Ultrasonic auxiliary grinding device for converting small-size bending into vertical direction and using method

Abstract

The invention discloses a small-size bending conversion vertical direction ultrasonic auxiliary grinding device which comprises a transducer rear cover plate, piezoelectric ceramics and an ultrasonic amplitude-change pole, bending vibration ultrasonic transducers comprise transducer rear cover plates, piezoelectric ceramics and ultrasonic amplitude-change poles, and the left side and the right side of a vibration conversion body are each provided with one bending vibration ultrasonic transducer. The vibration conversion body fixes the bottom plate through the shell, the bottom plate is fixed to a grinding machine workbench, the thin end face of the ultrasonic amplitude-change pole is fixedly connected with the vibration conversion body, front-back grooves are formed in the ultrasonic amplitude-change pole in the front-back direction, vertical grooves are formed in the ultrasonic amplitude-change pole in the vertical direction, and the front-back grooves and the vertical grooves are alternately distributed in the axis direction of the amplitude-change pole. Compared with a traditional vertical ultrasonic vibration device, the small-size auxiliary grinding device capable of converting from bending to vertical direction to ultrasonic vibration has the advantages that the size of the device in the vertical direction is greatly reduced, the application range of ultrasonic vibration auxiliary grinding is widened, and the grinding force and the grinding temperature are reduced.

Description

Technical Field

[0001] The invention relates to a small-size bending conversion vertical ultrasonic assisted grinding device and a use method, which is used for applying vertical ultrasonic vibration to a workpiece during grinding to achieve vertical ultrasonic vibration assisted grinding, and belongs to the technical field of ultrasonic processing. Background Art

[0002] Grinding has always played a vital role in the mechanical processing industry, providing strong support for the development of the manufacturing industry. During the grinding process, the high-speed rotation of the grinding wheel and the scratches between the workpiece surface cause too many cracks on the workpiece surface, resulting in low surface accuracy of the workpiece. With the development of new technologies, the combination of ultrasonic vibration technology and traditional grinding can greatly improve the workpiece processing accuracy and improve the workpiece surface quality. Since the ultrasonic vibration device needs to be connected to the grinding machine, the convenience and stability of the ultrasonic vibration device will greatly affect the production efficiency. For example, the patent application document with application number CN202120960417.8 discloses a rotary ultrasonic grinding device that is easy to use. Three hinge blocks are installed at one end of the workpiece fixing rod. Each hinge block can adjust the angle of the grinding body mechanism, thereby changing the position of the grinding workpiece, which can adapt to different usage requirements and greatly improve practicality. The patent application document with application number CN201821188110.5 discloses a gear ultrasonic grinding device. It includes a rotating hollow shaft and a fixed base, a through hole is set on the upper part of the fixed base, one end of the rotating hollow shaft is connected to the fixed base, and the other end is fixed to the flange of the ultrasonic vibration amplitude transformer. The small end of the amplitude transformer is connected to the large end of the workpiece and connected to the ultrasonic generator through electrical transmission. The device can greatly improve the machining accuracy of gear grinding and improve the fatigue resistance of gears. The patent application document with application number CN201721269746.8 discloses an ultrasonic vibration grinding device. The device includes an ultrasonic spindle, an ultrasonic grinding head is connected to the ultrasonic spindle and a workpiece cleaning device is placed underneath, which can more simply and efficiently clean the residual grinding debris on the workpiece, greatly improving the life of the grinding tool. The patent application document with application number CN202220859768.4 discloses an ultrasonic assisted grinding device with a stepped horn, in which the horn of the device makes an interference fit between the upper cylinder and the flange, the diameter of the lower cylinder is smaller than that of the upper cylinder, the axes of the two cylinders are on the same straight line, and the lower end face of the cylinder is connected to the grinding wheel, realizing a stepped horn-grinding wheel integrated design, which can realize intermittent grinding, greatly improve the problem of grinding heat accumulation during the grinding process while reducing the grinding force. However, the size of the above-mentioned ultrasonic vibration assisted grinding device is limited by the length of the ultrasonic wave, resulting in the problem of excessive size and a single vibration mode, and cannot be applied to vertical ultrasonic vibration assisted grinding. Summary of the invention

