A laser shock peening device with a bidirectional controllable normal angle

Abstract

The present application discloses a laser shock peening device with a bidirectional controllable normal angle. The laser shock peening device includes a base, a laser shock peening tool unit, a laser transmission unit, a laser, a workpiece clamping unit, a constraint layer purification and loading unit, and a control unit; the workpiece clamping unit has N degrees of freedom of movement; the laser shock peening tool unit is fixed with five degrees of freedom of movement; the laser transmission unit has a rotational degree of freedom. The present application solves the problems that existing equipment cannot perform optimal double-sided impact on parts and single-sided impact is prone to cause warping deformation in the case where the normal directions of the two sides of thin-walled curved parts are not collinear, and has good accessibility in narrow spaces.

Description

Technical Field

[0001] The present application relates to a laser shock peening device with a bidirectional controllable normal angle, belonging to the technical field of laser shock peening. Background Art

[0002] Laser shock peening uses high-intensity laser-induced plasma shock waves to impact and process parts, and has been widely used in the improvement of the anti-fatigue and corrosion resistance of key components in the fields of aviation, aerospace, nuclear energy, etc., with remarkable effects. Existing laser shock peening equipment includes a laser generation unit, an absorption protection layer on the surface of the workpiece, a confinement layer on the surface of the absorption protection layer, and a workpiece clamping unit, etc. The role of the confinement layer is to allow the laser energy to pass through and act on the absorption protection layer, and at the same time provide as much reaction force as possible during the expansion of the plasma to improve the coupling efficiency of the shock wave. Currently, a 0.5 - 2 mm thick side-fed flowing water film is generally used as the transparent confinement layer at home and abroad. The role of the absorption protection layer is to absorb laser energy, generate plasma, and at the same time avoid damage to the workpiece by the laser and plasma. Currently, paint, flexible tape, or metal foil with a certain thickness, etc. are generally used as the absorption protection layer. The role of the workpiece clamping unit is to clamp the workpiece during the laser shock process and perform a certain degree of freedom movement within a specified stroke to complete the shock of the corresponding area on the workpiece.

[0003] The process of such laser shock peening is as Figure 1 shown: A short pulse (generally within 50 nanoseconds) and high power density (GW / cm 2 ) laser passes through the transparent confinement layer formed by side-fed water and acts on the absorption protection layer coated or attached to the surface of workpieces such as metals. After the absorption protection layer absorbs the laser energy, it quickly vaporizes to form a dense high-temperature and high-pressure plasma. The plasma continues to absorb the laser energy and then rapidly heats up and expands to form a shock wave. The intensity of the shock wave can reach several GPa (109 Pa) order of magnitude, which is much higher than the yield strength of many metal materials; the shock wave passes through the absorption protection layer, acts on the surface of the workpiece and propagates into its interior, causing plastic deformation and residual compressive stress fields on the surface of the workpiece, resulting in an increase in the dislocation density of the surface layer material, grain refinement, and hardness increase, thereby significantly improving the anti-fatigue, anti-wear, and anti-corrosion properties of the material.

[0004] Patents such as CN105862046B "Device for surface strengthening of aero-engine parts", CN113088677B "Water confinement layer device for laser shock peening technology and its measurement method", and CN103882188B "Integral blisk laser shock peening equipment" all use the method of keeping the laser shock peening tool head stationary and the manipulator clamping the workpiece to move to complete surface strengthening. CN216566580U "A five-axis machine tool type laser shock peening equipment" adopts a five-axis machine tool type laser shock peening method. The X-axis, Y-axis, and C-axis drive the movement and rotation of the workpiece (the workpiece has three degrees of freedom), and the Z-axis and B-axis drive the movement and rotation of the laser shock peening tool head (the laser shock peening tool head has two degrees of freedom). This structure is suitable for single-sided impact. However, during single-sided impact, the workpiece is affected by the single-sided impact force and is prone to unidirectional plastic deformation. Cumulatively, it macroscopically shows warping deformation of the workpiece, as shown in Figure 2 shown.

