A method and device for surface strengthening of a turbine disc mortise by multi-angle laser impact

Abstract

The application discloses a kind of multi-angle laser impact turbine disc mortise surface strengthening method and device;The device includes base, translation driving mechanism, laser generating device, refractive optical path adjusting mechanism, workbench transverse moving mechanism and clamping mechanism.Refraction type optical path adjusting mechanism includes mounting bracket, three-prism, half-cylinder lens and prism driving mechanism.Laser generating device is fixed with mounting bracket.The three-prism and half-cylinder lens are installed on the mounting bracket, and the prism driving mechanism is used to drive the three-prism to rotate and move.The application changes the emission direction of laser by rotating the three-prism while keeping the laser vertical, so that the laser can be inclined to irradiate on the sidewall of turbine disc mortise for laser impact strengthening, solving the problem of beam accessibility.The application moves the three-prism to the area outside the laser light path, so that the laser can vertically irradiate on the groove bottom.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of material surface strengthening treatment, in particular to a multi-angle laser impact turbine disc mortise surface strengthening method and device. BACKGROUND

[0002] In the field of aerospace, the turbine disc and the blade of the aero-engine are tightly connected through the mortise and tenon. During the operation of the aircraft engine, the turbine disc and the blade inside the engine rotate at high speed. During the operation of the engine, high-frequency vibration and high-intensity stress concentration are generated in the contact area. In addition, during the manufacturing and processing of the mortise and tenon, harmful residual tensile stress is easily formed on the surface and inside of the material, which makes the surface of the strengthened area prone to fatigue micro-cracks, reduces the safety of the use process of the part, and causes safety hazards. In this process, the tooth root, tooth surface, groove bottom and other parts of the mortise area are prone to failure problems such as corrosion and fracture. Therefore, how to take laser impact strengthening on the turbine disc mortise part to enhance its service life has become an important problem in the manufacturing process of the aero-engine.

[0003] Laser shock peening (LSP) is a material strengthening technology that uses high-power density and short-pulse laser to act on the energy layer of the material surface to generate plasma shock wave, so as to produce residual stress field and gradient structure on the material surface. The plastic deformation layer and residual stress field generated by laser shock peening can effectively improve the mechanical properties of the material. This technology is widely used in the field of material surface strengthening.

[0004] However, due to the extreme working environment of the workpiece, laser shock peening technology is greatly challenged because it only uses single mechanical field. The new development of LSP technology is expected to bring new breakthroughs to the future commercial application of manufacturing large-size or special-shaped metal parts. Multi-field energy assisted laser shock peening technology is a new key development direction of laser shock peening technology, which can synchronously or asynchronously introduce new energy fields such as temperature, electricity and magnetism.

[0005] LSP technology is an ideal means for turbine disc mortise surface strengthening, but the shape of the turbine disc mortise is relatively complex, and the linearly propagating laser is difficult to directly irradiate different positions of the turbine disc mortise. At the same time, the laser is not suitable for direct overall rotation because it needs to maintain the stability of the wavelength, frequency and energy of the laser beam. In addition, the power of the laser is too large, and the reckless rotation will cause unnecessary harm. This further increases the difficulty of using LSP technology to strengthen the concave position of the turbine disc mortise side wall. SUMMARY

[0006] The present application aims at the problems or defects in the prior art, and provides a turbine disc mortise surface strengthening method and device with multi-angle laser impact.

[0007] In a first aspect, the present application provides a turbine disc mortise surface strengthening method with multi-angle laser impact, which comprises the following steps:

[0008] Step one: clamp the turbine disc, and arrange the laser generating device, semi-cylindrical lens and triangular prism in sequence on the end mounting block driven to translate by the power element. The triangular prism can move and rotate around its own axis.

[0009] Step two: one of the mortises of the turbine disc is taken as the processed mortise. The laser generating device outputs laser; the laser passes through the semi-cylindrical lens and the triangular prism in sequence; the semi-cylindrical lens focuses the laser; and the triangular prism refracts the laser to change the laser exit direction.

[0010] Step three: the two side walls of the whole turbine disc mortise are respectively called the first side wall and the second side wall. All the first side walls are located on the same side of the corresponding turbine disc mortise. All the strengthened areas on the side wall of the processed mortise are sequentially subjected to laser strengthening, and the specific process is as follows:

[0011] Step 3-1. The end mounting block drives the laser generating device, semi-cylindrical lens and triangular prism to move integrally, the triangular prism rotates, the laser exit direction is adjusted, the laser is sequentially irradiated on one of the strengthened areas on the first side wall of the processed mortise, and the first side wall of each turbine disc mortise is taken as the target side wall.

[0012] Step 3-2. The strengthened areas on the target side wall of all the turbine disc mortises are sequentially subjected to strengthening.