[0003] The present invention is directed to a grinding wheel radial vibration ultrasonic vibration assisted grinding process, a small-size bending conversion vertical ultrasonic assisted grinding device and a method of use. The bending ultrasonic vibration is converted into vertical ultrasonic vibration by a vibration converter, thereby solving the problem that the ultrasonic device is too large in the vertical direction. At the same time, rectangular through grooves are regularly distributed on the surface of the ultrasonic horn and the vibration converter to extend the ultrasonic transmission distance, shorten the size of the ultrasonic vibration device, and further reduce the size of the ultrasonic vibration device.

[0004] The technical solution of the present invention is implemented as follows: a small-size bending conversion vertical ultrasonic auxiliary grinding device comprises a transducer rear cover plate 1, a piezoelectric ceramic 2, an ultrasonic horn 3, a bottom plate 4, and a vibration converter 5. The bending vibration ultrasonic transducer comprises a transducer rear cover plate 1, a piezoelectric ceramic 2, and an ultrasonic horn 3. A bending vibration ultrasonic transducer is installed in the left side center area 501 and the right side center area 502 of the vibration converter 5. A shell 6 is fixedly installed on the front and back of the vibration converter 5. The bottom plate 4 is fixedly installed on the lower end of the shell 6. The bottom plate 4 is fixed on the grinding machine workbench. The transducer rear cover plate 1, the piezoelectric ceramic 2, and the rough end surface of the ultrasonic horn 3 are fixedly connected in sequence. The thin end surface of the ultrasonic horn 3 is fixedly connected to the vibration converter 5.

[0005] The vibration converter 5 is a hollow rectangular structure, and the ultrasonic horn 3 is a truncated cone structure. The ultrasonic horn 3 is provided with front and rear grooves 302 along the front and rear directions and vertical grooves 303 in the vertical direction. Each front and rear groove 302 and vertical groove 303 has grooves of the same size on the symmetry plane of the horn axis, and the front and rear grooves 302 and vertical grooves 303 are alternately arranged along the horn axis.

[0006] Preferably, the vibration converter 5 is square in front and back, with sides of 50 mm each, and a thickness of 20 mm. The rectangular parallelepiped is provided with a plurality of center through grooves 504, upper through grooves 505, and lower through grooves 506 along the front and back directions. The center through groove 504 is 40 mm high and 4 mm wide, and the heights of the upper through grooves 505 and the lower through grooves 506 are 20 mm and 4 mm wide. Three center through grooves 504 are evenly distributed along the left and right directions, and upper through grooves 505 and lower through grooves 506 are provided between the center through grooves 504. The thickness of the vibration converter 5 between the center through groove 504 and the upper through groove 505 and the lower through groove 506 is 5 mm, and the thickness of the vibration converter 5 between the upper through groove 505 and the lower through groove 506 is 10 mm.

[0007] Preferably, the distance between adjacent front and rear grooves 302 and vertical grooves 303 is 8 mm, every two front and rear grooves 302 symmetrical along the axis of the transformer are a group, and every two vertical grooves 303 symmetrical along the axis of the transformer are a group. Along the direction from the thin end surface 301 to the thick end surface 304 of the ultrasonic transformer 3, the distance between the bottom surfaces of each group of grooves gradually increases. The distance between a group of front and rear grooves 302 on one side of the thin end surface 301 is 5 mm, which is equal to half the diameter of the thin end surface 301 of the ultrasonic transformer 3; the distance between a group of front and rear grooves 302 on one side of the thick section 304 is 9 mm, which is equal to half the diameter of the thick end of the ultrasonic transformer 3, and the distance between the middle group of front and rear grooves 302 is 7 mm.