[0005] To reduce or avoid the adverse warping deformation generated during single-sided impact, a double-sided impact method can be adopted. For example, CN104862468B "Method for improving the life of turbine blades based on laser double-sided impact technology", CN106702137B "A method for double-sided synchronous laser shock peening of the leading edge of a turbine blade", and CN103894735B "Integral blisk single / double-sided laser shock peening optical path system". However, during the process of double-sided impact on complex curved parts, since the normal vectors on both sides of the curved surface are not necessarily collinear, the laser spot sizes are inconsistent, and the laser power densities generated by the same laser pulse energy are different, resulting in uneven impact effects on both sides. As shown in Figure 3, the optimal laser shock peening effect cannot be achieved. CN106702137B "A method for double-sided synchronous laser shock peening of the leading edge of a turbine blade" uses two laser beams with the same diameter and different pulse energies for synchronous impact on the front and back. This method requires calculating the required pulse energy according to the angle between the normal vector of the curved surface at the impact point and the laser incident direction, and adjusting the pulse energy of the optical paths on both sides in real time during the impact process. The workload of pre-processing the model is large, and the requirements for the control system are relatively high. In addition, in some cases, special inclination impact treatment is required. For example, when realizing special micro-textures through laser shock, the normal direction may not be the optimal. The ability of two-way laser shock peening along any normal angle has not been found yet. In more complex cases, the two-way impact of complex thin-walled components needs to simultaneously solve the accessibility problem of narrow parts. In many cases, two-way impact along the normal direction of narrow parts is unrealistic. For example, for the twisted part of the integral blisk of an aero-engine, if the treatment part can be reached and the impact treatment with the minimum deformation can be realized, the blade performance will be further improved. In short, the industry needs a method and equipment that can take into account accessibility and can perform two-way laser shock peening along any normal angle. Summary of the Invention

[0006] The object of the present invention is to provide a laser shock peening device with controllable normal double-sided impact in view of the deficiencies of the existing laser shock peening technology. This device has the function of modulating the optimal normal angle of laser shock. Therefore, during the processing, the direction of the laser shock peening tool head can be adjusted at any time to cooperate with the movement of the workpiece, realizing the double-sided controllable optimal normal angle impact of complex surface parts. In particular, it can solve the problem that when the normal vectors on both sides of a complex surface part are not collinear, single-sided impact is likely to cause warping deformation and the traditional double-sided impact effect is not ideal, providing new engineering optimization degrees of freedom for laser shock peening.

[0007] In one aspect of the present application, a laser shock peening device with a bidirectional controllable normal angle is provided. The laser shock peening device includes a base, a laser shock peening tool unit, a laser transmission unit, a laser, a workpiece clamping unit, a constraint layer purification and loading unit, and a control unit;

[0008] The workpiece clamping unit is fixed on the base and is used for clamping the workpiece to be processed. The workpiece clamping unit has N degrees of freedom of movement;

[0009] The laser shock peening tool unit is fixed on the base and has five degrees of freedom of movement;

[0010] The laser transmission unit is connected to the laser shock peening tool unit and is used for vertically incident the laser on the laser shock peening tool unit; the laser transmission unit has a rotational degree of freedom;

[0011] The laser is used to emit laser, which is vertically incident on the laser shock peening tool unit through the laser transmission unit;

[0012] The constraint layer purification and loading unit is connected to the laser shock peening tool unit and is used for purifying and spraying the constraint layer;

[0013] The control unit is used to control the laser emission of the laser, control the spraying of the constraint layer by the constraint layer purification and loading unit, control the movement of the workpiece clamping unit for clamping the workpiece to be processed, and control the movement of the laser shock peening tool unit.

[0014] Optionally, N is an integer from 0 to 5.

[0015] Optionally, when N is 5, the workpiece clamping unit has three translational degrees of freedom and two rotational degrees of freedom.

[0016] Optionally, the workpiece clamping unit has five degrees of freedom. The Y-axis is mounted on the base, the X-axis is mounted on the Y-axis, the Z-axis is mounted on the X-axis, the B-axis is mounted on the Z-axis and can rotate around the Y-axis direction, and the C-axis is mounted on the B-axis and can rotate around the Z-axis direction. The five-axis device has three translational degrees of freedom and two rotational degrees of freedom, including but not limited to the combination forms of X, Y, Z, B, and C.

[0017] Optionally, the laser shock peening tool unit includes a laser shock peening tool head and a carrier platform;

[0018] The carrier platform is fixed on the base and is used to carry the laser shock peening tool head; the carrier platform has five degrees of freedom of movement in five directions;

[0019] The laser transmission unit vertically irradiates the laser onto the laser shock peening tool head.

[0020] Optionally, the carrier platform has three translational degrees of freedom and two rotational degrees of freedom.

