CN111926160A - Ultrasonic shot blasting device for surface strengthening of cylindrical gear - Google Patents
Ultrasonic shot blasting device for surface strengthening of cylindrical gear Download PDFInfo
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- CN111926160A CN111926160A CN202010602661.7A CN202010602661A CN111926160A CN 111926160 A CN111926160 A CN 111926160A CN 202010602661 A CN202010602661 A CN 202010602661A CN 111926160 A CN111926160 A CN 111926160A
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D7/00—Modifying the physical properties of iron or steel by deformation
- C21D7/02—Modifying the physical properties of iron or steel by deformation by cold working
- C21D7/04—Modifying the physical properties of iron or steel by deformation by cold working of the surface
- C21D7/06—Modifying the physical properties of iron or steel by deformation by cold working of the surface by shot-peening or the like
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Abstract
The invention discloses an ultrasonic shot blasting device for surface strengthening of a cylindrical gear, which comprises a workbench, a shot blasting chamber, an ultrasonic vibration device and a gear clamping device, and is characterized in that the shot blasting chamber consists of a shifted inner gear ring tool head, a bottom plate and a top plate, the shifted inner gear ring tool head is matched with a gear to be shot blasted, the tooth side clearance formed by each tooth on the gear to be shot blasted and the shifted inner gear ring tool head is equal, the ultrasonic vibration device can generate ultrasonic traveling waves on the inner surface of the shifted inner gear ring tool head, shots are placed in the shot blasting chamber, the supporting surface of the bottom plate for supporting the shots is a conical surface, the gear to be shot blasted is installed on a lifting platform through the gear clamping device, the gear clamping device consists of a mandrel, a screw rod, a nut, a pressing ring and a pressing plate assembly, the invention utilizes the shifted inner gear ring tool head in the shape of the, the shot blasting chamber equal to the tooth side clearance of the gear to be subjected to shot blasting is constructed, and the problems that due to the fact that the depth of a tooth groove is deep, shots cannot effectively impact the tooth surface close to the tooth root part, and the ultrasonic shot blasting effect is poor are solved.
Description
Technical Field
The invention relates to the technical field of part surface strengthening equipment, in particular to an ultrasonic shot blasting device for strengthening the surface of a cylindrical gear.
Background
Shot peening is a cold machining surface modification and forming technology, and under the action of high pressure wind or compressed air, shots impact a workpiece at a certain speed to enable the material to generate elastic-plastic deformation and form pits on the surface of metal, so that countless pits are generated and overlapped to form a uniform residual compressive stress layer. However, the impact force of the conventional mechanical shot blasting shot is limited, the depth of the residual stress generated by the conventional mechanical shot blasting shot is also limited, and the dent generated on the surface is relatively deep, so that the roughness of the metal surface is increased, and a subsequent finishing process needs to be added to ensure the roughness of the part. In addition, the existing shot blasting method is mostly applied to dry shot blasting, and due to the fact that a large number of shots are broken, dust pollution on a working site is serious, and the physical health of workers is seriously affected.
In order to solve the above problems, many new technologies such as high-pressure water jet peening, laser peening, and ultrasonic peening have been studied and developed. The ultrasonic shot blasting is used as a novel surface modification and forming technology, the speed of the shot is given by the aid of a vibrating tool head, after the shot is impacted with a sample, the shot can fall back to the tool head due to gravity, the tool head can give the speed of the shot again, and repeated operation is carried out to realize repeated impact of the shot on the sample material. Compared with the traditional shot blasting technology, the ultrasonic shot blasting can generate larger residual compressive stress and deeper depth of a hardened layer, and meanwhile, the surface roughness is good, and the dosage of the shot materials is less. Ultrasonic peening is currently used in a large number of developed countries, such as france and germany, in the aerospace, shipbuilding and automotive industries.
For cylindrical gear parts, the density of incident shot flow is equal under the same projection area, but because the tooth surface is in an involute shape, the actual areas corresponding to the same projection area are different at different positions of the tooth surface, so that the times of the impact of the shots on different positions of the tooth surface are different, and under the same projection area, the actual area corresponding to the tooth root position is the minimum, so that the times of the impact of the shots on the tooth root position are the maximum, and the overspray is easy to generate; the actual area corresponding to the pitch circle position is larger, so that the number of times of bullet impact at the pitch circle position is less, and under-spray is easy to generate. In addition, the existing ultrasonic shot blasting technology adopts a planar tool head to drive the shot to impact a workpiece, because the depth direction of the tooth socket is deep and the width is narrow, the tool head is difficult to go deep into the tooth socket, and if the tool head is arranged at the tooth top position, the shot is difficult to effectively impact the tooth root position, and the shot blasting treatment can be carried out on the whole tooth socket only by adding a rotary indexing device, so that the processing efficiency is low.