[0008] Preferably, the center distance of the front and rear grooves 302 on one side of the thin end face 301 is 7 mm from the thin end face, the center distance of the front and rear grooves 302 on one side of the rough section 304 is 7 mm from the rough end face, a vertical groove 303 is arranged between two adjacent front and rear grooves 302, and the distances of the two groups of front and rear grooves 302 from the thin end face to the rough section are 6 mm and 8 mm respectively.

[0009] Preferably, the material of the piezoelectric ceramic 2 is lead zirconate titanate, with an outer diameter of 18 mm, an inner diameter of 8 mm, and a thickness of 5 mm. A group of piezoelectric ceramics consists of 4 pieces, which are arranged concentrically in sequence. The outer diameter of the rear cover plate is the same as the outer diameter of the piezoelectric ceramic. The diameter of the coarse end face of the ultrasonic amplitude transformer 3 is equal to the diameter of the piezoelectric ceramic, both of which are 18 mm. The diameter of the thin end face 301 of the ultrasonic amplitude transformer 3 is 10 mm and the length is 48 mm.

[0010] Preferably, the front and rear surfaces of the vibration converter 5 have four M5 threaded through holes, which are symmetrically distributed. The first threaded hole is located at the center position between the upper end of the first center through groove 504 and the upper surface, the second threaded hole is located at the center position between the lower end of the first center through groove 504 and the lower surface, the third threaded hole is located at the center position between the upper end of the fifth center through groove 504 and the upper surface, and the fourth threaded hole is located at the center position between the lower end of the fifth axis center through groove 504 and the lower surface. The above four positions are vibration nodes of the vibration converter, which are used to prevent ultrasonic vibration from being transmitted to the outer shell 6. The left center area 501 and the right center area 502 of the vibration converter 5 are both provided with two M6 threaded blind holes for installing the ultrasonic horn 3.

[0011] Preferably, the workpiece material is GH4169 high temperature alloy, with a length of 16 mm, a width of 10 mm, and a thickness of 2 mm, and is glued to the central area of ​​the upper surface of the vibration converter.

[0012] Preferably, the length of the shell 6 is 55 mm, the width is 50 mm, and the surface of the shell 6 is provided with 4 circular holes with a diameter of 5.5 mm at positions corresponding to the threaded holes of the vibration converter. The shell 6 is fixed to the front and rear surfaces of the vibration converter 5 by bolts, and there is a circular hole with a diameter of 35 mm at the center of the shell 6. The method for using the small-size bending conversion vertical ultrasonic assisted grinding device is to paste the workpiece at the center position 503 of the upper surface of the vibration converter, turn on the ultrasonic power supply connected to the piezoelectric ceramic 2, and the two piezoelectric ceramics generate bending ultrasonic vibrations of a fixed frequency, driving the ultrasonic horn 3 to generate second-order bending ultrasonic vibrations. The bending vibrations of the two ultrasonic horns are in the same phase, and after the bending conversion vertical vibration conversion of the vibration converter 5, a one-dimensional radial ultrasonic vibration is formed at the center position of the upper surface of the vibration converter 5, so as to realize the vertical ultrasonic vibration assisted grinding of the workpiece 8.

[0013] Beneficial effects:

[0014] (1) The present invention overcomes the drawback that the structural parameters of the existing ultrasonic vibration-assisted grinding device are limited by the ultrasonic wave length. By regularly distributing grooves on the ultrasonic transducer, multiple refractions occur during the ultrasonic wave transmission process, thereby extending the transmission distance, reducing the size of the ultrasonic amplitude transformer, and achieving small size control of large wavelength.

[0015] (2) The present invention uses a method of regularly distributed rectangular through grooves to achieve vertical ultrasonic vibration conversion in bending conversion, thereby reducing the size of the ultrasonic vibration auxiliary device along the vertical direction and increasing the application range of the ultrasonic vibration auxiliary grinding device.

[0016] (3) The workpiece of the present invention is pasted on the central area of ​​the upper surface of the vibration converter, and is applicable to a wide range of workpiece materials, which can meet the radial ultrasonic vibration assisted grinding test requirements of various materials.

