CN113146052B

CN113146052B - Laser shot peening strengthening device and machining method for thin-wall annular part

Info

Publication number: CN113146052B
Application number: CN202110390859.8A
Authority: CN
Inventors: 孙谨; 孟宪凯; 周建忠; 陈寒松; 李礼
Original assignee: Jiangsu University
Current assignee: Jiangsu University
Priority date: 2021-04-12
Filing date: 2021-04-12
Publication date: 2023-03-24
Anticipated expiration: 2041-04-12
Also published as: CN113146052A

Abstract

The invention provides a laser shot peening strengthening device and a processing method for a thin-wall annular part, wherein the laser shot peening strengthening device comprises a laser generating device, a light path transmission system, an automatic feeding and discharging mechanical arm, a station turntable, a workpiece clamp system and an automatic adhesive tape sticking device; the station turntable comprises at least 2 processing stations and a feeding and discharging station; the automatic feeding and discharging manipulator is used for grabbing the thin-wall annular part at a feeding and discharging station; the laser beams are respectively emitted to the outer ring of the thin-wall annular part of the processing station through the light path transmission system and are used for strengthening the thin-wall annular part; a workpiece clamp system and an automatic adhesive tape sticking device are arranged on each station of the station turntable; the workpiece clamp system is used for clamping the thin-wall annular part and then enabling the thin-wall annular part to rotate; the automatic adhesive tape sticking device is used for forming a constraint layer on the outer ring of the thin-wall annular part. The invention forms uniformly distributed residual compressive stress on the surface layer of the thin-wall annular part and improves the fatigue life of the thin-wall annular part.

Description

Laser shot peening strengthening device and machining method for thin-wall annular part

Technical Field

The invention relates to the technical field of laser processing or the field of surface strengthening of thin-plate parts, in particular to a laser shot blasting strengthening device and a processing method for a thin-wall annular part.

Background

The thin-wall annular part has the advantages of light weight, high thrust-weight ratio, compact structure and the like, is widely applied to the equipment manufacturing industry, and directly determines the performance and reliability of the heavy equipment. The working performance and the service life of the thin-wall annular part are mainly determined by the fatigue resistance of the working surface of the thin-wall annular part, and the key factor influencing the fatigue resistance of the thin-wall annular part is the size and the distribution state of the residual stress on the surface layer of the thin-wall annular part. The residual tensile stress can cause the fatigue life of the thin-wall annular part to be shortened, and the residual compressive stress is beneficial to improving the fatigue life of the thin-wall annular part. Since the residual compressive stress suppresses not only fatigue crack initiation but also fatigue crack propagation. At present, the residual stress of the surface layer of the thin-wall annular part is mainly generated by the grinding force of a grinding wheel, the residual compressive stress value generated by grinding is small, the influence layer is shallow, and the fatigue resistance of the thin-wall annular part is poor. Therefore, in order to improve the surface properties and the service life of thin-walled annular parts, it is necessary to adopt a surface strengthening technique.

The laser shot peening strengthening technology is a novel surface strengthening technology which is rapidly developed in recent years, surface modification is carried out on a processed material or a part by utilizing stress strengthening and structure strengthening effects induced by high-energy short pulse laser shock waves, so that the fatigue strength of the material can be effectively improved, and meanwhile, the laser shot peening strengthening technology has the characteristics of non-contact, convenience in operation, strong controllability, wide application range and the like, so that the laser shot peening strengthening technology has a good application prospect in the field of surface strengthening of thin-wall annular parts.

However, the laser peening strengthening technology for thin-wall annular parts at present mainly has the following problems:

(1) the thin-wall annular part can generate uneven plastic deformation after being subjected to laser shot peening strengthening, so that the surface stress state of the thin-wall annular part is unevenly distributed, the surface stress of the part is concentrated in actual work, and the uneven surface stress state is not beneficial to prolonging the fatigue life of the thin-wall annular part.

(2) The laser shot peening strengthening processing efficiency of the thin-wall annular part is low, the automation degree of processing equipment is low, and the flexibility degree is low.

The prior art discloses a thin-wall annular part laser strengthening device, which carries out point-by-point lap joint strengthening on the thin-wall annular part through double laser beams, easily causes the error accumulation of uneven distribution of residual stress on the surface of the part, is troublesome to clamp, can only carry out strengthening treatment on a single thin-wall annular part, and is not easy to realize the automatic production requirement.