Disclosure of Invention
The invention aims to provide an ultrasonic shot blasting device for strengthening the surface of a cylindrical gear, which is used for solving the problems that the shot blasting strength of the surface of the gear is inconsistent and the efficiency of the conventional ultrasonic shot blasting gear processing is low due to the conventional shot blasting method.
In order to achieve the purpose, the invention adopts the following technical scheme that the ultrasonic shot blasting device for surface strengthening of the cylindrical gear comprises a workbench, a shot blasting chamber, an ultrasonic vibration device and a gear clamping device, and is characterized in that the ultrasonic vibration device is installed on the workbench through a support, a through hole through which a gear to be shot blasted can pass is formed in the workbench, the shot blasting chamber consists of a shifted inner gear ring tool head, a bottom plate and a top plate, the shifted inner gear ring tool head is matched with the gear to be shot blasted, the tooth side clearance formed by each tooth on the gear to be shot blasted is equal to the tooth side clearance formed by the shifted inner gear ring tool head, the ultrasonic vibration device can generate ultrasonic traveling waves on the inner surface of the shifted inner gear ring tool head, inner gear-shaped through holes are formed in the bottom plate and the top plate, and the radial clearance formed by the through holes in the bottom plate and the, the radius of the shot is larger than, the radial clearance formed by the shifted inner gear ring tool head and the gear to be shot-blasted is larger than the diameter of the shot and smaller than the sum of the diameter of the shot and the maximum amplitude of the ultrasonic vibration head, the shot is placed in the shot blasting chamber, the supporting surface of the bottom plate for supporting the shot is a conical surface, the gear to be shot-blasted is installed on a lifting table through a gear clamping device, the gear clamping device is composed of a mandrel, a screw rod, a nut, a pressing ring and a pressing plate assembly, and the assembling method of the gear clamping device is as follows: 1) firstly, adjusting a lifting platform to the lowest point, placing a mandrel on the lifting platform, mounting a gear to be shot-blasted on the mandrel, pressing the gear to be shot-blasted by a pressing ring, sequentially passing a screw through a mounting hole on the lifting platform, a through hole in the mandrel and a through hole on the pressing ring, and pre-tightening by using a nut; 2) adjusting the position of a lifting platform, inserting a gear to be shot-blasted into a shot blasting chamber, aligning the lower surface of the gear to be shot-blasted with the lower surface of a tool head of a shifted inner gear ring, rotating a mandrel to enable the gap formed by each tooth of the gear to be shot-blasted to be equal to the gap formed by the shifted inner gear ring in the tool head of the shifted inner gear ring, compressing the mandrel by a pressing plate assembly, and finally screwing a nut.
Preferably, the ultrasonic vibration device is composed of two groups of ultrasonic vibration heads with equal amplitude and 90-degree phase difference, wherein one group generates complete vibration, the other group generates radial vibration, and the difference of the connection points of the two groups of ultrasonic vibration heads on the tool head of the position-changing inner gear ring is a quarter wavelength.
Preferably, the ultrasonic vibration head consists of a transducer and an amplitude transformer.
Preferably, the number of teeth and the module of the tool head of the shifted inner gear ring are equal to those of the gear to be shot-blasted.
Preferably, the included angle between the base plate conical surface generatrix and the horizontal line is 1-2 degrees.
Preferably, the lifting platform can be driven by air or hydraulic pressure.
Preferably, the shots are uniformly distributed in the shot blasting chamber, and the perimeter of the outline formed by tightly arranging all the shots is 70-80% of the perimeter of the outline of the inner ring of the tool head of the shifting inner ring gear.
Preferably, the amplitude range of the ultrasonic vibration head is 20-60 micrometers, and the vibration frequency of the ultrasonic vibration head is 20-30 kHz.