[0017] The advantage of the present invention is that the size of the ultrasonic vibration device in the vertical direction of vertical ultrasonic vibration assisted grinding is greatly reduced by the vertical direction conversion of the bending conversion, which solves the problem that the ultrasonic vibration device cannot be installed on the grinding machine due to the short vertical motion stroke of the grinder. At the same time, compared with horizontal ultrasonic vibration, the grinding force and grinding temperature of the ultrasonic vibration in the vertical direction formed by the small-sized bending conversion vertical direction conversion ultrasonic vibration assisted grinding device of the present invention are greatly reduced. Wang Xuezhi of Shenyang Aerospace University disclosed the grinding force data of SiCf / SiC assisted by ultrasonic vibration in the journal Tool Technology (Engineering Technology I) in the 3rd issue of 2023, and the maximum values ​​of tangential and normal grinding forces per unit width were 3.02N and 3.35N. A small-sized bending conversion vertical direction conversion ultrasonic vibration assisted grinding device proposed by the present invention was used to carry out grinding tests under the same conditions, and the maximum value of the tangential grinding force per unit width was 2.56N, and the maximum value of the normal grinding force per unit width was 2.36N. Qiao Jiaping of Harbin Institute of Technology published the research results of grinding temperature and grinding force of zirconia ceramics in the journal Aviation Manufacturing Technology, No. 8, 2020. It was found that when the ultrasonic amplitude was 4.66μm, compared with traditional grinding, the normal grinding force decreased by 34% and the grinding temperature decreased by 34.5% at most. When a small-sized bending-to-vertical-direction ultrasonic vibration-assisted grinding device proposed in the present invention was used to grind zirconia ceramics, the normal grinding force decreased by 42% at most. The grinding temperature decreased by 39% at most, indicating that the grinding force and grinding temperature of the workpiece can be significantly reduced during grinding using the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 The invention discloses an installation relationship between a small-sized bending conversion vertical direction conversion ultrasonic vibration auxiliary grinding device and a grinding wheel;

[0019] Figure 2 It is a schematic diagram of the overall structure of the present invention;

[0020] Figure 3 It is a schematic diagram of the bending conversion vertical direction vibration conversion method of the present invention;

[0021] Figure 4 It is a schematic diagram of the three-dimensional structure of the vibration converter in the present invention;

[0022] Figure 5 It is a schematic diagram of regularly distributed rectangular through grooves on the surface of the vibration converter in the present invention;

[0023] Figure 6 It is a schematic diagram of the ultrasonic horn in the present invention;

[0024] Figure 7 It is a three-view drawing of the ultrasonic horn in the present invention;

[0025] Figure 8 The vibration mode used for the bending conversion and vertical vibration conversion of the vibration converter in the present invention;

[0026] Fig. 9 is the second-order bending vibration mode of the ultrasonic horn in the present invention;

[0027] In the figure: 1. transducer rear cover; 2. piezoelectric ceramics; 3. ultrasonic amplitude transformer; 4. bottom plate; 5. vibration converter; 6. housing; 7. bolt; 8. workpiece; 9. grinding wheel. DETAILED DESCRIPTION

[0028] The following is a detailed description of a small-sized bending and vertical conversion ultrasonic vibration assisted grinding device and a method of use of the present invention in conjunction with the embodiments and drawings.

[0029] Example 1

[0030] like Figure 1-9 As shown, a small-sized bending-to-radius conversion ultrasonic vibration assisted grinding device includes a transducer rear cover plate 1, a piezoelectric ceramic 2, an ultrasonic horn 3, a bottom plate 4, a vibration converter 5, a housing 6, and a bolt 7. Figure 3 The left-right direction is along the ultrasonic horn 3, the vertical direction is perpendicular to the ultrasonic horn 3, and the front-back direction is perpendicular to the paper surface.

