidence of the axis of a cylindrical roller and the friction force f it is subjected to in one embodiment of the present invention;

[0031] Figure 7 It is a schematic diagram of decomposing the friction force f of a cylindrical roller into an axial component f1 and a radial component f2 according to an embodiment of the present invention;

[0032] Figure 8 It is a schematic diagram of a grinding liquid supply system supplying grinding liquid to a tool head according to an embodiment of the present invention. DETAILED DESCRIPTION

[0033] This section will describe in detail the specific embodiments of the present invention. The preferred embodiments of the present invention are shown in the accompanying drawings. The purpose of the accompanying drawings is to supplement the description of the text part of the specification with graphics, so that people can intuitively and vividly understand each technical feature and the overall technical solution of the present invention, but it cannot be understood as a limitation on the scope of protection of the present invention.

[0034] In the present invention, if directions (up, down, left, right, front and back) are described, it is only for the convenience of describing the technical solution of the present invention, and does not indicate or imply that the technical features referred to must have a specific orientation, be constructed and operate in a specific orientation. Therefore, it cannot be understood as a limitation of the present invention.

[0035] In the present invention, "several" means one or more, "multiple" means more than two, "greater than", "less than", "exceed" and the like are understood to exclude the number itself; "above", "below", "within" and the like are understood to include the number itself. In the description of the present invention, if there is a description of "first" or "second", it is 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 implicitly indicating the order of the indicated technical features.

[0036] In the present invention, unless otherwise clearly defined, the words "set", "install", "connect" and the like should be understood in a broad sense, for example, they can be directly connected or indirectly connected through an intermediate medium; they can be fixedly connected or detachably connected or integrally formed; they can be mechanically connected or electrically connected or able to communicate with each other; they can be the internal connection of two elements or the interaction relationship between two elements. Those skilled in the art can reasonably determine the specific meanings of the above words in the present invention in combination with the specific content of the technical solution.

[0037] See also Figure 1 , Figure 2The embodiment of the present invention provides a multi-vibrator ultrasonic grinding device, including an amplifier rod 4, a plurality of piezoelectric vibrators, a tool head 19, a grinding disc 1 and a fixture 3, wherein the amplifier rod 4 extends from the first end to the second end along the length direction; the plurality of piezoelectric vibrators are connected to the first end of the amplifier rod 4, and the piezoelectric vibrators are used to realize the conversion of electrical energy into mechanical energy of overfrequency vibration, and the amplifier rod 4 can amplify the ultrasonic energy from the plurality of piezoelectric vibrators, and the plurality of piezoelectric vibrators are arranged in parallel to ensure that the vibration modes of the plurality of piezoelectric vibrators are consistent, thereby avoiding vibration mode aliasing; the tool head 19 is connected to the second end of the amplifier rod 4, and is used to transmit the vibration of the amplifier rod 4 to the cylindrical roller 2; the grinding disc 1 is arranged to rotate around the axis of the grinding disc 1; the fixture 3 is arranged between the tool head 19 and the grinding disc 1, and the fixture 3 is provided with a plurality of roller mounting through holes. The grinding disc 1 can be driven by a motor, and the rotation speed of the grinding disc 1 can be adjusted. The cylindrical roller 2 is placed between the tool head 19 and the grinding disc 1. When the grinding disc 1 rotates, a friction force is applied to the cylindrical roller 2, so that the cylindrical roller 2 can rotate around its own axis.

[0038] The technical solution of the present invention uses a cylindrical bearing roller as a curved surface processing object. The cylindrical roller 2 is placed in the roller mounting through hole of the fixture 3 and is limited between the tool head 19 and the grinding disc 1 by the fixture 3. The piezoelectric vibrator is used to convert electrical energy into mechanical energy of high-frequency vibration. Under ultrasonic high-frequency hammering, the surface of the cylindrical roller 2 undergoes grain refinement and generates residual compressive stress to improve the fatigue strength of the cylindrical roller 2. In the technical solution of the present invention, multiple piezoelectric vibrators are used, and the piezoelectric vibrators are connected to the ultrasonic generator in parallel to ensure that the vibration modes of the multiple piezoelectric vibrators are consistent, thereby avoiding vibration mode aliasing. The multiple piezoelectric vibrators are connected to the amplifier rod 4 in common to solve the problem that the amplifier rod 4 is limited by the diameter of the piezoelectric ceramic ring of the piezoelectric vibrator being less than a quarter of the wavelength, so that the output end face diameter of the amplifier rod 4 is large, thereby processing larger workpieces, and the output end of the step amplifier rod 4 directly acts on the cylindrical roller 2 to avoid changes in the longitudinal vibration mode. Ultrasonic energy can not only act directly on the cylindrical roller 2, but also process multiple cylindrical rollers 2 at one time, thereby improving the processing efficiency and ensuring the batch accuracy of the cylindrical roller 2. At the same time, since the cylindrical roller 2 is polished by the rotating action of the grinding disc 1, the present invention integrates the surface polishing and surface modification of the cylindrical roller 2, and can efficiently improve the quality of the cylindrical roller 2.