[0013] Step 3-2-1. The turbine disc moves along the direction of its own axis, so that the laser sweeps through the whole strengthened area, and laser impact strengthening is completed.

[0014] Step 3-2-2. The triangular prism rotates to change the irradiation position of the laser on the target side wall of the processed mortise, so that the laser is irradiated on one of the strengthened areas on the target side wall of the processed mortise which has not been subjected to laser impact strengthening.

[0015] Step 3-2-3. Steps 3-2-1 and 3-2-2 are repeatedly executed until all the strengthened areas on the target side wall of the processed mortise are subjected to laser impact strengthening.

[0016] Step 3-2-4. The turbine disc rotates, so that the next mortise rotates to the processed position and is taken as the new processed mortise.

[0017] Step 3-2-5. Repeat steps 3-2-1 to 3-2-4 until all target sidewalls of the mortise of the turbine disk are completed with impact strengthening.

[0018] Step 3-3. The end mounting block drives the laser generating device, the semi-cylindrical lens and the triangular prism to move as a whole, and the triangular prism rotates to adjust the laser emission direction, so that the laser is sequentially irradiated on one of the strengthened regions of the second sidewall of the processed mortise; taking the second sidewall of each mortise of the turbine disk as the target sidewall, step 3-2 is executed again.

[0019] Step four, sequentially strengthen the strengthened regions of the mortise bottom of all turbine disk mortises.

[0020] Step 4-1. The end mounting block moves so that the laser generating device is aligned with the processed mortise; the triangular prism moves and is misaligned with the laser, so that the laser focused by the semi-cylindrical lens is directly irradiated on the strengthened region of the mortise bottom of the processed mortise without passing through the triangular prism;

[0021] Step 4-2. The turbine disk moves along its own axial direction so that the laser sweeps through the entire strengthened region of the mortise bottom of the turbine disk, completing the laser impact strengthening;

[0022] Step 4-3. The turbine disk rotates so that the next mortise rotates to the processed position as a new processed mortise;

[0023] Step 4-4. Repeat steps 4-2 and 4-3 until the strengthened regions of the mortise bottom of all turbine disk mortises are completed with laser impact strengthening.

[0024] As a preferred, in step one, black adhesive tape is pasted on the surface of each strengthened region of each mortise of the turbine disk.

[0025] As a preferred, in steps three and four, a magnetic field is applied to the turbine disk so that the turbine disk is magnetized.

[0026] As a preferred, in steps three and four, water is continuously sprayed on the processed mortise so that a water flow constraint layer with a thickness of 2mm to 3mm is formed on the surface of the processed mortise, avoiding the heat generated by the laser impact from spreading to the non-strengthened region.

[0027] In the second aspect, the application provides a turbine disk mortise surface strengthening device with multi-angle laser impact, which comprises a base, a translation driving mechanism, a laser generating device, a refractive light path adjusting mechanism, a workbench transverse moving mechanism and a clamping mechanism. The clamping mechanism is installed on the base through the workbench transverse moving mechanism. The clamping mechanism is used for clamping the turbine disk whose mortise needs to be strengthened; the workbench transverse moving mechanism is used for driving the clamping mechanism to move along the axial direction of the turbine disk. The translation driving mechanism is installed on the base; the translation driving mechanism is used for driving the laser generating device and the refractive light path adjusting mechanism to move horizontally and vertically.

[0028] The refractive light path adjusting mechanism comprises a mounting bracket, a triangular prism, a semi-cylindrical lens and a prism driving mechanism. The laser generating device is fixed to the mounting bracket. The triangular prism and the semi-cylindrical lens are mounted on the mounting bracket. The prism driving mechanism is used to drive the triangular prism to rotate and move.

[0029] The triangular prism can be switched between two working positions. When the triangular prism is in the first working position, the laser output by the laser generating device passes through the semi-cylindrical lens and the triangular prism in sequence. At this time, the rotation of the triangular prism can change the direction of the laser. When the triangular prism is in the second working position, the laser output by the laser generating device passes through the semi-cylindrical lens and does not pass through the triangular prism.

[0030] As a preferred, the translation driving mechanism is mounted on the base, comprising an end mounting block, and three parallel driving units arranged in a triangle. The parallel driving unit comprises a vertical column, a sliding block, a connecting rod and a lifting driving motor. The vertical column is fixed on the base. The sliding block is slidingly connected to the vertical column. One end of the connecting rod is rotatably connected to the sliding block. The other end of the connecting rod is rotatably connected to the edge of the end mounting block. The sliding block is driven by the lifting driving motor to move up and down through a synchronous belt. The laser generating device and the refractive light path adjusting mechanism are both mounted on the end mounting block of the translation driving mechanism.