[0031] The transducer rear cover plate 1, piezoelectric ceramics 2 and ultrasonic horn 3 form a bending vibration ultrasonic transducer, and two groups of bending vibration ultrasonic transducers are respectively installed in the left side center area 501 and the right side center area 502 of the vibration converter 5. The workpiece 8 is pasted on the center position 503 of the upper surface of the vibration converter 5. The housing 6 is fixedly installed on the front and back of the vibration converter 5, and the bottom plate 4 is fixedly installed on the lower end of the housing 6. The bottom plate 4 is fixed on the grinder workbench, and the piezoelectric ceramics and the ultrasonic power supply are connected through a wire. Turn on the ultrasonic power supply to make the two groups of piezoelectric ceramics 2 generate bending ultrasonic vibrations, and excite the thin end surface 301 of the ultrasonic horn 3 to generate bending ultrasonic vibrations. The vibration converter 5 converts the bending ultrasonic vibrations, so that the center position 503 of the upper surface of the vibration converter 5 generates vertical ultrasonic vibrations. The workpiece 8 is pasted on the center position 503 of the upper surface of the vibration converter 5 to realize the vertical ultrasonic vibration of the workpiece, and cooperates with the horizontal and vertical feeding motions and the grinding wheel rotation motion provided by the grinder to realize one-dimensional vertical ultrasonic vibration assisted grinding.

[0032] In the embodiment, the material of the piezoelectric ceramic 2 is lead zirconate titanate, with an outer diameter of 18 mm, an inner diameter of 8 mm, and a thickness of 5 mm. A group of piezoelectric ceramics has 4 pieces, which are arranged concentrically in sequence. One end of the piezoelectric ceramic 2 is fixedly connected to the rear cover plate 1, which is made of 45 steel and has an outer diameter the same as that of the piezoelectric ceramic. The other end of the piezoelectric ceramic is connected to the thick end face 304 of the ultrasonic horn 3. The diameter of the thick end face of the ultrasonic horn 3 is equal to the diameter of the piezoelectric ceramic, both of which are 18 mm. The diameter of the thin end face 301 is 10 mm and the length is 48 mm. Figure 7 shown.

[0033] In the embodiment, the ultrasonic horn 3 is in the shape of a truncated cone as a whole. Figure 6 and Figure 7 As shown. The rough end face 304 is connected to the piezoelectric ceramic 2, the thin end face 301 is connected to the vibration converter 5, and the circumferential surface of the ultrasonic horn 3 is provided with a flat-bottomed groove. The flat-bottomed grooves are divided into two categories. The first category is the front and rear grooves 302 opened along the front and back, and the second category is the vertical grooves 303 opened along the vertical direction. Each front and rear groove 302 and the vertical groove 303 have grooves of the same size on the symmetric surface of the circumferential surface of the horn, and each two symmetrical grooves form a group. In the embodiment, a total of 5 pairs of grooves are opened along the axis of the ultrasonic transducer. The front and rear grooves 302 and the vertical grooves 303 are alternately arranged along the axis direction of the horn, and the groove spacing of the front and rear grooves 302 and the vertical grooves 303 are equal along the axis direction of the horn. In this embodiment, the distance between adjacent front and rear grooves 302 and vertical grooves 303 is 8 mm. Along the direction from the thin end face 301 to the thick end face 304 of the ultrasonic horn 3, the distance between the bottom surfaces of each group of grooves gradually increases. The distance between a group of front and rear grooves 302 on one side of the thin end face 301 is 5 mm, which is equal to half the diameter of the thin end face 301 of the ultrasonic horn 3; the distance between a group of front and rear grooves 302 on one side of the thick section 304 is 9 mm, which is equal to half the diameter of the thick end of the ultrasonic horn 3, and the distance between a group of front and rear grooves 302 in the middle is 7. The center distance of the front and rear grooves 302 on one side of the thin end face 301 is 7 mm from the thin end face, and the center distance of the front and rear grooves 302 on one side of the thick section 304 is 7 mm from the thick end face. A vertical groove 303 is arranged between two adjacent front and rear grooves 302. The distances of the two groups of front and rear grooves 302 from the thin end face to the thick section are 6 mm and 8 mm respectively. This distribution method helps to gradually gather ultrasonic energy on the thin end face 301, and at the same time improves the path of ultrasonic energy transmitted from the thick end to the thin end face 301, thereby reducing the resonance distance and reducing the size of the ultrasonic horn along the left and right directions.