[0021] Optionally, the carrier platform includes the moving axes of the X-axis, Y-axis, and Z-axis and their slide rails, the B-axis that rotates around the Y-axis, and the C-axis that rotates around the Z-axis. The movement of the X-axis, Y-axis, and Z-axis brings about the adjustment of the position of the laser shock peening tool head. The position adjustment between the laser and the tool head can be achieved through a telescopic dust-proof tube. The change in the angle of the tool head brought about by the rotation of the B-axis and C-axis can adjust the angle of the reflecting mirror through a rotating joint, so as to ensure that the laser vertically irradiates the tool head. By adjusting the angle of the laser shock peening tool head, double-sided controllable normal impact can be achieved when the normal vectors on both sides of the curved surface part are not collinear. This system includes but is not limited to the forms of X, Y, Z, B, and C. Two manipulators can also be used to clamp the tool head, as Figure 9 shown.

[0022] Optionally, the laser transmission unit is connected to the laser shock peening tool head;

[0023] The constraint layer purification loading unit is connected to the laser shock peening tool head.

[0024] Optionally, the laser transmission unit is composed of a telescopic dust-proof tube, a rotating joint, a beam splitter, and a reflecting mirror;

[0025] The rotating joint is connected to the telescopic dust-proof tube, and the rotating joint is provided with a reflecting mirror seat;

[0026] The rotating joint has a rotational degree of freedom relative to the telescopic dust-proof tube. The axis of rotation of the rotating joint is parallel to the rotation direction of the laser shock peening tool head, and the angle of the reflecting mirror can be adjusted to adapt to the rotation angle of the laser shock peening tool head, ensuring that the laser vertically irradiates the tool head;

[0027] The beam splitter and the reflector are arranged on the optical path of the laser;

[0028] The telescopic dust-proof tube is connected to the rotating joint. By adjusting the telescopic state of the telescopic dust-proof tube, the axial distance between the rotating joints connected at both ends of the dust-proof tube can be adjusted, so as to adjust the distance between the mirror mounts provided on the rotating joints, achieving the effect of adjusting the distance between the reflectors.

[0029] Optionally, the laser beam emitted by the laser is guided to the beam splitter by the reflector, and the laser beam is divided into two beams of light with equal energy or a specified energy ratio, and is guided to the laser shock peening tool heads on both sides by the reflector.

[0030] Optionally, the rotation axis of the rotating joint is parallel to the rotation direction of the laser shock peening tool head to adapt to the rotation angle of the tool head and ensure that the laser is perpendicularly incident on the tool head.

[0031] Optionally, the telescopic dust-proof tube can drive the reflector to translate to adapt to the position change caused by the movement of the laser shock peening tool head.

[0032] Optionally, the laser shock peening tool head is composed of a focusing module, a focusing adjustment module, a window protection sheet, a constraint layer inlet, a cavity, and a nozzle arranged in sequence along the laser optical path;

[0033] The constraint layer purification and loading unit is connected to the constraint layer inlet;

[0034] The laser transmission unit vertically irradiates the laser onto the focusing module.

[0035] Optionally, the laser shock peening tool head is an optical-water coaxial device, including a focusing adjustment module, a focusing mirror, a window protection lens, a constraint layer inlet, and a nozzle. After the laser beam enters the tool head, it is focused by the focusing mirror, passes through the window protection sheet, enters the cavity filled with the constraint layer, and the laser is transmitted in the steady-state constraint layer and is ejected from the nozzle together with the water constraint layer to act on the surface of the specimen. The focusing adjustment module can adjust the position of the focusing mirror within a certain range, thereby adjusting the position of the laser focus.

[0036] Optionally, the constraint layer purification and loading unit includes a constraint layer purification module, a pressurization module, and a constraint layer pipeline connected in sequence;

[0037] The constraint layer pipeline is communicated with the constraint layer inlet.

[0038] Optionally, the medium of the constraint layer is water.

[0039] Optionally, the constraint layer purification module can increase the resistivity of the water constraint layer and reduce the risk of the laser breaking down the water.

[0040] Optionally, the pressurization module is an adjustable booster pump, which adjusts the water pressure value according to the inner cavity structure, so that the water after pressurization is in a stable laminar flow structure, facilitating the stable transmission of the laser in the water.