[0039] In some embodiments, see Figure 1 , Figure 2The piezoelectric vibrator comprises a rear cover plate (13, 10), a first piezoelectric ceramic ring (9, 14), a first electrode sheet (8, 15), a second piezoelectric ceramic ring (7, 16), a second electrode sheet (6, 17) and a front end cover (5, 18); the rear cover plate (13, 10), the first piezoelectric ceramic ring (9, 14), the first electrode sheet (8, 15), the second piezoelectric ceramic ring (7, 16), the second electrode sheet (6, 17) and the front end cover (5, 18) are connected in series and fixed to the first end of the amplifier rod 4 through bolts (11, 12). The piezoelectric vibrator realizes the conversion of electrical energy into mechanical energy of super-frequency vibration. After power is turned on, the inverse piezoelectric effect of the first piezoelectric ceramic ring (9, 14) and the second piezoelectric ceramic ring (7, 16) is used to generate periodic mechanical vibration. The ultrasonic vibration energy generated by the multiple piezoelectric vibrators is simultaneously transmitted to the amplifier rod 4 through the front cover plate respectively. The amplifier rod 4 can amplify the ultrasonic energy from the two piezoelectric vibrators. Because the ultrasonic energy remains unchanged within the entire length of the step amplifier rod 4, the energy density increases as the cross-section decreases, and the output amplitude of the amplifier rod 4 is relatively large, which is beneficial to the material removal and surface modification of the cylindrical roller 2.

[0040] The multi-vibrator ultrasonic grinding device also includes an ultrasonic generator, wherein the first electrode sheets (8, 15) of the multiple piezoelectric vibrators are connected to the positive electrode of the same ultrasonic generator, and the second electrode sheets (6, 17) of the multiple piezoelectric vibrators are connected to the negative electrode of the same ultrasonic generator, so as to ensure that the vibration modes of the multiple piezoelectric vibrators are consistent and avoid vibration mode aliasing.

[0041] In some embodiments, see Figure 1 , Figure 2 The fixture 3 deviates from the axis of the grinding disc 1. The fixture 3 is limited by the swing arm and can rotate around the axis of the fixture 3 under the rotation of the grinding disc 1. The grinding disc 1 is driven by a motor, and the rotation speed of the grinding disc 1 is adjustable. The cylindrical roller 2 is placed between the tool head 19 and the grinding disc 1. When the grinding disc 1 rotates, a friction force is applied to the cylindrical roller 2, so that the cylindrical roller 2 can rotate around its own axis.

[0042] Among them, see Figure 3The fixture 3 includes a positioning plate 20, the thickness of the positioning plate 20 is less than the thickness of the cylindrical roller 2, and the positioning plate 20 is provided with a plurality of roller mounting through holes 21, which penetrate the positioning plate 20 in the thickness direction, and the roller mounting through holes 21 are circular holes in which the cylindrical roller 2 can rotate around the axis of the roller mounting through holes 21. The fixture 3 is provided with a plurality of roller mounting through holes 21, and the plurality of roller mounting through holes 21 are distributed around the axis of the fixture 3. The fixture 3 is limited by the swing arm on the grinder, and due to the rotation of the grinding disc 1, the fixture 3 can rotate around its own axis. A plurality of circular roller mounting holes 21 are evenly distributed on the fixture 3, and a cylindrical roller 2 is placed on each circular roller mounting hole 21. When the grinding disc 1 rotates, a friction force is applied to the cylindrical roller 2, so that the cylindrical roller 2 can rotate around its own axis. At the same time, since the circular roller mounting holes 21 are opened on the fixture 3, the cylindrical roller 2 is not constrained from rotating parallel to the grinding disc 1, that is, the cylindrical roller 2 can also rotate parallel to the grinding disc 1 under the push of friction force, so that the end of the single cylindrical roller 2 originally far away from the center of the grinding disc 1 gradually approaches the center of the grinding disc 1, and then moves away from the center of the grinding disc 1, and continues to be replaced in sequence, thereby solving the problem of inconsistent material removal rates at different parts of a single cylindrical roller 2.