[0034] The vibration converter 5 in the embodiment is a rectangular parallelepiped structure, such as Figure 4 and Figure 5As shown. The front and back sides of the cuboid are square, the side lengths of the front and back sides are both 50mm, and the thickness of the cuboid is 20mm. The cuboid is provided with a plurality of rectangular through slots along the front and back directions. The rectangular through slots are divided into two categories. The first category is the central through slot 504. The central through slot 504 is 40mm high and 4mm wide, so that the upper and lower ends of the vibration converter 5 retain a 5mm area for transmitting vibration. The second category is the upper through slot 505 and the lower through slot 506. The height of the upper through slot 505 and the lower through slot 506 is 20mm, and the width is 4mm, so that the center of the vibration converter 5 retains a 10mm area for transmitting vibration. Along the left and right directions, three center through grooves 504 are evenly distributed, and upper through grooves 505 and lower through grooves 506 are arranged between the center through grooves 504. The center through grooves 504, upper through grooves 505 and lower through grooves 506 are alternately distributed. The thickness of the vibration converter 5 between the center through grooves 504, upper through grooves 505 and lower through grooves 506 is 5 mm. The grooving method in the embodiment can make the central area 503 of the upper surface present one-dimensional ultrasonic vibration in the vertical direction under the condition that there is bending vibration driving with the same phase in the central areas 501 and 502 on the left and right sides of the vibration converter 5, thereby realizing the conversion of bending conversion to ultrasonic vibration in the vertical direction.

[0035] The vibration converter 5 in the embodiment has 4 M5 threaded through holes on the front and rear surfaces, which are symmetrically distributed. They are used to install the support plate. The first threaded hole is located at the center position between the upper end of the first center through groove 504 and the upper surface, and the second threaded hole is located at the center position between the lower end of the first center through groove 504 and the lower surface; the third threaded hole is located at the center position between the upper end of the fifth center through groove 504 and the upper surface, and the fourth threaded hole is located at the center position between the lower end of the fifth axis center through groove 504 and the lower surface. The above four positions are vibration nodes of the vibration converter, which are used to prevent ultrasonic vibration from being transmitted to the housing 6. The left center area 501 and the right center area 502 of the vibration converter 5 are both provided with two M6 threaded blind holes for installing the ultrasonic horn 3.

[0036] The workpiece material in the embodiment is GH4169 high temperature alloy, with a length of 16 mm, a width of 10 mm, and a thickness of 2 mm, and is glued to the central area of ​​the upper surface of the vibration converter using 502 glue.

[0037] In the embodiment, the length of the shell 6 is 55 mm, the width is 50 mm, and four circular holes with a diameter of 5.5 mm are arranged on the surface of the shell 6 at positions corresponding to the threaded holes of the vibration converter. The shell 6 is fixed to the front and rear surfaces of the vibration converter 5 by bolts. There is a circular hole with a diameter of 35 mm at the center of the shell 6. In the working state, the coolant can be sprayed into the interior of the vibration converter 5 through the circular hole to reduce the temperature and prevent the temperature from being too high and the vibration state from decreasing due to ultrasonic vibration. The vibration meter probe can also be extended into the interior of the vibration converter through the center hole to monitor the vibration of the vibration converter. The lower end of the shell is connected to the bottom plate 4, and the bottom plate is installed on the workbench of the grinder. The grinding wheel rotation motion and workpiece feeding motion provided by the grinder, and the vibration converter 5 provide vertical ultrasonic vibration, realize ultrasonic vibration-assisted grinding of the workpiece in the vertical direction.