[0031] As a preferred, the refractive light path adjusting mechanism further comprises a lens rotating mechanism. The lens rotating mechanism is used to drive the semi-cylindrical lens to rotate.

[0032] As a preferred, the workbench transverse moving mechanism comprises a guide rail, a transverse moving motor, a transverse moving screw and a sliding plate. The guide rail is arranged on the base. The transverse moving screw is rotatably connected to the base. The transverse moving motor is fixed to the base, and the output shaft is fixed to one end of the transverse moving screw. The sliding plate is slidingly connected to the guide rail and forms a screw pair with the transverse moving screw through a nut.

[0033] As a preferred, the clamping mechanism is mounted on the workbench transverse moving mechanism. The clamping mechanism comprises a clamping table, a fixed support seat, a movable support seat, a rotating shaft, a fixed electromagnetic chuck, a movable electromagnetic chuck and a rotating driving mechanism. The clamping table is fixed to the sliding plate. The fixed support seat is fixed to the clamping table. The movable support seat is slidingly connected to the clamping table and can be locked at different positions. The fixed support seat and the movable support seat are provided with rotating shaft mounting holes aligned with each other. The two ends of the rotating shaft are rotatably connected to the rotating shaft mounting holes of the fixed support seat and the movable support seat, respectively. The fixed electromagnetic chuck and the movable electromagnetic chuck are both in the shape of a ring. The movable electromagnetic chuck is coaxially fixed to the rotating shaft. The fixed electromagnetic chuck is slidingly connected to the rotating shaft and can be detached from the rotating shaft. The movable support seat can be separated from the rotating shaft through the sliding of the movable support seat. The rotating driving mechanism is mounted on the fixed support seat and can drive the rotating shaft to rotate.

[0034] As preferred, the moving direction of the workbench transverse moving mechanism, the axis of the turbine disc installed on the clamping mechanism and the axis of the triangular prism are parallel to each other.

[0035] As preferred, the turbine disc mortise and tenon surface strengthening device further comprises a water spraying device. The water spraying device is used for spraying water on the turbine disc mortise and tenon.

[0036] The present application has the following advantages:

[0037] 1. The present application changes the laser emission direction by rotating the triangular prism, so that the laser can be obliquely irradiated on the sidewall of the turbine disc mortise and tenon for laser impact strengthening, solving the problem of beam accessibility.

[0038] 2. The present application moves the triangular prism to the area outside the laser light path, so that the laser can be vertically irradiated on the groove bottom, thereby completing the strengthening of all the concave areas on the turbine disc mortise and tenon.

[0039] 3. The present application clamps the turbine disc by using the electromagnetic chuck, and can magnetize the turbine disc after reliable clamping. Under the action of a strong magnetic field, free radical pairs are formed between dislocations and obstacles in a close range, and the electron spin behavior in the free radical pairs will be significantly affected by the magnetic field, thereby affecting atomic movement and recombination, and affecting dislocation behavior, so as to directly and positively affect the plastic deformation ability of the material, so that the turbine disc mortise and tenon obtains greater residual stress, and better changes the surface microstructure and mechanical properties of the turbine disc mortise and tenon. BRIEF DESCRIPTION OF DRAWINGS

[0040] In order to more clearly illustrate the technical solutions of the embodiments of the present application or the prior art, the following will briefly introduce the drawings needed to be used in the embodiment or prior art description. The drawings in the following description are some embodiments of the present application, and for those skilled in the art, other drawings can be obtained without creative labor on the basis of these drawings.

[0041] Figure 1 It is a schematic diagram of the three-dimensional structure of the embodiment of the present application.

[0042] Figure 2 It is a schematic diagram of the cross-sectional structure of the embodiment of the present application.

[0043] Figure 3 It is the first combined structure schematic diagram of the laser generating device and the refractive light path adjusting mechanism in the embodiment of the present application. Figure 1 The local enlarged view of part A.

[0044] Figure 4It is the second combination structure schematic view of the laser generating device and the refractive optical path adjusting mechanism in the embodiment of the present application.

[0045] Figure 5 It is the schematic view of the strengthened area on the turbine disc.

[0046] Figure 6 It is the strengthening process schematic view of the three strengthened areas on the sidewall of the turbine disc.

[0047] Figure 7 It is the strengthening process schematic view of the strengthened area on the groove bottom of the turbine disc.

