Underwater laser shock peening device and method for movable optical fiber connection

Abstract

The invention relates to the technical field of laser shock peening, and discloses a movable optical fiber connection underwater laser shock peening device and method.The device comprises a water tank, a clamping block is fixed to the inner end of an electric telescopic rod, and a supporting plate is fixed to one inner wall of the water tank; the lower side of the supporting plate is connected with an optical fiber laser head through an electric telescopic column, a nanosecond pulse laser is fixed to one side of the water tank, and the nanosecond pulse laser is connected with the optical fiber laser head through an optical fiber line. According to the underwater laser shock peening device connected with the movable optical fibers, the movable optical fibers are adopted for laser conduction, so that laser shock peening does not need to control movement of a workpiece only through a mechanical arm any more, and therefore laser spots work at the corresponding positions of the workpiece; therefore, movement in three directions can be disassembled to two parts, namely the laser and the movable platform, so that laser shock peening can be carried out in more occasions.

Description

Technical Field

[0001] The present invention relates to the technical field of laser shock peening, and particularly to a movable fiber - connected underwater laser shock peening device and method. Background Technique

[0002] Laser shock peening technology is a process applied in the field of surface engineering. That is, pulsed high - power laser beams are used to generate residual stresses in materials to improve the wear resistance of the material surface (such as wear resistance and fatigue resistance), or to increase the strength of thin cross - sections of materials to enhance the surface hardness of the material. It is a surface strengthening process applicable to various key components.

[0003] Currently, generally speaking, laser shock peening technology still relies on a simple robotic arm to control the movement of the fixture to achieve the relative movement of the workpiece with respect to the laser. This method greatly limits the processing of workpieces. It is necessary to ensure that there is a certain movable space in the X, Y, and Z axes directions of the robotic arm, and it is not suitable for underwater operations. Summary of the Invention

[0004] The purpose of the present invention is to provide a movable fiber - connected underwater laser shock peening device and method to solve the problem proposed in the above - mentioned background technique that currently, generally speaking, laser shock peening technology still relies on a simple robotic arm to control the movement of the fixture to achieve the relative movement of the workpiece with respect to the laser. This method greatly limits the processing of workpieces. It is necessary to ensure that there is a certain movable space in the X, Y, and Z axes directions of the robotic arm, and it is not suitable for underwater operations.

[0005] To achieve the above - mentioned purpose, the present invention provides the following technical solution: A movable fiber - connected underwater laser shock peening device and method, including a water tank. A first slide rail is fixed inside the water tank, and a first slider is slidably connected inside the first slide rail. The top of the first slider is fixed with a second slide rail, and a second slider is slidably connected inside the second slide rail. The top of the second slider is fixed with an XY moving platform. An electric telescopic rod is fixed outside the XY moving platform, and a clamping block is fixed at the inner end of the electric telescopic rod.

[0006] A support plate is fixed on an inner wall of the water tank, and a fiber laser head is connected to the lower side of the support plate through an electric telescopic column. A nanosecond pulsed laser is fixed on one side of the water tank, and the nanosecond pulsed laser is connected to the fiber laser head through a fiber optic cable.

[0007] Preferably, a control panel is fixed on the front side of the water tank, and a water outlet valve is fixed on one side of the water tank.

[0008] Preferably, the control panel includes an industrial computer and a PLC. The industrial computer is used for scheduling and managing various internal components or sub-devices, and the PLC realizes the control and monitoring of various devices and processes through programming.

[0009] Preferably, a first motor is fixed on one side of the first slide rail, and the output end of the first motor is connected to the first lead screw. The first lead screw is threadedly connected to the first slider.

[0010] Preferably, a second motor is fixed on one side of the second slide rail, and the output end of the second motor is connected to the second lead screw. The second lead screw is threadedly connected to the second slider.

[0011] Preferably, four electric telescopic rods are provided, and the four electric telescopic rods are circumferentially and evenly distributed on the XY moving platform.