[0043] See also Figure 4-Figure 7 There are three states of cylindrical roller 2 during the grinding process: (1) the axis of cylindrical roller 2 is perpendicular to the friction force f, such as Figure 4 As shown, at this time, the cylindrical roller 2 rotates around its own axis under the action of the friction force f; (2) The axis of the cylindrical roller 2 is neither perpendicular nor coincident with the friction force f. Figure 5 As shown in FIG6 , at this time, the friction force f is decomposed into an axial component f1 and a radial component f2. At this time, the cylindrical roller 2 rotates around its own axis under the action of the friction component f2; (3) The axis of the cylindrical roller 2 coincides with the friction force f, as shown in FIG6 . At this moment, the cylindrical roller 2 cannot rotate around its own axis. However, since the fixture 3 can rotate around O2 under the drive of friction and the positioning of the grinder swing arm, the fixture 3 drives the cylindrical roller 2 to rotate around O2 at a slight angle, as shown in FIG6 . Figure 7 As shown, the friction force f is decomposed into the axial force f1 and the radial force f2. The cylindrical roller 2 rotates around its own axis under the action of the friction force f2, that is, it returns to state (1). It can be seen that except for the moment when the axis of the cylindrical roller 2 coincides with the friction force f, the cylindrical roller 2 can always rotate around its own axis.

[0044] The cylindrical roller 2 is placed between the tool head 19 and the grinding disc 1. Under the ultrasonic high-frequency hammering, the surface of the cylindrical roller 2 undergoes grain refinement and generates residual compressive stress to improve the fatigue strength of the cylindrical roller 2. At the same time, the cylindrical roller 2 is polished due to the rotation of the grinding disc 1. Therefore, the present invention integrates the surface polishing and surface modification of the cylindrical roller 2, and can effectively improve the quality of the cylindrical roller 2.

[0045] In some embodiments, see Figure 4 The edge of the positioning plate 20 is provided with an annular retaining ring 22 extending to both sides along the thickness direction. The cross section of the fixture 3 is H-shaped. The outer annular retaining ring 22 is used to support the positioning plate 20 on the one hand, so that it can better position the cylindrical roller 2. On the other hand, it can also cooperate with the swing arm on the grinder to limit the position, and can realize rotation around its own axis in the cooperation with the grinding disc 1. In addition, the annular retaining ring 22 can also flow the grinding liquid into the roller installation through hole 21 to improve the grinding effect.

[0046] In some embodiments, see Figure 1 , Figure 2 , Figure 8 The tool head 19 extends from the first end face 23 to the second end face 24 along the thickness direction. The first end face 23 of the tool head 19 is connected to the second end of the amplifier rod 4. The tool head 19 has an outer peripheral surface 25 extending obliquely from the first end face 23 to the second end face 24. The cross-section of the tool head 19 is an inverted trapezoid. The outer peripheral surface 25 of the tool head 19 is provided with a spiral groove 26 extending from the first end face 23 to the second end face 24. The multi-vibrator ultrasonic grinding device also includes a grinding liquid supply system for supplying grinding liquid to the cylindrical roller 2. The grinding liquid supply system is provided with a liquid supply port extending to the first end face 23 to play a cooling role. Due to the structural characteristics of the tool head 19, the grinding liquid can be evenly distributed on each roller, and the ultrasonic vibration drives the free abrasive particles to impact the roller workpiece surface.

[0047] During the processing, a certain concentration of grinding fluid is added, such as Figure 8 As shown, the grinding liquid drips onto the tool head 19, and the tool head 19 has a spiral groove 26, which not only makes the abrasive fall evenly on the cylindrical roller 2, but also the spiral groove 26 structure converts part of the longitudinal vibration energy into torsional vibration. Due to the ultrasonic cavitation effect, the bubbles in the liquid expand to a critical value and then rupture. The high-speed micro jet generated after the rupture flushes the surface of the cylindrical roller 2 to prevent the accumulation of grinding chips on the surface of the cylindrical roller 2. At the same time, the water hammer effect brought by the high-speed micro jet can accelerate the material removal on the workpiece surface, and its strong impact will compact the microscopic surface of the workpiece, which is beneficial to the surface grain refinement to improve the fatigue strength of the cylindrical roller 2. Under the multiple effects of grinding and polishing of the grinding disc 1, ultrasonic hammering and ultrasonic cavitation effect, the surface polishing and surface modification of the cylindrical roller 2 are integrated, which can effectively improve the quality of the cylindrical roller 2.