[0041] Optionally, after the constraint layer (the common medium is deionized water) is purified by the constraint layer purification module, it is pressurized by the pressurization module and enters the cavity of the laser shock peening tool head through the constraint layer pipeline. The laser and the constraint layer converge and are coaxial transmitted in the cavity, and are ejected from the nozzle, and act together on the surface of the workpiece to be processed. The constraint layer enters a cavity with a specific structure after pressurization and then is ejected from the nozzle. At this time, the constraint layer is in a stable laminar flow state, so as to facilitate the stable transmission of the laser in the constraint layer.

[0042] Optionally, the laser transmission unit includes a laser transmission medium;

[0043] The laser transmission medium is an optical fiber. As Figure 9 shown.

[0044] Optionally, the control unit can send control instructions to the laser, the constraint layer loading unit, the laser shock peening tool head bearing unit, and the workpiece clamping unit, control the opening and closing actions of the laser and the constraint layer loading unit, and control the coordinated movement of the laser shock peening tool head bearing unit and the workpiece clamping unit to realize the automation of the entire impact process.

[0045] The beneficial effects that can be produced by this application include:

[0046] The workpiece clamping unit adopted in this application is composed of a motion unit with multiple degrees of freedom; the laser emitted by the laser passes through the laser transmission unit and is transmitted to the laser shock peening tool heads on both sides of the workpiece. The tool heads on both sides are installed on the motion unit with multiple degrees of freedom and have five-axis positioning and linkage functions. The laser shock peening tool head is a laser shock peening device based on coaxial water delivery. The water flow is pressurized and then transported to the inner cavity of the tool head, and is coaxial transmitted with the laser and acts on the surface of the workpiece to form a dynamic constraint of the laser shock wave. The integrated control unit controls the movement of the workpiece and the laser shock peening tool head, and at the same time controls the opening and closing of the laser and the water flow to complete the double-sided laser shock peening treatment with the optimal normal angle. This application solves the problem that existing equipment cannot perform double-sided optimal impact on parts and single-sided impact is likely to cause warping deformation in the case where the normal directions of the two sides of thin-walled curved parts are not collinear, and has good accessibility in narrow spaces. Description of the Drawings

[0047] Figure 1 is a schematic diagram of the existing laser shock peening treatment process;

[0048] Figure 2 is a schematic diagram of warping deformation caused by single-sided impact;

[0049] Figure 3 is a schematic diagram of double-sided impact. Among them, Figure 3A is a schematic diagram of the problems existing in double-sided simultaneous impact when the normal lines on both sides are not collinear; Figure 3B is a schematic diagram of double-sided impact at an arbitrary normal angle;

[0050] Figure 4 is a schematic diagram of the overall structure of the laser shock peening device with a bidirectionally controllable normal angle in the embodiment of the present application;

[0051] Figure 5 is a detailed diagram of the workpiece clamping unit in the laser shock peening device with a bidirectionally controllable normal angle in the embodiment of the present application;

[0052] Figure 6 is an enlarged view of the laser transmission unit in the laser shock peening device with a bidirectionally controllable normal angle in the embodiment of the present application ( Figure 4 partial enlarged view of A in it);

[0053] Figure 7 is an enlarged view of the bearing unit in the laser shock peening device with a bidirectionally controllable normal angle in the embodiment of the present application ( Figure 4 partial enlarged view of B in it);

[0054] Figure 8 is a detailed diagram of the laser shock peening tool head in the laser shock peening device with a bidirectionally controllable normal angle in the embodiment of the present application;

[0055] Figure 9 is a schematic diagram of a deformation application of the laser shock peening device with a bidirectionally controllable normal angle in the embodiment of the present application.

[0056] Among them:

[0057] 1. Equipment base; 2. Laser shock peening tool head bearing unit; 3. Laser shock peening tool head; 4. Laser transmission unit; 5. Laser; 6. Workpiece clamping unit; 7. Constraint layer purification and loading unit; 8. Integrated control unit; 9. Optical fiber; 10. Workpiece; 11. Manipulator;

[0058] 2-1. Y-axis of the laser shock peening tool head bearing unit; 2-2. X-axis of the laser shock peening tool head bearing unit; 2-3. Z-axis of the laser shock peening tool head bearing unit; 2-4. B-axis of the laser shock peening tool head bearing unit; 2-5. C-axis of the laser shock peening tool head bearing unit;

[0059] 3-1. Focusing mirror; 3-2. Focus adjustment module; 3-3. Window protection lens; 3-4. Constraint layer inlet; 3-5. Inner cavity (filled with water constraint layer); 3-6. Nozzle;