The invention has the beneficial effects that the shot blasting chamber which is equal to the tooth side clearance of the gear to be shot blasted is constructed by utilizing the matching of the tool head in the shape of the shifted inner gear ring and the gear to be shot blasted, and the problems that the tooth surface close to the tooth root part cannot be effectively impacted by the shot due to the deeper depth of the tooth groove and the ultrasonic shot blasting effect is poor are solved.
The ultrasonic vibration device comprises a transducer A, an amplitude transformer A, a transducer B, an amplitude transformer B and a shifted inner gear ring tool head, wherein the amplitude of an ultrasonic vibration head consisting of the transducer A and the amplitude transformer A is equal to that of an ultrasonic vibration head consisting of the transducer B and the amplitude transformer B, the phase difference is 90 degrees, the distance between the connection points of the amplitude transformer A and the amplitude transformer B on the shifted inner gear ring tool head is one quarter of the wavelength, one group of the ultrasonic vibration heads generate radial vibration, the other group of the ultrasonic vibration heads generate bending vibration, the two vibrations are compounded to form ultrasonic traveling waves, and the ultrasonic traveling waves can enable all mass points on an inner gear ring of the shifted inner gear ring tool head to generate spatial elliptical motion vertical to the inner surface of the shifted inner gear ring tool head, so that shots close to the inner wall are driven to impact the tooth surface of a gear to be shot; in addition, because each tooth on the tool head of the profile shifted inner gear ring is equal to the tooth side gap formed by the gear to be shot-blasted, the distances from each point on the tooth surface of the gear to be shot-blasted to the corresponding position of the inner gear ring of the tool head are equal, and the force of the shot impacting the tooth surface is the same, thereby solving the problem of uneven shot-blasting strength and coverage rate of the tooth surface of a cylindrical gear part in the prior art; and the through holes in the bottom plate and the top plate are in clearance fit with the gear to be shot-blasted, and the radial clearance is greater than the radius of the shot and smaller than the diameter of the shot, so that the shot can not be ejected from a shot blasting chamber in the shot blasting process, the recycling rate of the shot is improved, and the shot blasting cost is reduced. The radial clearance between the tool head of the shifted inner gear ring and the gear to be shot-blasted is larger than the diameter of the shot and smaller than the sum of the diameter of the shot and the maximum amplitude of the ultrasonic vibration head, so that the shot can automatically jump between the inner surface of the tool head of the shifted inner gear ring and the tooth surface of the gear to be shot-blasted, and meanwhile, the radial clearance is not too large, so that the shot-blasting strength is not enough.
Because the surface of the bottom plate for supporting the shot is a conical surface, the shot always abuts against the inner wall of the shifted inner gear ring tool head in an initial state under the influence of gravity, so that the shot can be driven by the shifted inner gear ring tool head when the shot blasting work starts, and meanwhile, the included angle between a conical bus and a horizontal line is preferably 1-2 degrees, so that a large amount of energy loss after the shot is ejected by the shifted inner gear ring tool head can be avoided. In addition, all particles on the inner wall of the tool head of the shifted inner gear ring generate spatial elliptical motion perpendicular to the inner surface of the tool head of the shifted inner gear ring due to the ultrasonic traveling waves, so that a deflection angle is generated when the shot is shot out, and after the shot impacts the surface of a part, incident rays and reflected rays form a certain included angle, so that the probability of collision of the incident shot and the reflected shot in a shot blasting chamber is reduced, the energy loss is reduced, and the shot blasting efficiency is improved.
In the gear clamping process, the tool head of the shifted inner gear ring is in clearance fit with the gear to be shot-blasted, and in order to ensure that the gear side clearance formed by each tooth and the tool head of the shifted inner gear ring is equal, the position of the gear to be shot-blasted is required to be adjusted in the assembling method, so that the mandrel is fixed by the pressing plate assembly, and the gear side clearance between the gear to be shot-blasted and the tool head of the shifted inner gear ring is convenient to adjust in the assembling method.
Drawings
Fig. 1 is a schematic view of the overall assembly of the present invention.
FIG. 2 is a schematic view showing the internal structure of the blasting chamber according to the present invention.
Fig. 3 is a schematic view of the bottom plate structure of the present invention.
Fig. 4 is a schematic view of a tool head structure of the shifted ring gear of the present invention.
Fig. 5 is a schematic view of the mandrel structure of the present invention.