[0048] In some embodiments, the polishing liquid of the polishing liquid supply system is silicon carbide polishing liquid.

[0049] In some embodiments, the amplifier rod 4 adopts a step amplifier rod, and the diameter of the first end of the amplifier rod 4 is larger than the diameter of the second end. The step amplifier rod can amplify the ultrasonic energy from multiple piezoelectric vibrators. Because the ultrasonic energy remains unchanged throughout the entire length of the step amplifier rod, the energy density increases as the cross-section decreases, and the output amplitude of the step amplifier rod is larger, which is beneficial to material removal and surface modification of the cylindrical roller 2.

[0050] In the description of this specification, the description with reference to the terms "example", "embodiment" or "some embodiments" 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 invention. 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 can be combined in any one or more embodiments or examples in a suitable manner.

[0051] Of course, the invention is not limited to the above-mentioned embodiments, and those skilled in the art may make equivalent modifications or substitutions without violating the spirit of the invention, and these equivalent modifications or substitutions are all included in the scope defined by the claims of this application.

Claims

1. A multi-vibrator ultrasonic grinding device, characterized in that: include: An amplifier rod extending from a first end to a second end along a length direction; A plurality of piezoelectric vibrators are connected to the first end of the amplifier rod, and the plurality of piezoelectric vibrators are arranged in parallel; A tool head connected to the second end of the amplifier rod; A grinding disc, arranged to rotate around its own axis; A clamp is arranged between the tool head and the grinding disc, and the clamp is provided with a plurality of roller mounting through holes.

2. The multi-vibrator ultrasonic grinding device according to claim 1, characterized in that: The piezoelectric vibrator includes a rear cover plate, a first piezoelectric ceramic ring, a first electrode sheet, a second piezoelectric ceramic ring, a second electrode sheet and a front end cover. The rear cover plate, the first piezoelectric ceramic ring, the first electrode sheet, the second piezoelectric ceramic ring, the second electrode sheet and the front end cover are connected in series and fixed to the first end of the amplifier rod by bolts.

3. The multi-vibrator ultrasonic grinding device according to claim 2, characterized in that: It also includes an ultrasonic generator, wherein the first electrode sheets of the plurality of piezoelectric vibrators are connected to the positive electrode of the same ultrasonic generator, and the second electrode sheets of the plurality of piezoelectric vibrators are connected to the negative electrode of the same ultrasonic generator.

4. The multi-vibrator ultrasonic grinding device according to claim 1, characterized in that: The clamp deviates from the axis of the grinding disc, is limited by a swing arm, and can rotate around the axis of the clamp under the rotation of the grinding disc.

5. The multi-vibrator ultrasonic grinding device according to claim 4, characterized in that: The fixture includes a positioning plate, the thickness of which is smaller than that of the cylindrical roller. The positioning plate is provided with a plurality of roller mounting through holes, which penetrate the positioning plate along the thickness direction. The roller mounting through holes are circular holes in which the cylindrical roller can rotate around the axis of the roller mounting through holes.

6. The multi-vibrator ultrasonic grinding device according to claim 5, characterized in that: The clamp is provided with a plurality of roller mounting through holes, and the plurality of roller mounting through holes are distributed around the axis of the clamp itself.

7. The multi-vibrator ultrasonic grinding device according to claim 5, characterized in that: The edge of the positioning plate is provided with an annular retaining ring extending to both sides along the thickness direction.

8. The multi-vibrator ultrasonic grinding device according to claim 1, characterized in that: The tool head extends from the first end face to the second end face along the thickness direction, the first end face of the tool head is connected to the second end of the amplifier rod, the tool head has an outer peripheral surface extending obliquely from the first end face to the second end face, and the outer peripheral surface is provided with a spiral groove extending from the first end face to the second end face. The multi-vibrator ultrasonic grinding device also includes a grinding liquid supply system for supplying grinding liquid to the cylindrical roller, and the grinding liquid supply system is provided with a liquid supply port extending to the first end face.

9. The multi-vibrator ultrasonic grinding device according to claim 8, characterized in that: The grinding liquid of the grinding liquid supply system adopts silicon carbide grinding liquid.

10. The multi-vibrator ultrasonic grinding device according to claim 1, characterized in that: The amplifier rod is a stepped amplifier rod, and the diameter of the first end of the amplifier rod is greater than the diameter of the second end.

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