[0060] 4-1, Telescopic dust-proof tube; 4-2, Rotating joint; 4-3, Mirror base; 4-4, Beam splitter; 4-5, Reflecting mirror;

[0061] 6-1, Y-axis of the workpiece clamping unit; 6-2, X-axis of the workpiece clamping unit; 6-3, Z-axis of the workpiece clamping unit; 6-4, C-axis of the workpiece clamping unit; 6-5, B-axis of the workpiece clamping unit;

[0062] 7-1, Constraint layer purification device; 7-2, Constraint layer pressurizing device; 7-3, Constraint layer transmission device.

[0063] A1, Manipulator; A2, Workpiece; A3, Absorbing protective layer; A4, Constraint layer; A5, Laser; A6, Laser beam; A7, Reflecting mirror; A8, Focusing mirror; A9, Constraint layer device.

[0064] B1, Workpiece; B2, Absorbing protective layer; B3, Circular light spot; B4, Elliptical light spot; B5, Laser beam; B6, Constraint layer. Detailed implementation manners

[0065] The present application will be described in detail below with reference to embodiments, but the present application is not limited to these embodiments.

[0066] Embodiment 1

[0067] As Figure 4 shown, a laser shock peening device with a bidirectional controllable normal angle includes an equipment base 1, a laser shock peening tool head bearing unit 2, a laser shock peening tool head 3, a laser transmission unit 4, a laser 5, a workpiece clamping unit 6, a constraint layer purification and loading unit 7, and an integrated control unit 8.

[0068] The laser transmission unit 4 is a device that transmits the laser emitted by the laser 5 to the laser shock peening tool head 2. As Figure 4 , 6 shown, it includes a telescopic dust-proof tube 4-1, a rotating joint 4-2, a mirror base 4-3, a beam splitter 4-4, and a reflecting mirror 4-5. In this embodiment, the selected beam splitter is a semi-transparent and semi-reflective mirror. When the laser passes through the semi-transparent and semi-reflective mirror, half of the laser energy is reflected into one optical path, and the other half of the laser energy passes through the lens to form another optical path, realizing the splitting of the laser beam. The rotating joint 4-2 is connected to the telescopic dust-proof tube at both ends and is provided with a mirror base 4-3 inside. The rotation axes of the rotating joint 4-2 are parallel to the rotation axes of the B-axis and C-axis of the laser shock peening tool head bearing unit 2 to ensure that the laser is perpendicularly incident on the laser shock peening tool head 3.

[0069] The workpiece clamping unit 6 is a device that clamps the workpiece to realize the five-axis linkage function. As Figure 5As shown in the figure, the Y-axis 6-1 is installed on the base 1, the X-axis 6-2 is installed on the Y-axis, the Z-axis 6-3 is installed on the X-axis, the B-axis 6-5 is installed on the Z-axis, the C-axis 6-4 is installed on the B-axis, and the workpiece and fixture are installed on the C-axis.

[0070] The laser shock peening tool head bearing unit 2 is a device that bears the laser shock peening tool head 3 to achieve five-axis movement. As Figure 7 shown in the figure, the Y-axis 2-1 slide rail is installed on the base, the X-axis 2-2 is installed on the Y-axis, the Z-axis 2-3 is installed on the X-axis, the B-axis 2-4 is installed on the Z-axis, the C-axis 2-5 is installed on the B-axis, and the laser shock peening tool head 3 is installed on the C-axis.

[0071] The laser shock peening tool head 3 adopts the coaxial transmission mode of laser and water confinement layer. As Figure 8 shown in the figure, the confinement layer is loaded into the inner cavity 3-5 of the tool head at the confinement layer inlet 3-4 of the tool head. A window protection lens 3-3 is provided in front of the inner cavity 3-5 to isolate the focusing lens 3-1 from the water cavity. A nozzle 3-6 is connected behind the inner cavity 3-5. The laser and the water confinement layer are simultaneously emitted from the nozzle 3-6 and act on the surface of the specimen. The focusing module 3-2 can adjust the front and back positions of the focusing lens within a certain range, so that the distance between the laser focus and the nozzle outlet can be adjusted according to the size of the workpiece.