Disclosure of Invention

Aiming at the defects in the prior art, the invention provides a laser shot peening strengthening device and a processing method for a thin-wall annular part, which can form uniformly distributed residual compressive stress on the surface layer of the thin-wall annular part and prolong the fatigue life of the thin-wall annular part; the invention can also improve the processing efficiency and has high flexibility.

The present invention achieves the above-described object by the following technical means.

A laser shot peening strengthening device for a thin-wall annular part comprises a laser generating device, a light path transmission system, an automatic loading and unloading manipulator, a station turntable, a workpiece clamp system and an automatic adhesive tape sticking device;

the laser generating device is used for generating laser beams; the station turntable comprises at least 2 processing stations and a feeding and discharging station; the automatic feeding and discharging manipulator is used for grabbing the thin-wall annular part at a feeding and discharging station; the laser beams are respectively emitted to the outer rings of the thin-wall annular parts of the processing stations through the optical path transmission system and are used for strengthening the thin-wall annular parts; a workpiece clamp system and an automatic adhesive tape sticking device are arranged on each station of the station turntable; the workpiece clamp system is used for clamping the thin-wall annular part and then enabling the thin-wall annular part to rotate; the automatic adhesive tape sticking device is used for forming a constraint layer on the outer ring of the thin-wall annular part.

Further, the work piece holder system includes pneumatic three-jaw chuck, ring flange, motor cabinet and first rotating electrical machines, pneumatic three-jaw chuck installs on the ring flange, the ring flange pass through the motor cabinet with first rotating electrical machines links to each other for it is rotatory to make pneumatic three-jaw chuck.

Further, the automatic tape sticking device comprises a first tape winding drum, a second rotating motor, a tape sticking roller and a tape sticking roller bracket; the first adhesive tape roller and the second adhesive tape roller are symmetrically distributed on two sides of the station, a black adhesive tape is arranged between the first adhesive tape reel and the second adhesive tape reel, and the second rotating motor is used for driving the second adhesive tape reel to rotate, so that the black adhesive tape is continuously replaced in the thin-wall annular part machining process; the black adhesive tape is tightly pressed on the outer ring of the thin-wall annular part through an adhesive tape attaching roller.

Furthermore, a sliding groove is formed in each station, and the first adhesive tape roller and the second adhesive tape roller are positioned on two sides of the sliding groove; the motor cabinet is arranged in the sliding groove, the air cylinder is arranged on the bottom surface of the station turntable near the station, the air cylinder drives the motor cabinet to move in the sliding groove, and the thin-wall annular part is attached to the black adhesive tape through the air cylinder.

Further, the width of the adhesive tape close to the roller is the same as that of the thin-wall annular part.

Further, 2 adjacent processing stations are arranged on the station turntable, the light path transmission system comprises a first light guide arm, a second light guide arm and a light path turn-back device, the first light guide arm and the second light guide arm are respectively arranged on the light path turn-back device, the light path turn-back device is used for dividing a laser beam generated by the laser generating device into two beams of laser, and the first beam of laser is input to the first processing station through the first light guide arm; and the second beam of laser is input to a second processing station through a second light guide arm.

Further, the difference value between the phase difference between the first processing station and the second processing station and the phase difference between the first light guide arm and the second light guide arm is 5-10 degrees; the center line of the first light guide arm and the center line of the second light guide arm are collinear with the center of the thin-wall annular part respectively.

A processing method of a laser shot peening strengthening device for a thin-wall annular part comprises the following steps:

grabbing a thin-wall annular part by an automatic loading and unloading manipulator, placing the thin-wall annular part on a pneumatic three-jaw chuck of a loading station, and pressing the pneumatic three-jaw chuck to clamp the inner ring of the thin-wall annular part; the motor base is driven by the cylinder to slide in the chute, and the pneumatic three-jaw chuck is driven to move forwards, so that the thin-wall annular part is attached to the black adhesive tape;

the station turntable is driven by the transmission mechanism to rotate the thin-wall annular part to a first processing station, so that the first light guide arm is aligned to the thin-wall annular part; simultaneously starting a laser generating device, a first rotating motor and a second rotating motor, inputting a first beam of laser into the outer ring of the thin-wall annular part through a first light guide arm, and performing laser shot peening; the second rotating motor drives the second adhesive tape winding drum to rotate, so that the black adhesive tape can be continuously replaced in the laser shot peening strengthening process;