The labels in the figure are: 1-a workbench; 2-support A; 3-support B; 4-a horn a; 5-transducer A; 6-transducer B; 7-a horn B; 8-a gear to be shot-peened; 9-pressing a ring; 10-a screw; 11-a nut; 12-a top plate; 13-shifting inner gear ring tool heads; 14-a base plate; 15-a mandrel; 16-a platen assembly; 17-a lifting platform; 18-pill.
Detailed description of the preferred embodiments
The invention is further explained according to the specific embodiment, referring to fig. 1-5, an ultrasonic shot blasting device for surface strengthening of a cylindrical gear comprises a workbench 1, a shot blasting chamber, an ultrasonic vibration device and a gear clamping device, and is characterized in that the ultrasonic vibration device comprises a transducer A5, a horn A4, a transducer B6, a horn B7 and a shifting ring gear tool head 13, the ultrasonic vibration head formed by the transducer A5 and the horn A4 is equal to the ultrasonic vibration head formed by the transducer B6 and the horn B7 in amplitude and has a phase difference of 90 degrees, one group of the ultrasonic vibration heads generates radial vibration, the other group generates bending vibration, the connection point of the horn A4 and the horn B7 on the shifting ring gear tool head 13 has a quarter wavelength difference, the ultrasonic vibration device is installed on the workbench 1 through a support A2 and a support B3, the workbench 1 is provided with a through hole through which a shot blasting gear 8 can pass, the shot blasting chamber is composed of a shifted inner gear ring tool head 13, a bottom plate 14 and a top plate 12, the shifted inner gear ring tool head 13 is matched with a gear 8 to be blasted, a gear side gap formed by each gear on the gear 8 to be blasted and the shifted inner gear ring tool head 13 is equal, the ultrasonic vibration device can generate ultrasonic traveling waves on the inner surface of the shifted inner gear ring tool head 13, through holes in the shape of an inner gear ring are formed in the bottom plate 14 and the top plate 12, a radial gap formed by the through holes in the bottom plate 14 and the top plate 12 and the gear 8 to be blasted is smaller than the diameter of a shot 18 and larger than the radius of the shot 18, the radial gap formed by the shifted inner gear ring tool head 13 and the gear 8 to be blasted is larger than the diameter of the shot 18 and smaller than the sum of the diameter of the shot 18 and the maximum amplitude of the ultrasonic vibration head, the shot 18 is placed, the gear 8 to be shot-blasted is arranged on a lifting platform 17 through a gear clamping device, the gear clamping device is composed of a mandrel 15, a screw 10, a nut 11, a pressing ring 9 and a pressing plate assembly 16, and the assembly method of the gear clamping device is as follows: 1) firstly, adjusting a lifting platform 17 to the lowest point, placing a mandrel 15 on the lifting platform 17, installing a gear 8 to be shot-blasted on the mandrel 15, pressing the gear 8 to be shot-blasted by a pressing ring 9, sequentially passing a screw 10 through an installation hole on the lifting platform 17, a through hole in the mandrel 15 and a through hole on the pressing ring 9, and pre-tightening by using a nut 11; 2) adjusting the position of a lifting platform 17, inserting the gear 8 to be peened into a peen chamber, aligning the lower surface of the gear 8 to be peened with the lower surface of the shifted inner gear ring tool head 13, rotating a mandrel 15 to enable the tooth side gaps formed by the teeth of the gear 8 to be peened and the shifted inner gear ring tool head 13 to be equal, pressing the mandrel 15 by a pressing plate assembly 16, and finally screwing a nut 11.
Preferably, the number of teeth and the module of the tool head 13 of the shifted inner gear ring are equal to those of the gear 8 to be shot-peened.
Preferably, the included angle between the generatrix of the conical surface of the bottom plate 14 and the horizontal line is 1-2 degrees.
Preferably, the lifting table 17 may be driven pneumatically or hydraulically.
Preferably, the shots 18 are uniformly distributed in the shot blasting chamber, and the perimeter of the outline formed by closely arranging all the shots 18 is 70-80% of the perimeter of the outline of the inner ring of the shifting inner ring gear tool head 13.
Preferably, the amplitude range of the ultrasonic vibration head is 20-60 micrometers, and the vibration frequency of the ultrasonic vibration head is 20-30 kHz.