[0048] The figure mark: 1, base; 2, translation driving mechanism; 2-1, end mounting block; 2-2, stand; 2-3, sliding block; 2-4, connecting rod; 3, laser generating device; 4, refractive optical path adjusting mechanism; 4-1, mounting support; 4-2, triangular prism; 4-3, semi-cylindrical lens; 4-4, lens rotating mechanism; 4-5, prism driving mechanism; 5, workbench transverse moving mechanism; 6-1, clamping table; 6-2, fixed support seat; 6-3, movable support seat; 6-4, rotating shaft; 6-5, fixed electromagnetic chuck; 6-6, movable electromagnetic chuck; 6-7, rotating driving mechanism; 7, water spraying device. DETAILED DESCRIPTION

[0049] In order to make the technical personnel of the present application better understand the technical solutions, the present application is further described in detail below in combination with the drawings and specific embodiments. It can be understood that the specific embodiments and drawings described herein are only used to explain the present application, and not to limit the present application. And, for the convenience of description, only the parts related to the embodiments of the present application are shown in the drawings of the present application, and the parts unrelated to the embodiments of the present application are not marked in the drawings.

[0050] As shown in Figure 1 and 2 A multi-angle laser impact turbine disc mortise surface strengthening device, comprising a base 1, a translation driving mechanism 2, a laser generating device 3, a refractive optical path adjusting mechanism 4, a workbench transverse moving mechanism 5, a clamping mechanism 6 and a computer control system.

[0051] The clamping mechanism 6 is used for clamping the turbine disc whose mortise needs to be strengthened; the laser generating device 3 is used for providing the laser for strengthening the mortise of the turbine disc; the refractive optical path adjusting mechanism 4 is used for changing the emission direction of the laser by the prism refraction, so that the laser can irradiate the different concave positions on the side surface of the turbine disc mortise. The translation driving mechanism 2 is used for driving the laser generating device 3 and the refractive optical path adjusting mechanism 4 to move horizontally and vertically, adjusting the processing position. The workbench transverse moving mechanism 5 is used for driving the clamping mechanism 6 to move along the axial direction of the turbine disc, changing the irradiation position of the laser on the strengthened area.

[0052] The translation driving mechanism 2 is installed on the base 1, including a terminal mounting block 2-1, and three parallel driving units arranged in a regular triangle. The parallel driving unit includes a vertical column 2-2, a sliding block 2-3, a connecting rod 2-4 and a lifting driving motor. The vertical column 2-2 is fixed on the base 1. The sliding block 2-3 is slidingly connected to the vertical column 2-2; one end of the connecting rod 2-4 is rotatably connected to the sliding block 2-3; the other end of the connecting rod 2-4 is rotatably connected to the edge of the terminal mounting block 2-1. The sliding block 2-3 is driven by the lifting driving motor through a synchronous belt to perform lifting movement.

[0053] As shown in Figure 3 and 4 , the laser generating device 3 and the refractive light path adjusting mechanism 4 are both installed on the terminal mounting block 2-1 of the translation driving mechanism 2. The laser generating device 3 adopts a nanosecond laser, with a pulse width of 8-20 ns and a spot diameter of 1.5-3 mm.

[0054] The refractive light path adjusting mechanism 4 includes a mounting bracket 4-1, a triangular prism 4-2, a semi-cylindrical lens 4-3, a lens rotating mechanism 4-4 and a prism driving mechanism 4-5. The mounting bracket 4-1 is fixed on the terminal mounting block 2-1 of the translation driving mechanism 2. The triangular prism 4-2 is installed on the mounting bracket 4-1 through the prism driving mechanism 4-5. The semi-cylindrical lens 4-3 is installed on the mounting bracket 4-1 through the lens rotating mechanism 4-4. The laser generating device 3, the triangular prism 4-2 and the semi-cylindrical lens 4-3 are arranged in sequence from top to bottom. The axis of the semi-cylindrical lens 4-3 is parallel to the axis of the triangular prism 4-2; the axis of the laser generating device 3 is perpendicular to the axis of the triangular prism 4-2.

[0055] The lens rotating mechanism 4-4 is used to drive the semi-cylindrical lens 4-3 to rotate around its horizontal axis, adjusting the focusing effect on the laser; the prism driving mechanism 4-5 is used to drive the triangular prism 4-2 to move in the horizontal direction and rotate around its axis; under the driving of the prism driving mechanism 4-5, the triangular prism 4-2 can be moved to the position directly below the semi-cylindrical lens 4-3 to refract the laser and impact the concave area of the side wall of the mortise; or the triangular prism 4-2 can be moved to a position offset from the semi-cylindrical lens 4-3, so that the laser is directly emitted vertically downward to impact the bottom of the mortise.

[0056] The lens rotating mechanism 4-4 which only drives the rotating motion, and the prism driving mechanism 4-5 which simultaneously drives the single-degree-of-freedom rotation and the single-degree-of-freedom movement, both belong to the existing driving structures, which will not be described here.