the station turntable is driven by the transmission mechanism to rotate the thin-wall annular part to a second processing station, so that a second light guide arm is aligned to the thin-wall annular part; a second beam of laser is input into the outer ring of the thin-wall annular part through a second light guide arm and is used for laser shot peening strengthening of the non-overlapped part of the first processing station;

the station turntable is driven by the transmission mechanism to rotate the processed thin-wall annular part to a blanking station, and the motor base is driven by the cylinder to slide in the chute to drive the pneumatic three-jaw chuck to move backwards so that the thin-wall annular part is separated from the black adhesive tape; the pneumatic three-jaw chuck unloads atmospheric pressure, and the thin wall annular part that automatic feeding and discharging manipulator snatched the processing and accomplished leaves the processing region, puts into the collection box.

Further, when the station turntable is driven by the transmission mechanism to rotate to the first machining station, the second machining station or the discharging station, the feeding and discharging manipulator automatically picks the thin-wall annular part to be fed on the feeding station.

The invention has the beneficial effects that:

1. according to the laser shot peening strengthening device and the processing method for the thin-wall annular part, the black adhesive tape can be continuously replaced in the laser shot peening strengthening process through the automatic adhesive tape sticking device, and the laser shot peening strengthening effect is ensured; the phase difference between the first processing station and the second processing station is different from the phase difference between the first light guide arm and the second light guide arm, so that the full-coverage laser shot peening strengthening of the surface of the thin-wall annular part can be realized.

2. The laser shot peening strengthening device and the processing method for the thin-wall annular part can generate uniformly distributed residual compressive stress on the surface layer of the thin-wall annular part, change the microstructure and the mechanical property of the surface layer and prolong the fatigue life of the thin-wall annular part.

3. The laser shot peening strengthening device and the processing method for the thin-wall annular part have the advantages of high automation degree and high flexibility, and the processing efficiency is improved.

Drawings

FIG. 1 is an assembly diagram of the laser peening device for thin-wall ring parts according to the present invention.

Fig. 2 is a partially enlarged schematic view of a processing station according to the present invention.

FIG. 3 is a schematic diagram of a workholding system according to the present invention.

Fig. 4 is a schematic diagram of an internal structure of the optical path folding apparatus according to the present invention.

Fig. 5 is a movement locus of a laser spot of a first light guide arm processing station according to the present invention.

Fig. 6 is a movement locus of a laser spot of a second light guide arm processing station according to the present invention.

In the figure:

1-a frame; 2-station turntable; 3-an objective table; 4-a light path foldback device; 5-automatic feeding and discharging mechanical arm; 6-a laser generating device; 7-a second light guide arm; 8-a first light guide arm; 9-black tape; 10-a first tape roll; 11-pneumatic three-jaw chuck; 12-a cylinder; 13-a first rotating electrical machine; 14-a second rotating electrical machine; 15-a second tape roll; 16-the adhesive tape is tightly attached to the roller bracket; 17-the adhesive tape is tightly attached to the roller; 18-thin-walled annular parts; 19-a motor base; 20-flange plate; 21-a housing; 22-a beam splitting prism; 23-a first mirror; 24-a third mirror; 25-second mirror.

Detailed Description

The invention will be further described with reference to the following figures and specific examples, but the scope of the invention is not limited thereto.

Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are illustrative and intended to be illustrative of the invention and are not to be construed as limiting the invention.

In the description of the present invention, it is to be understood that the terms "central," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "axial," "radial," "vertical," "horizontal," "inner," "outer," and the like are used in the orientations and positional relationships indicated in the drawings for convenience in describing the present invention and for simplicity in description, and are not intended to indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and are not to be considered limiting. Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless specifically defined otherwise.

In the present invention, unless otherwise expressly specified or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can, for example, be fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.