The ultrasonic shot peening embodiment is as follows: firstly, adjusting a lifting platform 17 to the lowest point, placing a mandrel 15 on the lifting platform 17, installing a gear 8 to be shot-blasted on the mandrel 15, pressing the gear 8 to be shot-blasted by a pressing ring 9, sequentially passing a screw 10 through an installation hole on the lifting platform 17, a through hole in the mandrel 15 and a through hole on the pressing ring 9, and pre-tightening by a nut 11; adjusting the position of a lifting platform 17, inserting the gear 8 to be shot into a shot blasting chamber, aligning the lower surface of the gear 8 to be shot with the lower surface of the shifted inner gear ring tool head 13, rotating a mandrel 15 to enable the gaps formed by the teeth of the gear 8 to be shot and the shifted inner gear ring in the shifted inner gear ring tool head 13 to be equal, pressing the mandrel 15 by a pressing plate assembly 16, and finally screwing a nut 11. Respectively connecting the transducer A5 and the transducer B6 with an ultrasonic power supply, starting the ultrasonic power supply, converting an alternating current electrical signal into an electrical signal with ultrasonic frequency of 20 kHz-30 kHz by the ultrasonic power supply, converting the electrical signal with the ultrasonic frequency into mechanical vibration with the same frequency by the ultrasonic transducer, and respectively transmitting the mechanical vibration to the amplitude transformer A and the amplitude transformer B; the amplitude generated by the transducer is small, generally about 0.5-3 microns, and the amplitude transformer can amplify the amplitude according to a certain designed multiple under the condition of keeping the ultrasonic vibration frequency unchanged and generate different types of vibration; one of the amplitude transformer generates radial vibration, the other amplitude transformer generates bending vibration, the amplitudes are the same, the phase difference is 90 degrees, the tool head 13 of the shifted inner gear ring generates ultrasonic traveling waves under the combined action of the radial vibration and the bending vibration, the amplitude is 20-60 microns, all particles on the inner gear ring of the tool head 13 of the shifted inner gear ring generate spatial elliptical motion vertical to the inner surface of the tool head of the shifted inner gear ring by the traveling waves, and further, the shot 18 close to the inner wall is driven to impact the gear 8 to be shot-blasted, so that the surface strengthening treatment of the gear is realized. Meanwhile, the lifting platform 17 drives the gear 8 to be shot-blasted to move downwards, shot-blasting strengthening of the whole tooth surface is achieved, and after shot blasting is finished, the ultrasonic power supply is turned off.
While there have been shown and described what are at present considered the fundamental principles and essential features of the invention and its advantages, it will be understood by those skilled in the art that the invention is not limited by the embodiments described above, which are merely illustrative of the principles of the invention, but that various changes and modifications may be made therein without departing from the spirit and scope of the invention as defined by the appended claims and their equivalents.
Claims (8)
1. An ultrasonic shot blasting device for surface strengthening of a cylindrical gear comprises a workbench, a shot blasting chamber, an ultrasonic vibration device and a gear clamping device, and is characterized in that the ultrasonic vibration device is installed on the workbench through a support, a through hole through which a gear to be shot blasted can pass is formed in the workbench, the shot blasting chamber is composed of a shifted inner gear ring tool head, a bottom plate and a top plate, the shifted inner gear ring tool head is matched with the gear to be shot blasted, the tooth side clearance formed by each tooth on the gear to be shot blasted and the shifted inner gear ring tool head is equal, the ultrasonic vibration device can generate ultrasonic traveling waves on the inner surface of the shifted inner gear ring tool head, inner gear ring-shaped through holes are formed in the bottom plate and the top plate, the radial clearance formed by the through holes in the bottom plate and the top plate and the gear to be shot blasted is smaller than the diameter of a shot and larger than the radius of the shot, and the radial clearance formed, the shot blasting machine is characterized in that the shot blasting machine is smaller than the sum of the diameter of a shot and the maximum amplitude of an ultrasonic vibration head, the shot is placed in a shot blasting chamber, a supporting surface of a bottom plate for supporting the shot is a conical surface, a gear to be subjected to shot blasting is mounted on a lifting table through a gear clamping device, the gear clamping device is composed of a mandrel, a screw, a nut, a pressing ring and a pressing plate assembly, and the assembling method of the gear clamping device is as follows: 1) firstly, adjusting a lifting platform to the lowest point, placing a mandrel on the lifting platform, mounting a gear to be shot-blasted on the mandrel, pressing the gear to be shot-blasted by a pressing ring, sequentially passing a screw through a mounting hole on the lifting platform, a through hole in the mandrel and a through hole on the pressing ring, and pre-tightening by using a nut; 2) adjusting the position of a lifting platform, inserting a gear to be shot-blasted into a shot blasting chamber, aligning the lower surface of the gear to be shot-blasted with the lower surface of a tool head of a shifted inner gear ring, rotating a mandrel to enable the gap formed by each tooth of the gear to be shot-blasted to be equal to the gap formed by the shifted inner gear ring in the tool head of the shifted inner gear ring, compressing the mandrel by a pressing plate assembly, and finally screwing a nut.