[0057] The workbench transverse moving mechanism 5 is installed on the base 1 and used to drive the clamping mechanism 6 to move transversely during machining, so as to realize laser impact strengthening at different positions of the tenon groove in the transverse direction. The workbench transverse moving mechanism 5 comprises a guide rail, a transverse moving motor, a transverse moving screw and a sliding plate. The guide rail is arranged on the base 1. The transverse moving screw is rotatably connected to the base 1. The transverse moving motor is fixed to the base 1, and the output shaft is fixed to one end of the transverse moving screw. The sliding plate is slidably connected to the guide rail and forms a screw pair with the transverse moving screw through a nut.

[0058] The clamping mechanism 6 is installed on the sliding plate and used to clamp the turbine disc and magnetize the turbine disc. The clamping mechanism 6 comprises a clamping table 6-1, a fixed support seat 6-2, a movable support seat 6-3, a rotating shaft 6-4, a fixed electromagnetic chuck 6-5, a movable electromagnetic chuck 6-6 and a rotating driving mechanism 6-7. The clamping table 6-1 is fixed to the sliding plate. The fixed support seat 6-2 is fixed to the clamping table 6-1. The movable support seat 6-3 is slidably connected to the clamping table 6-1 and can be locked at different positions.

[0059] The fixed support seat 6-2 and the movable support seat 6-3 are provided with rotating shaft mounting holes aligned with each other. The rotating shaft 6-4 is rotatably connected to the rotating shaft mounting holes of the fixed support seat 6-2 and the movable support seat 6-3 at both ends. The fixed electromagnetic chuck 6-5 and the movable electromagnetic chuck 6-6 are both annular. The movable electromagnetic chuck 6-6 is coaxially fixed to the rotating shaft 6-4. The fixed electromagnetic chuck 6-5 is slidably connected to the rotating shaft 6-4 and can be detached from the rotating shaft 6-4. Through the sliding of the movable support seat 6-3, the movable support seat 6-3 can be separated from the rotating shaft 6-4, so as to facilitate the disassembly and assembly of the workpiece. The rotating driving mechanism 6-7 is installed on the fixed support seat 6-2 and can drive the rotating shaft 6-4 to rotate.

[0060] The sliding direction of the sliding plate in the workbench transverse moving mechanism 5, the axis of the rotating shaft 6-4 and the axis of the triangular prism 4-2 are parallel to each other. The rotation of the triangular prism 4-2 can adjust the direction of the laser emission in a plane perpendicular to the axis of the rotating shaft 6-4, so that the laser can irradiate different positions of the side wall of the tenon groove of the turbine disc.

[0061] During the working process, the turbine disc workpiece is sleeved on the rotating shaft 6-4 and located between the fixed electromagnetic chuck 6-5 and the movable electromagnetic chuck 6-6. When the fixed electromagnetic chuck 6-5 and the movable electromagnetic chuck 6-6 are electrified, the turbine disc is adsorbed and fixed together with the fixed electromagnetic chuck 6-5 and the movable electromagnetic chuck 6-6, so as to realize the clamping and magnetization of the turbine disc.

[0062] In some embodiments, a water spraying device 7 is further included. The water spraying device 7 is used to spray water on the tenon groove being machined, so as to form a 2mm-3mm thick water flow constraint layer on the surface of the tenon groove, avoiding the heat generated by laser impact from spreading to the non-strengthened area.

[0063] The multi-angle laser impact turbine disc mortise surface strengthening device carries out the turbine disc mortise surface strengthening method, including the following steps:

[0064] Step one, paste 3M black tape on the surface of each mortise of the turbine disc; the strengthened area is the concave area of the turbine disc mortise; the turbine disc is sleeved on the rotating shaft 6-4, the dynamic electromagnet is combined with the static electromagnet on the two sides of the turbine disc through the sliding of the dynamic support seat 6-3, and the dynamic electromagnet and the static electromagnet generate a magnetic field and clamp the turbine disc mortise through the computer control system.

[0065] Step two, the rotating drive mechanism 6-7 drives the turbine disc to rotate, so that one of the turbine disc mortises faces directly upwards; the mortise serves as the processed mortise. The laser generating device 3 outputs laser; the laser sequentially passes through the semi-cylindrical lens 4-3 and the triangular prism 4-2; the semi-cylindrical lens 4-3 focuses the laser; the triangular prism 4-2 refracts the laser to change the laser exit direction, so that the laser is obliquely emitted downward.

[0066] Step three, as shown in Figure 5 , there are seven strengthened areas on one turbine disc mortise, which are the bottom of the processed mortise, the one-tooth concave area on the two side walls, the two-tooth strengthened area, and the three-tooth strengthened area. The two side walls of the entire turbine disc mortise are respectively called the first side wall and the second side wall. All the first side walls are located on the same side of the corresponding turbine disc mortise.