As shown in figure 1, the laser shot peening strengthening device for the thin-wall annular part comprises a frame 1, a laser generating device 6, a light path transmission system, an automatic feeding and discharging manipulator 5 and a station turntable 2; the station turntable 2 is positioned on the rack 1 and can rotate under the drive of the transmission mechanism; the station turntable 2 comprises 2 processing stations, a feeding station and a discharging station; a workpiece clamp system and an automatic adhesive tape sticking device are arranged on each station of the station turntable 2;

the laser generating device 6 is arranged on the machine frame 1 and used for generating laser beams; the laser beams are distributed on a processing station through the optical path transmission system to carry out strengthening treatment on the thin-wall annular part 18; the ratio of the diameter to the wall thickness of the thin-walled annular part 18 is greater than 20. The automatic feeding and discharging manipulator 5 is used for grabbing thin-wall annular parts 18 at a feeding and discharging station;

the optical path transmission system comprises a first light guide arm 8, a second light guide arm 7 and an optical path turning device; the light path turning device is arranged on the objective table 3; the object stage 3 is positioned at the center of the station turntable 2, the included angle between the first light guide arm 8 and the second light guide arm 7 is 85 degrees, and meanwhile, the centers of the first light guide arm 8 and the second light guide arm 7 are parallel to the center of the thin-wall annular part 18; as shown in fig. 4, the optical path folding device includes a housing 21, a beam splitting prism 22, a first reflecting mirror 23, a second reflecting mirror 25, and a third reflecting mirror 24, and the beam splitting prism 22, the first reflecting mirror 23, the second reflecting mirror 25, and the third reflecting mirror 24 are located inside the housing 21. The laser beam is split into two laser beams by a laser beam after passing through the beam splitter prism 22, the first laser beam enters the first light guide arm 8 after passing through the first reflection mirror 23, and the second laser beam enters the second light guide arm 7 after passing through the second reflection mirror 25 and the third reflection mirror 24.

2 processing stations, a feeding station and a discharging station are uniformly distributed on the station turntable 2, namely the phase angle of the first processing station and the second processing station is 90 degrees. As shown in fig. 2 and 3, the work fixture system includes a pneumatic three-jaw chuck 11, a flange 20, a motor base 19, a first rotating motor 13, and a cylinder 12, the pneumatic three-jaw chuck 11 is mounted on the flange 20, the flange 20 is connected to the first rotating motor 13 through a transmission shaft, a chute is formed in each station, the motor base 19 is mounted in the chute, and the cylinder 12 is fixed to the bottom surface of the station turntable 2 and connected to the motor base 19. The cylinder 12 drives the motor mount 19 to move within the chute.

The automatic tape sticking device comprises a first tape reel 10, a second tape reel 15, a second rotating motor 14, a tape sticking roller 17 and a tape sticking roller bracket 16; the first adhesive tape roller 10 and the second adhesive tape roller 15 are symmetrically distributed on two sides of the sliding groove, the second adhesive tape roller 15 is connected with the second rotating motor 14, the adhesive tape close roller 17 is installed on a bracket 16 of the adhesive tape close roller, and the adhesive tape close roller bracket 16 is installed on the upper surface of the four-station turntable 2. The second rotating motor 14 is used for driving the second adhesive tape reel 15 to rotate, so that the black adhesive tape 9 is continuously replaced in the processing process of the thin-wall annular part 18; the black adhesive tape 9 is tightly pressed on the outer ring of the thin-wall annular part 18 by adhering the adhesive tape to a roller 17.

The processing stations of the station carousel 2 of the present invention are not limited to 4, but at least 2 processing stations. The difference value between the phase difference of the adjacent processing stations and the phase difference of the adjacent light guide arms is only required to be 5-10 degrees.

The invention relates to a processing method of a laser shot peening strengthening device for a thin-wall annular part, which comprises the following steps:

firstly, the automatic feeding and discharging manipulator 5 at the feeding station picks the thin-wall annular part 18 and places the thin-wall annular part on the pneumatic three-jaw chuck 11, the pneumatic three-jaw chuck 11 finishes clamping the thin-wall annular part 18 under the action of air pressure, and the air cylinder 12 pushes the motor base 19 to slide forwards to drive the pneumatic three-jaw chuck 11 and the thin-wall annular part 18 to move forwards, so that the thin-wall annular part 18 is attached to the black adhesive tape 9.