[0038] In the embodiment, the bending ultrasonic vibration outputted from the thin end surface 301 of the ultrasonic horn 3 is converted into the vertical ultrasonic vibration at the center position 503 of the upper surface by the vibration converter 5. The vertical ultrasonic vibration-assisted grinding of the workpiece is realized. The detailed steps are as follows: turn on the ultrasonic power supply, and the two groups of piezoelectric ceramics 2 generate bending ultrasonic vibrations of a fixed frequency, which drive the ultrasonic horn 3 to generate second-order bending ultrasonic vibrations, such as Figure 8 As shown; the bending vibrations of the two ultrasonic amplitude transformers are in phase, and the vertical vibration is converted through the bending conversion of the vibration converter 5, forming a one-dimensional radial ultrasonic vibration at the center position of the upper surface of the vibration converter 5, and the workpiece is pasted at the center position 503 of the upper surface of the vibration converter to realize vertical ultrasonic vibration-assisted grinding of the workpiece 8.

[0039] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. Small size bending conversion vertical direction ultrasonic assisted grinding device, characterized by: The invention comprises a transducer rear cover plate (1), a piezoelectric ceramic (2), an ultrasonic horn (3), a bottom plate (4), and a vibration converter (5); the bending vibration ultrasonic transducer comprises the transducer rear cover plate (1), the piezoelectric ceramic (2), and the ultrasonic horn (3); a bending vibration ultrasonic transducer is installed in the left side center area 501 and the right side center area 502 of the vibration converter (5); a housing (6) is fixedly installed on the front and rear sides of the vibration converter (5); the bottom plate (4) is fixedly installed on the lower end of the housing (6); the bottom plate (4) is fixed on the grinding machine workbench; the transducer rear cover plate (1), the piezoelectric ceramic (2), and the rough end surface of the ultrasonic horn (3) are fixedly connected in sequence; and the thin end surface of the ultrasonic horn (3) is fixedly connected to the vibration converter (5); The vibration converter (5) is a hollow rectangular parallelepiped structure, the ultrasonic horn (3) is a truncated cone structure, the ultrasonic horn (3) is provided with front and rear grooves (302) along the front and rear direction and with vertical grooves (303) in the vertical direction, each of the front and rear grooves (302) and the vertical grooves (303) is provided with grooves of the same size on the symmetric plane of the horn axis, and the front and rear grooves (302) and the vertical grooves (303) are alternately arranged along the horn axis direction.

2. The small-size bending conversion vertical direction ultrasonic assisted grinding device according to claim 1 is characterized in that: The vibration converter (5) is square at the front and rear sides, the sides of which are both 50 mm long, and the thickness of the cuboid is 20 mm. The cuboid is provided with a plurality of central through slots (504), upper through slots (505) and lower through slots (506) along the front-to-back direction. The central through slot (504) is 40 mm high and 4 mm wide, the upper through slots (505) and the lower through slots (506) are 20 mm high and 4 mm wide, three central through slots (504) are evenly distributed along the left-right direction, upper through slots (505) and lower through slots (506) are provided between the central through slots (504), the thickness of the vibration converter 5 between the central through slot (504) and the upper through slot (505) and the lower through slot (506) is 5 mm, and the thickness of the vibration converter (5) between the upper through slot (505) and the lower through slot (506) is 10 mm.

3. The small-size bending conversion vertical direction ultrasonic assisted grinding device according to claim 1 is characterized in that: The distance between adjacent front and rear grooves (302) and vertical grooves (303) is 8 mm. Every two front and rear grooves (302) symmetrical along the axis of the horn form a group, and every two vertical grooves (303) symmetrical along the axis of the horn form a group. Along the direction from the thin end surface (301) to the thick end surface 304 of the ultrasonic horn (3), the distance between the bottom surfaces of each group of grooves gradually increases. The distance between a group of front and rear grooves (302) on one side of the thin end surface (301) is 5 mm, which is equal to half the diameter of the thin end surface (301) of the ultrasonic horn (3); the distance between a group of front and rear grooves (302) on one side of the thick section 304 is 9 mm, which is equal to half the diameter of the thick end of the ultrasonic horn (3). The distance between a group of front and rear grooves (302) in the middle is 7 mm.