[0067] As shown in Figure 6 , all the strengthened areas on the side wall of the processed mortise are sequentially subjected to laser strengthening, and the specific process is as follows:

[0068] 3-1. The translation drive mechanism 2 drives the laser generating device 3 and the refractive optical path adjusting mechanism 4 to move, and the prism drive mechanism 4-5 drives the triangular prism 4-2 to rotate, adjusts the laser exit direction, so that the laser sequentially irradiates on one of the strengthened areas on the first side wall of the processed mortise. Take the first side wall of each turbine disc mortise as the target side wall, and complete the strengthening of the strengthened areas on the first side wall of all the turbine disc mortises through step 3-2.

[0069] 3-2. Strengthen the strengthened areas on the target side wall of all the turbine disc mortises in sequence.

[0070] 3-2-1. The workbench transverse moving mechanism 5 drives the turbine disc to move along the axis direction, so that the laser scans the entire strengthened area, and completes the laser impact strengthening.

[0071] 3-2-2. Rotate the three-prism 4-2 by the prism driving mechanism 4-5, change the irradiation position of the laser on the target side wall of the being-processed mortise, so that the laser irradiates on a non-strengthened region of the target side wall of the being-processed mortise.

[0072] 3-2-3. Repeat the steps 3-2-1 and 3-2-2 until all the strengthened regions of the target side wall of the being-processed mortise are completed.

[0073] 3-2-4. Rotate the turbine disc by the rotation driving mechanism 6-7 by an angle corresponding to one tooth, so that the next mortise is rotated to the state that the opening is directed to the directly above, as a new being-processed mortise. Rotate the three-prism 4-2 by the prism driving mechanism 4-5, change the irradiation position of the laser on the target side wall of the new being-processed mortise, so that the laser irradiates on a non-strengthened region of the target side wall of the new being-processed mortise.

[0074] 3-2-5. Repeat the steps 3-2-1 to 3-2-4 until all the target side walls of the mortises of the turbine disc are completed.

[0075] 3-3. Move the laser generating device 3 and the refractive light path adjusting mechanism 4 by the translation driving mechanism 2, rotate the three-prism 4-2 by the prism driving mechanism 4-5, adjust the direction of the laser, so that the laser irradiates on one of the strengthened regions of the second side wall of the being-processed mortise in turn. Take the second side wall of each mortise of the turbine disc as the target side wall, and repeat the step 3-2, complete the strengthening of the strengthened regions of the second side wall of all the mortises of the turbine disc.

[0076] Step four, as shown in the figure, strengthen the strengthened regions of the mortise bottoms of all the mortises of the turbine disc in turn. Figure 7

[0077] 4-1. Move the laser generating device 3 and the refractive light path adjusting mechanism 4 by the translation driving mechanism 2, so that the laser generating device 3 is directly above the being-processed mortise; move the three-prism 4-2 by the prism driving mechanism 4-5 in the horizontal direction, so that the three-prism 4-2 is staggered with the laser output by the semi-cylindrical lens 4-3, so that the laser focused by the semi-cylindrical lens 4-3 directly irradiates on the strengthened region of the mortise bottom without passing through the three-prism 4-2.

[0078] 4-2. Move the turbine disc along its axis by the workbench transverse moving mechanism 5, so that the laser scans the whole strengthened region of the mortise bottom of the being-processed mortise, and complete the impact strengthening.

[0079] 4-3. Rotate the turbine disc by the rotation driving mechanism 6-7 by an angle corresponding to one tooth, so that the next mortise is rotated to the state that the opening is directed to the directly above, as a new being-processed mortise.​

[0080] 4-4. Repeat steps 4-2 and 4-3 until the strengthening area of the groove bottom on all turbine disk tenon grooves is completed.

[0081] During the entire strengthening process, the translation driving mechanism 2 only needs to move the laser generating device 3 three times, which is performed at steps 3-1, 3-3 and 4-1 respectively, and the laser generating device 3 does not need to move during the rest of the time, thereby reducing the number of movements of the laser generating device 3, reducing the control difficulty, and improving the machining precision.

[0082] It should be understood that the embodiments shown in the figures only show the shape, size and arrangement of the various optional components of the turbine disk tenon groove laser shock peening device according to the present application, which is only illustrative and not limiting, and other shapes, sizes and arrangements can also be adopted without departing from the spirit and scope of the present application.

[0083] It can be understood that the above embodiments are only exemplary embodiments adopted for illustrating the principles of the present application, and the present application is not limited thereto. Various modifications and improvements can be made by those of ordinary skill in the art without departing from the spirit and essence of the present application, and these modifications and improvements are also considered to be within the protection scope of the present application.