[0012] Preferably, a condenser lens is fixed inside the fiber laser head, and a water inlet is provided on one side of the fiber laser head.

[0013] Preferably, the nanosecond pulse laser is a low-energy laser, the laser energy is less than 1J, and the wavelength is 532nm.

[0014] A method for underwater laser shock peening with movable fiber connection includes the following steps: S1. The water tank is used for storing water. The workpiece is placed on the XY moving platform and clamped and fixed by four clamping blocks. The XY moving platform can move back and forth, left and right, so as to realize the planar movement of the workpiece. S2. According to the diameter of the required laser spot, the height of the fiber laser head is adjusted by using the electric telescopic column, so as to adjust the height of the fiber laser head from the workpiece to be processed, thereby ensuring the accuracy of the spot diameter. S3. According to the requirements of laser shock peening for the workpiece, the program of the XY moving platform is compiled, and then the underwater laser shock peening operation can be started.

[0015] Compared with the prior art, the beneficial effects of the present invention are: For the underwater laser shock peening device with movable fiber connection, the movable fiber is adopted as the laser conduction mode, so that the laser shock peening no longer only relies on the robotic arm to control the movement of the workpiece to make the laser spot work at the corresponding position of the workpiece. In this way, the movement in three directions can be disassembled into two components, namely the laser and the movable platform, so that the laser shock peening can work in more situations. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a three-dimensional structural schematic diagram of the present invention; Figure 2Schematic diagram of the connection structure of the first slide rail, the first motor, the first lead screw, the first slider, the second slide rail, the second motor, the second lead screw and the second slider of the present invention; Figure 3 Schematic diagram of the connection structure of the first slide rail, the first motor, the second slide rail, the second motor, the second slider, the XY moving platform, the electric telescopic rod and the clamping block of the present invention.

[0017] In the figure: 1. Water tank; 2. Control panel; 3. Water outlet valve; 4. First slide rail; 5. First motor; 6. First lead screw; 7. First slider; 8. Second slide rail; 9. Second motor; 10. Second lead screw; 11. Second slider; 12. XY moving platform; 13. Electric telescopic rod; 14. Clamping block; 15. Support plate; 16. Electric telescopic column; 17. Fiber laser head; 18. Water inlet; 19. Nanosecond pulse laser; 20. Fiber optic cable. Specific embodiments

[0018] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0019] Please refer to Figures 1 - 3 , the present invention provides a technical solution: a movable underwater laser shock strengthening device with fiber optic connection, including a water tank 1. A first slide rail 4 is fixed inside the water tank 1. A first slider 7 is slidably connected inside the first slide rail 4. A second slide rail 8 is fixed on the top of the first slider 7. A second slider 11 is slidably connected inside the second slide rail 8. An XY moving platform 12 is fixed on the top of the second slider 11. An electric telescopic rod 13 is fixed on the outside of the XY moving platform 12. A clamping block 14 is fixed at the inner end of the electric telescopic rod 13.

[0020] A support plate 15 is fixed on an inner wall of the water tank 1. The lower side of the support plate 15 is connected to a fiber laser head 17 through an electric telescopic column 16. A nanosecond pulse laser 19 is fixed on one side of the water tank 1. The nanosecond pulse laser 19 is connected to the fiber laser head 17 through a fiber optic cable 20.

[0021] In this embodiment, as Figure 1 shown, a control panel 2 is fixed on the front side of the water tank 1, and a water outlet valve 3 is fixed on one side of the water tank 1. The water tank 1 can be used to store water. Opening the water outlet valve 3 can drain the water in the water tank 1.

[0022] In this embodiment, as Figure 1As shown, the control panel 2 includes an industrial computer and a PLC. The industrial computer is used to schedule and manage various internal components or sub-devices. The PLC realizes the control and monitoring of various devices and processes through programming. The electric telescopic rod 13 and the clamping block 14 are combined to form a fixture. The industrial computer and the PLC coordinate to complete the parameter setting and communication control of the fixture, the XY two-dimensional motion platform, etc., so as to realize the laser shock peening along the specified route.