4. The small-size bending conversion vertical direction ultrasonic assisted grinding device according to claim 3 is characterized in that: The center distance between the front and rear grooves (302) on one side of the thin end surface (301) and the thin end surface is 7 mm, and the center distance between the front and rear grooves (302) on one side of the rough section 304 and the rough end surface is 7 mm. A vertical groove (303) is provided between two adjacent front and rear grooves (302). The distances between the two groups of front and rear grooves (302) from the thin end surface to the rough section are 6 mm and 8 mm respectively.

5. The small-size bending conversion vertical direction ultrasonic assisted grinding device according to claim 1 is characterized in that: The material of the piezoelectric ceramic (2) is lead zirconate titanate, with an outer diameter of 18 mm, an inner diameter of 8 mm, and a thickness of 5 mm. A group of piezoelectric ceramics contains 4 pieces, which are arranged concentrically in sequence. The outer diameter of the rear cover plate is the same as the outer diameter of the piezoelectric ceramic. The diameter of the coarse end face of the ultrasonic horn (3) is equal to the diameter of the piezoelectric ceramic, both of which are 18 mm. The diameter of the fine end face (301) of the ultrasonic horn (3) is 10 mm, and the length is 48 mm.

6. The small-size bending conversion vertical direction ultrasonic assisted grinding device according to any one of claims 1 to 5, characterized in that: The vibration converter (5) has four M5 threaded through holes on the front and rear surfaces, which are symmetrically distributed. The first threaded hole is located at the center position between the upper end of the first center through groove (504) and the upper surface, the second threaded hole is located at the center position between the lower end of the first center through groove (504) and the lower surface, the third threaded hole is located at the center position between the upper end of the fifth center through groove (504) and the upper surface, and the fourth threaded hole is located at the center position between the lower end of the fifth axis center through groove (504) and the lower surface. The above four positions are vibration nodes of the vibration converter, which are used to prevent ultrasonic vibration from being transmitted to the shell (6). The left center area 501 and the right center area 502 of the vibration converter (5) are both provided with two M6 threaded blind holes for installing the ultrasonic horn (3).

7. The small-size curved vertical ultrasonic-assisted grinding device according to any one of claims 1 to 5, characterized in that: The workpiece material is GH4169 high temperature alloy, with a length of 16 mm, a width of 10 mm, and a thickness of 2 mm, and is glued to the central area of ​​the upper surface of the vibration converter.

8. The small-size bending conversion vertical direction ultrasonic assisted grinding device according to claim 6 is characterized in that: The shell (6) has a length of 55 mm and a width of 50 mm. Four circular holes with a diameter of 5.5 mm are arranged on the surface of the shell (6) at positions corresponding to the threaded holes of the vibration converter. The shell (6) is fixed to the front and rear surfaces of the vibration converter (5) by bolts. A circular hole with a diameter of 35 mm is arranged at the center of the shell (6).

9. The method for using the small-size bending conversion vertical direction ultrasonic assisted grinding device according to claim 7, characterized in that: The workpiece is pasted at the center position 503 on the upper surface of the vibration converter, and the ultrasonic power supply connected to the piezoelectric ceramic (2) is turned on. The piezoelectric ceramic (2) generates a fixed-frequency bending ultrasonic vibration, which drives the ultrasonic amplitude transformer (3) to generate a second-order bending ultrasonic vibration. The bending vibrations of the two ultrasonic amplitude transformers have the same phase. After the bending conversion of the vibration converter (5), the vibration is converted in the vertical direction, and a one-dimensional radial ultrasonic vibration is formed at the center position of the upper surface of the vibration converter (5), thereby realizing vertical ultrasonic vibration-assisted grinding of the workpiece (8).

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