And secondly, the station turntable 2 rotates by 90 degrees to a first processing station where the first light guide arm 8 is located under the driving of the transmission mechanism, and the previous step is repeated at the feeding station. Adjusting various parameters of the laser generating device 6: the laser pulse width is 15ns, the laser wavelength is 1064nm, the laser energy is 6J, and the repetition frequency is 10Hz. And simultaneously starting the laser generating device 6, the first rotating motor 13 and the second rotating motor 14, and controlling the rotating speed of the first rotating motor 13 and the rotating speed of the second rotating motor 14 through programs so as to ensure that the non-overlap strengthening is realized when the thin-wall annular part 18 is strengthened by laser shot blasting, as shown in fig. 5. The second rotating motor 14 drives the second adhesive tape reel 15 to rotate, so that the black adhesive tape 9 can be continuously replaced in the laser shot peening process, and the laser shot peening effect is ensured. The tape attaching roller 17 is completely attached to the thin-walled annular part 18, so that the black tape 9 is closely attached to the thin-walled annular part 18 in the process of replacing.

And thirdly, after the thin-wall annular part 18 is strengthened for one circle at the processing position of the first light guide arm 8, suspending the laser generating device 6, the first rotating motor 13 and the second rotating motor 14. And the station turntable 2 rotates by 90 degrees, so that the thin-wall annular part 18 which is strengthened at the processing station of the first light guide arm 8 rotates to the second processing station where the second light guide arm 7 is positioned, meanwhile, the thin-wall annular part 18 which is not strengthened at the feeding station rotates to the first processing station where the first light guide arm 8 is positioned, and the first step is repeated again to complete feeding of the feeding station. Starting the laser generating device 6, the first rotating motor 13 and the second rotating motor 14 again, and completing laser shot peening strengthening of the non-overlapped part of the thin-wall annular part 18 at the processing position of the second light guide arm 7, as shown in fig. 6; and new laser shot peening without lap joint of the thin-wall annular part 18 is completed at the processing station of the first light guide arm 8.

And fourthly, repeating the steps to enable the thin-wall annular part 18 which is processed at the processing station of the second light guide arm 7 to rotate to a blanking station, enabling the air cylinder 12 to move backwards to drive the thin-wall annular part 18 to be separated from the black adhesive tape 9, enabling the pneumatic three-jaw chuck 11 to unload air pressure, enabling the automatic loading and unloading manipulator 5 to grab the processed thin-wall annular part 18 to leave the processing area, and placing the thin-wall annular part into a collecting box.

And fifthly, continuing to perform laser shot peening strengthening on the thin-wall annular part 18 according to the working steps, and then realizing automatic machining of the laser shot peening strengthened thin-wall annular part 18.

It should be understood that although the present description has been described in terms of various embodiments, not every embodiment includes only a single embodiment, and such description is for clarity purposes only, and those skilled in the art will recognize that the embodiments described herein may be combined as suitable to form other embodiments, as will be appreciated by those skilled in the art.

The above-listed detailed description is only a specific description of a possible embodiment of the present invention, and they are not intended to limit the scope of the present invention, and equivalent embodiments or modifications made without departing from the technical spirit of the present invention should be included in the scope of the present invention.

Claims

1. A laser shot peening strengthening device for thin-wall annular parts is characterized by comprising a laser generating device (6), a light path transmission system, an automatic feeding and discharging mechanical arm (5), a station turntable (2), a workpiece clamp system and an automatic adhesive tape sticking device;

the laser generating device (6) is used for generating laser beams; the station turntable (2) comprises at least 2 processing stations and a loading and unloading station; the automatic feeding and discharging manipulator (5) is used for grabbing the thin-wall annular part (18) at a feeding and discharging station; the laser beams are respectively emitted to the outer rings of the thin-wall annular parts (18) of the processing stations through the optical path transmission system and are used for strengthening treatment on the thin-wall annular parts (18); a workpiece clamp system and an automatic adhesive tape sticking device are arranged on each station of the station turntable (2); the workpiece clamp system is used for clamping the thin-wall annular part (18) and then enabling the thin-wall annular part (18) to rotate; the automatic adhesive tape sticking device is used for forming a constraint layer on the outer ring of the thin-wall annular part (18); the ratio of the diameter to the wall thickness of the thin-walled annular part (18) is greater than 20;

the station turntable (2) is provided with 2 adjacent processing stations, the light path transmission system comprises a first light guide arm (8), a second light guide arm (7) and a light path turning device, the first light guide arm (8) and the second light guide arm (7) are respectively arranged on the light path turning device, the light path turning device is used for dividing a laser beam generated by the laser generating device (6) into two beams of laser, and the first beam of laser is input to the first processing station through the first light guide arm (8); the second beam of laser is input to a second processing station through a second light guide arm (7); the difference value between the phase difference between the first processing station and the second processing station and the phase difference between the first light guide arm (8) and the second light guide arm (7) is 5-10 degrees; the central line of the first light guide arm (8) and the central line of the second light guide arm (7) are collinear with the center of the thin-wall annular part (18) respectively;