[0023] In this embodiment, as Figure 2 shown, a first motor 5 is fixed on one side of the first slide rail 4, and the output end of the first motor 5 is connected to the first lead screw 6. The first lead screw 6 is threadedly connected to the first slider 7. The first lead screw 6 can rotate under the action of the first motor 5. At this time, the first slider 7 can slide back and forth under the action of the first slide rail 4 and the first lead screw 6, thereby driving the second slide rail 8, the second slider 11 and the XY moving platform 12 to move back and forth as a whole.

[0024] In this embodiment, as Figure 2 shown, a second motor 9 is fixed on one side of the second slide rail 8, and the output end of the second motor 9 is connected to the second lead screw 10. The second lead screw 10 is threadedly connected to the second slider 11. The second lead screw 10 can rotate under the action of the second motor 9. At this time, the second slider 11 can slide left and right under the limiting action of the second slide rail 8 and the second lead screw 10, thereby driving the second slider 11 and the XY moving platform 12 to slide left and right as a whole.

[0025] In this embodiment, as Figure 1 and Figure 3 shown, four electric telescopic rods 13 are provided, and the four electric telescopic rods 13 are circumferentially and uniformly distributed on the XY moving platform 12. The clamping block 14 can move under the extension action of the electric telescopic rod 13, and the four clamping blocks 14 gather together to facilitate clamping and fixing of the workpiece.

[0026] In this embodiment, as Figure 1 shown, a condenser lens is fixed inside the fiber laser head 17, and a water inlet 18 is provided on one side of the fiber laser head 17. The condenser lens is used to converge the laser energy of different beams emitted by the nanosecond pulsed laser 19 into the same laser beam. The water inlet 18 is used to more accurately apply the water medium to the laser shock peening surface, so that the laser energy can better pass through the medium layer and be converted into high-quality shock waves.

[0027] In this embodiment, as Figure 1 shown, the nanosecond pulsed laser 19 is a low-energy laser, the laser energy is less than 1J, and the wavelength is 532nm. The fiber laser conduction enables the fiber laser head 17 to move, so as to achieve that the spot diameter can be controlled by following the height-adjustable fixture in the Z-axis direction.

[0028] According to another aspect of the present invention, there is provided an underwater laser shock strengthening method with movable optical fiber connection, comprising the following steps: S1. The water tank 1 is used for storing water. The workpiece is placed on the XY moving platform 12 and clamped and fixed by four clamping blocks 14. The XY moving platform 12 can move back and forth, left and right, so as to realize the planar movement of the workpiece. S2. According to the diameter of the required laser spot, the height of the fiber laser head 17 is adjusted by using the electric telescopic column 16, so as to adjust the height of the fiber laser head 17 from the workpiece to be processed, thereby ensuring the accuracy of the spot diameter. S3. According to the requirements of laser shock strengthening for the workpiece, the program of the XY moving platform 12 is programmed, and then the underwater laser shock strengthening operation can be started.

[0029] The working principle of this device is as follows: The workpiece is fixed on the underwater XY moving platform 12 by four clamping blocks 14. The rotation of the first lead screw 6 can drive the first slider 7, the second slide rail 8, the second slider 11 and the XY moving platform 12 to move back and forth as a whole. The rotation of the second lead screw 10 can drive the second slider 11 and the XY moving platform 12 to move left and right as a whole, so as to realize the planar movement of the workpiece. The fiber laser head 17 can move up and down under the telescopic action of the electric telescopic column 16, which is convenient for adjusting the height of the fiber laser head 17 from the workpiece to be processed according to the diameter of the required laser spot, thereby ensuring the accuracy of the spot diameter. According to the requirements of laser shock strengthening for the workpiece, the program of the XY moving platform 12 is programmed, and then the underwater laser shock strengthening operation can be started. The condenser lens converges the different laser beam energies emitted by the nanosecond pulsed laser 19 into the same laser beam, and the content not described in detail in this specification belongs to the prior art well-known to those skilled in the art.