Claims

1. A method of multi-angle laser peening of a dovetail surface of a turbine disk, the method comprising: The method comprises the following steps: ​ Step one, clamping the turbine disk, and arranging the laser generating device (3), the semi-cylindrical lens (4-3) and the triangular prism (4-2) in sequence on the end mounting block (2-1) driven to translate by the power element; the triangular prism (4-2) can move and rotate around its own axis; Step two, one of the tenon slots of the turbine disk is taken as the tenon slot to be processed; the laser generating device (3) outputs laser; the laser passes through the semi-cylindrical lens (4-3) and the triangular prism (4-2) in sequence; the semi-cylindrical lens (4-3) focuses the laser; the triangular prism (4-2) refracts the laser to change the laser exit direction; Step three, by rotating the turbine disk and adjusting the laser exit direction of the triangular prism (4-2), all the strengthened areas on the two side walls of the tenon slot to be processed are sequentially subjected to laser strengthening; The specific process of step three is as follows: Step 3-1. The two side walls of the whole turbine disk tenon slot are respectively referred to as the first side wall and the second side wall; all the first side walls are located on the same side of the corresponding turbine disk tenon slot; the end mounting block (2-1) drives the laser generating device (3), the semi-cylindrical lens (4-3) and the triangular prism (4-2) to move integrally, the triangular prism (4-2) rotates to adjust the laser exit direction, so that the laser irradiates on one of the strengthened areas on the first side wall of the tenon slot to be processed in sequence; taking the first side wall of each turbine disk tenon slot as the target side wall; Step 3-2. The strengthened areas on the target side wall of all the turbine disk tenon slots are sequentially subjected to strengthening; Step 3-3. The end mounting block (2-1) drives the laser generating device (3), the semi-cylindrical lens (4-3) and the triangular prism (4-2) to move integrally, the triangular prism (4-2) rotates to adjust the laser exit direction, so that the laser irradiates on one of the strengthened areas on the second side wall of the tenon slot to be processed in sequence; taking the second side wall of each turbine disk tenon slot as the target side wall, step 3-2 is executed again; Step four, by rotating the turbine disk and adjusting the laser exit direction of the triangular prism (4-2), the strengthened areas on the groove bottom of all the turbine disk tenon slots are sequentially subjected to strengthening; wherein, the specific process of step four is as follows: Step 4-1. The end mounting block (2-1) moves so that the laser generating device (3) is aligned with the tenon slot to be processed; the triangular prism (4-2) moves to be staggered with the laser, so that the laser focused by the semi-cylindrical lens (4-3) directly irradiates on the strengthened area on the groove bottom of the tenon slot to be processed without passing through the triangular prism (4-2); Step 4-2. The turbine disk moves along the direction of its own axis, so that the laser sweeps through the whole strengthened area on the groove bottom of the turbine disk tenon slot, and the laser impact strengthening is completed; Step 4-3. The turbine disk rotates so that the next tenon slot rotates to the processed position as a new tenon slot to be processed; Step 4-4. Steps 4-2 and 4-3 are repeated until the strengthened areas on the groove bottom of all the turbine disk tenon slots are subjected to laser impact strengthening; In steps three and four, a magnetic field is applied to the turbine disk to magnetize the turbine disk.

2. A method of multi-angle laser peening of a dovetail surface of a turbine disk according to claim 1, wherein: Step 3-2 comprises: Step 3-2-1. The turbine disk is moved along its own axis so that the laser sweeps across the entire strengthened area to complete the laser shock peening. Step 3-2-2. The prism (4-2) is rotated to change the irradiation position of the laser on the target side wall of the processed mortise and tenon groove so that the laser irradiates a strengthened area on the target side wall of the processed mortise and tenon groove that has not been subjected to laser shock peening; Step 3-2-3. Repeat steps 3-2-1 and 3-2-2 until all the strengthened areas on the target sidewall of the processed mortise and tenon are laser-shock-peened. Step 3-2-4. The turbine disc rotates, causing the next mortise to rotate to the processed position and become the new mortise to be processed; Step 3-2-5. Repeat steps 3-2-1 to 3-2-4 until the target side walls on all turbine disc grooves are impact strengthened.

3. A method of multi-angle laser peening of a dovetail surface of a turbine disk according to claim 1, wherein: In step 1, black tape is pasted on the surface of each reinforced area of ​​each mortise and tenon of the turbine disk.

4. A method of multi-angle laser peening of a dovetail surface of a turbine disk according to claim 1, wherein: In steps three and four, water is continuously sprayed on the processed mortise and tenon, so that a water constraint layer with a thickness of 2 mm to 3 mm is formed on the surface of the processed mortise and tenon, thereby preventing the heat generated by the laser shock from diffusing to the non-strengthening area.