the automatic tape sticking device comprises a first tape winding drum (10), a second tape winding drum (15), a second rotating motor (14), a tape sticking roller (17) and a tape sticking roller bracket (16); the first adhesive tape winding drum (10) and the second adhesive tape winding drum (15) are symmetrically distributed on two sides of the station, a black adhesive tape (9) is arranged between the first adhesive tape winding drum (10) and the second adhesive tape winding drum (15), and the second rotating motor (14) is used for driving the second adhesive tape winding drum (15) to rotate, so that the black adhesive tape (9) is continuously replaced in the processing process of the thin-wall annular part (18); the black adhesive tape (9) is tightly pressed on the outer ring of the thin-wall annular part (18) through an adhesive tape tight-sticking roller (17); each station is provided with a sliding groove, and the first adhesive tape winding drum (10) and the second adhesive tape winding drum (15) are positioned on two sides of the sliding groove; the motor base (19) is located in the sliding groove, the air cylinder (12) is located on the bottom surface of the station rotating disc (2) near the station, the air cylinder (12) drives the motor base (19) to move in the sliding groove, and the thin-wall annular part (18) is attached to the black adhesive tape (9) through the air cylinder (12).

2. Laser peening apparatus for thin-walled ring parts according to claim 1, wherein the work holder system comprises a pneumatic three-jaw chuck (11), a flange (20), a motor mount (19) and a first rotating motor (13), the pneumatic three-jaw chuck (11) being mounted on the flange (20), the flange (20) being connected to the first rotating motor (13) via the motor mount (19) for rotating the pneumatic three-jaw chuck (11).

3. The laser peening apparatus for thin-walled annular parts according to claim 1, wherein the width of the tape abutment roller (17) is the same as the width of the thin-walled annular part.

4. A method for processing the thin-walled ring part laser peening apparatus according to claim 1, comprising the steps of:

grabbing a thin-wall annular part (18) by an automatic loading and unloading manipulator (5) and placing the thin-wall annular part on a pneumatic three-jaw chuck (11) of a loading station, and enabling the pneumatic three-jaw chuck (11) to clamp an inner ring of the thin-wall annular part (18) by pressurization; the motor seat (19) is driven by the cylinder (12) to slide in the chute, and the pneumatic three-jaw chuck (11) is driven to move forwards, so that the thin-wall annular part (18) is attached to the black adhesive tape (9);

the station turntable (2) rotates the thin-wall annular part (18) to a first processing station under the drive of the transmission mechanism, so that the first light guide arm (8) is aligned to the thin-wall annular part (18); simultaneously starting a laser generating device (6), a first rotating motor (13) and a second rotating motor (14), inputting a first beam of laser into the outer ring of the thin-wall annular part (18) through a first light guide arm (8) for laser shot peening strengthening; the second rotating motor (14) drives the second adhesive tape winding drum (15) to rotate, so that the black adhesive tape (9) can be continuously replaced with new one in the laser shot peening strengthening process;

the station turntable (2) rotates the thin-wall annular part (18) to a second processing station under the drive of the transmission mechanism, so that the second light guide arm (7) is aligned to the thin-wall annular part (18); a second beam of laser is input into the outer ring of the thin-wall annular part (18) through a second light guide arm (7) and is used for laser shot peening strengthening of the non-overlapped part of the first processing station;

the station turntable (2) is driven by a transmission mechanism to rotate the processed thin-wall annular part (18) to a blanking station, and a motor base (19) is driven by a cylinder (12) to slide in a chute to drive a pneumatic three-jaw chuck (11) to move backwards so that the thin-wall annular part (18) is separated from the black adhesive tape (9); the pneumatic three-jaw chuck (11) unloads air pressure, and the automatic feeding and discharging mechanical arm (5) grabs the processed thin-wall annular part (18) to leave a processing area and puts the thin-wall annular part into a collecting box.

5. The machining method of the laser shot peening strengthening device for the thin-wall annular parts as claimed in claim 4, wherein when the station turntable (2) is driven by the transmission mechanism to rotate to the first machining station or the second machining station or the blanking station, the feeding and blanking manipulator (5) automatically picks up the thin-wall annular parts (18) at the feeding station.