2. The ultrasonic shot-blasting machine for cylindrical gear surface peening according to claim 1, characterized in that: the ultrasonic vibration device is composed of two groups of ultrasonic vibration heads with equal amplitude and 90-degree phase difference, wherein one group generates complete vibration, the other group generates radial vibration, and the difference of the connection points of the two groups of ultrasonic vibration heads on the tool head of the position-changing inner gear ring is a quarter wavelength.
3. An ultrasonic peening apparatus for surface peening of a cylindrical gear according to claim 2, wherein: the ultrasonic vibration head consists of an energy converter and an amplitude transformer.
4. The ultrasonic shot-blasting machine for cylindrical gear surface peening according to claim 1, characterized in that: the number of teeth and the modulus of the tool head of the shifted inner gear ring are equal to those of the teeth and the modulus of the tool head of the shot blasting gear.
5. The ultrasonic shot-blasting machine for cylindrical gear surface peening according to claim 1, characterized in that: and the included angle between the base plate conical surface bus and the horizontal line is 1-2 degrees.
6. The ultrasonic shot-blasting machine for cylindrical gear surface peening according to claim 1, characterized in that: the lifting platform can be driven pneumatically or hydraulically.
7. The ultrasonic shot-blasting machine for cylindrical gear surface peening according to claim 1, characterized in that: the shots are uniformly distributed in the shot blasting chamber, and the perimeter of the outline formed by tightly arranging all the shots is 70-80% of the perimeter of the outline of the inner ring of the tool head of the shifting inner ring gear.
8. An ultrasonic peening apparatus for surface peening of a cylindrical gear according to claim 2, wherein: the amplitude range of the ultrasonic vibration head is 20-60 micrometers, and the vibration frequency of the ultrasonic vibration head is 20-30 kHz.
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| CN202010602661.7A CN111926160B (en) | 2020-06-29 | 2020-06-29 | Ultrasonic shot blasting device for surface strengthening of cylindrical gear |
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| CN202010602661.7A CN111926160B (en) | 2020-06-29 | 2020-06-29 | Ultrasonic shot blasting device for surface strengthening of cylindrical gear |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113186378A (en) * | 2021-04-29 | 2021-07-30 | 湖南科技大学 | Shot type gear ultrasonic shot blasting strengthening device |
| CN113186379A (en) * | 2021-04-29 | 2021-07-30 | 湖南科技大学 | Striker type gear ultrasonic shot peening strengthening device |
| CN114480827A (en) * | 2022-01-28 | 2022-05-13 | 中南大学 | Ultrasonic shot peening strengthening device for gear parts |
| CN114941066A (en) * | 2022-05-27 | 2022-08-26 | 南京航空航天大学 | Liquid nitrogen cooled ultrasonic shot blasting device and method |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113186378A (en) * | 2021-04-29 | 2021-07-30 | 湖南科技大学 | Shot type gear ultrasonic shot blasting strengthening device |
| CN113186379A (en) * | 2021-04-29 | 2021-07-30 | 湖南科技大学 | Striker type gear ultrasonic shot peening strengthening device |
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| CN114941066A (en) * | 2022-05-27 | 2022-08-26 | 南京航空航天大学 | Liquid nitrogen cooled ultrasonic shot blasting device and method |
| CN114941066B (en) * | 2022-05-27 | 2023-06-02 | 南京航空航天大学 | Liquid nitrogen cooled ultrasonic shot peening device and method |
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| CN111926160B (en) | 2022-03-29 |
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