5. A multi-angle laser impact surface strengthening device for turbine disk tongue and groove, characterized by: It comprises a base (1), a translation drive mechanism (2), a laser generating device (3), a refractive optical path adjustment mechanism (4), a workbench transverse movement mechanism (5) and a clamping mechanism (6); the clamping mechanism (6) is mounted on the base (1) through the workbench transverse movement mechanism (5); the clamping mechanism (6) is used to clamp a turbine disc requiring a reinforced mortise and tenon groove; the workbench transverse movement mechanism (5) is used to drive the clamping mechanism (6) to move axially along the turbine disc; the translation drive mechanism (2) is mounted on the base (1); the translation drive mechanism (2) is used to drive the laser generating device (3) and the refractive optical path adjustment mechanism (4) to move horizontally and vertically; The refractive optical path adjustment mechanism (4) comprises a mounting bracket (4-1), a prism (4-2), a semi-cylindrical lens (4-3) and a prism driving mechanism (4-5); the laser generating device (3) is fixed to the mounting bracket (4-1); the prism (4-2) and the semi-cylindrical lens (4-3) are mounted on the mounting bracket (4-1); the prism driving mechanism (4-5) is used to drive the prism (4-2) to rotate and move; The prism (4-2) can be switched between two working positions; when the prism (4-2) is in the first working position, the laser light output by the laser generating device (3) passes through the semi-cylindrical lens (4-3) and the prism (4-2) in sequence, and at this time, the rotation of the prism (4-2) can change the laser light emission direction; when the prism (4-2) is in the second working position, the laser light output by the laser generating device (3) passes through the semi-cylindrical lens (4-3) and does not pass through the prism (4-2); The refractive optical path adjustment mechanism (4) further comprises a lens rotation mechanism (4-4); the lens rotation mechanism (4-4) is used to drive the semi-cylindrical lens (4-3) to rotate; The clamping mechanism (6) is installed on the workbench transverse moving mechanism (5); the clamping mechanism (6) comprises a fixed electromagnetic suction disc (6-5) and a movable electromagnetic suction disc (6-6).

6. A multi-angle laser shock of a turbine disc tenon and groove surface strengthening device according to claim 5, characterized in that: The translation driving mechanism (2) is installed on the base (1) and comprises a terminal mounting block (2-1) and three parallel driving units arranged in a regular triangle; the parallel driving unit comprises a vertical column (2-2), a sliding block (2-3), a connecting rod (2-4) and a lifting driving motor; the vertical column (2-2) is fixed on the base (1); the sliding block (2-3) is slidingly connected to the vertical column (2-2); one end of the connecting rod (2-4) is rotatably connected to the sliding block (2-3); the other end of the connecting rod (2-4) is rotatably connected to the edge of the terminal mounting block (2-1); the sliding block (2-3) is driven to move up and down by the lifting driving motor through a synchronous belt; the laser generating device (3) and the refractive light path adjusting mechanism (4) are both installed on the terminal mounting block (2-1) of the translation driving mechanism (2).

7. A multi-angle laser shock of a turbine disc tenon and groove surface strengthening device according to claim 5, characterized in that: The clamping mechanism (6) further comprises a clamping table (6-1), a fixed support seat (6-2), a movable support seat (6-3), a rotating shaft (6-4) and a rotating driving mechanism (6-7); the clamping table (6-1) is fixed on the sliding plate; the fixed support seat (6-2) is fixed on the clamping table (6-1); the movable support seat (6-3) is slidingly connected to the clamping table (6-1) and can be locked at different positions; the fixed support seat (6-2) and the movable support seat (6-3) are provided with rotating shaft mounting holes aligned with each other; the rotating shaft (6-4) is rotatably connected to the rotating shaft mounting holes of the fixed support seat (6-2) and the movable support seat (6-3) at both ends; the fixed electromagnetic suction disc (6-5) and the movable electromagnetic suction disc (6-6) are both in the shape of a ring; the movable electromagnetic suction disc (6-6) is coaxially fixed on the rotating shaft (6-4); the fixed electromagnetic suction disc (6-5) is slidingly connected to the rotating shaft (6-4) and can be detached from the rotating shaft (6-4); the movable support seat (6-3) can be separated from the rotating shaft (6-4) through the sliding of the movable support seat (6-3); the rotating driving mechanism (6-7) is installed on the fixed support seat (6-2) and can drive the rotating shaft (6-4) to rotate.

8. A multi-angle laser shock of a turbine disc tenon and groove surface strengthening device according to claim 5, characterized in that: The clamping mechanism (6) is parallel to the moving direction of the workbench transverse moving mechanism (5), the axis of the turbine disc installed on the clamping mechanism (6) and the axis of the triangular prism (4-2).

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