[0072] The confinement layer purification and loading unit 7, as Figure 8 shown in the figure, includes a confinement layer purification device 7-1, a confinement layer pressurization device 7-2, and a confinement layer transmission device 7-3. In this embodiment, the confinement layer purification device 7-1 is a ultrapure water machine, and the resistivity of the output ultrapure water > 15 MΩ, which can effectively prevent the water from being broken down when the laser power density is large. The confinement layer pressurization device 7-2 is an adjustable booster pump, and the water pressure value is adjusted according to the inner cavity structure, so that the water after pressurization is in a stable laminar flow structure, which is convenient for the stable transmission of the laser in water and reduces the loss of laser energy. The confinement layer transmission device 7-3 is connected to the confinement layer inlet 3-4.

[0073] The integrated control system 8 controls the switches of the laser, the confinement layer loading and purification unit 7, and controls the movements of the laser shock peening tool head bearing unit 2 and the workpiece clamping unit 6.

[0074] The above are only several embodiments of the present application, and do not impose any form of limitation on the present application. Although the present application is disclosed above with preferred embodiments, it is not intended to limit the present application. Any person skilled in the art, without departing from the scope of the technical solution of the present application, makes some changes or modifications using the technical content disclosed above, which are all equivalent to equivalent implementation cases and fall within the scope of the technical solution.

Claims

1. A laser shock peening device with a bidirectional controllable normal angle, characterized in that the laser shock peening device includes a base, a laser shock peening tool unit, a laser transmission unit, a laser, a workpiece clamping unit, a constraint layer purification and loading unit, and a control unit; the workpiece clamping unit is fixed on the base, and the workpiece clamping unit has three translational degrees of freedom and two rotational degrees of freedom; the laser shock peening tool unit is fixed on the base and includes a laser shock peening tool head and a bearing platform; the laser shock peening tool head is a laser shock peening device based on coaxial water delivery. After the water flow is pressurized, it is delivered to the inner cavity of the tool head and transmitted coaxially with the laser to act on the surface of the workpiece, forming a dynamic constraint of the laser shock wave; the bearing platform is fixed on the base and is used to bear the laser shock peening tool head; the bearing platform has five degrees of freedom of movement in five directions, and is used to adjust the angle of the laser shock peening tool head to achieve double-sided controllable normal impact when the normal vectors on both sides of the curved part are not collinear; the laser transmission unit is connected to the laser shock peening tool unit and is used to vertically incident the laser on the laser shock peening tool heads on both sides of the workpiece; the laser transmission unit has a rotational degree of freedom; the laser is used to emit laser light, and the laser light is vertically incident on the laser shock peening tool unit through the laser transmission unit; the constraint layer purification and loading unit is connected to the laser shock peening tool unit and is used to purify and spray the constraint layer; the control unit is used to control the laser output of the laser, control the spraying of the constraint layer by the constraint layer purification and loading unit, control the movement of the workpiece clamping unit to clamp the workpiece to be processed, and control the movement of the laser shock peening tool unit; the laser transmission unit is composed of a telescopic dust-proof tube, a rotating joint, a beam splitter, and a mirror; the rotating joint is connected to the telescopic dust-proof tube, and the rotating joint is provided with a mirror holder; the rotating joint has a rotational degree of freedom relative to the telescopic dust-proof tube, and the rotation axis of the rotating joint is parallel to the rotation direction of the laser shock peening tool head; the beam splitter and the mirror are arranged on the optical path of the laser.

2. The laser shock peening device according to claim 1, characterized in that the bearing platform has three translational degrees of freedom and two rotational degrees of freedom.

3. The laser shock peening device according to claim 1, characterized in that the laser transmission unit is connected to the laser shock peening tool head; the constraint layer purification and loading unit is connected to the laser shock peening tool head.

4. The laser shock peening device according to claim 1, characterized in that the laser shock peening tool head is composed of a focusing module, a focusing adjustment module, a window protection sheet, a constraint layer inlet, a cavity, and a nozzle arranged in sequence along the laser optical path; the constraint layer purification and loading unit is connected to the constraint layer inlet; the laser transmission unit vertically incident the laser on the focusing module.

5. The laser shock peening device according to claim 4, characterized in that the constraint layer purification and loading unit includes a constraint layer purification module, a pressurization module, and a constraint layer pipeline connected in sequence. The constrained layer pipeline is communicated with the constrained layer inlet.

6. The laser shock strengthening device according to claim 1, wherein the laser transmission unit includes a laser transmission medium; the laser transmission medium is an optical fiber.

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