[0030] Although the present invention has been described in detail with reference to the foregoing embodiments, for those skilled in the art, they can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements for some of the technical features. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. An underwater laser shock peening device with movable optical fiber connection, comprising a water tank (1), characterized in that: A first slide rail (4) is fixed inside the water tank (1). A first slider (7) is slidably connected inside the first slide rail (4). A second slide rail (8) is fixed to the top of the first slider (7). A second slider (11) is slidably connected inside the second slide rail (8). An XY moving platform (12) is fixed to the top of the second slider (11). An electric telescopic rod (13) is fixed to the outside of the XY moving platform (12). A clamping block (14) is fixed to the inner end of the electric telescopic rod (13). A support plate (15) is fixed to an inner wall of the water tank (1). The lower side of the support plate (15) is connected to a fiber laser head (17) through an electric telescopic column (16). A nanosecond pulse laser (19) is fixed to one side of the water tank (1). The nanosecond pulse laser (19) is connected to the fiber laser head (17) through an optical fiber line (20).

2. The underwater laser shock strengthening device with movable optical fiber connection according to claim 1, characterized in that: A control panel (2) is fixed to the front side of the water tank (1), and a water outlet valve (3) is fixed to one side of the water tank (1).

3. The underwater laser shock strengthening device with movable optical fiber connection according to claim 2, characterized in that: The control panel (2) includes an industrial computer and a PLC. The industrial computer is used for scheduling and managing each component or sub-device inside, and the PLC realizes the control and monitoring of various devices and processes through programming.

4. The underwater laser shock strengthening device with movable optical fiber connection according to claim 1, characterized in that: A first motor (5) is fixed to one side of the first slide rail (4), and the output end of the first motor (5) is connected to a first lead screw (6). The first lead screw (6) is threadedly connected to the first slider (7).

5. The underwater laser shock strengthening device with movable optical fiber connection according to claim 1, characterized in that: A second motor (9) is fixed to one side of the second slide rail (8), and the output end of the second motor (9) is connected to a second lead screw (10). The second lead screw (10) is threadedly connected to the second slider (11).

6. The underwater laser shock strengthening device with movable optical fiber connection according to claim 1, characterized in that: Four electric telescopic rods (13) are provided, and the four electric telescopic rods (13) are circumferentially and evenly distributed on the XY moving platform (12).

7. A movable fiber-optic connection underwater laser shock strengthening device according to claim 1, characterized in that: A condenser lens is fixed inside the fiber laser head (17), and a water inlet (18) is provided on one side of the fiber laser head (17).

8. The underwater laser shock strengthening device with movable optical fiber connection according to claim 1, characterized in that: The nanosecond pulse laser (19) is a small-energy laser, with a laser energy lower than 1J and a wavelength of 532nm.

9. A method for underwater laser shock peening with movable optical fiber connection, which is applied to an underwater laser shock peening device with movable optical fiber connection according to any one of claims 1-8, characterized in that, It includes the following steps: S1. The water tank (1) is used for storing water. Place the workpiece on the XY moving platform (12) and use the four clamping blocks (14) to clamp and fix the workpiece. The XY moving platform (12) can move back and forth, left and right, so as to realize the planar movement of the workpiece. S2. According to the diameter size of the required laser spot, use the electric telescopic column (16) to adjust the height of the fiber laser head (17), so as to adjust the height of the fiber laser head (17) from the workpiece to be processed, thereby ensuring the accuracy of the spot diameter. S3. According to the requirements of laser shock peening required by the workpiece, program the XY moving platform (12), and then the underwater laser shock peening operation can be started.

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