Turbine disc mortise surface strengthening method and device based on multi-angle laser shock

Abstract

The invention discloses a multi-angle laser shock turbine disc mortise surface strengthening method and device. The device comprises a base, a translation driving mechanism, a laser generating device, a refraction type light path adjusting mechanism, a workbench transverse moving mechanism and a clamping mechanism. The refraction type light path adjusting mechanism comprises an installation support, a triangular prism, a semi-cylindrical lens and a prism driving mechanism. And the laser generating device is fixed with the mounting bracket. The triangular prism and the semi-cylindrical lens are mounted on the mounting bracket; and the prism driving mechanism is used for driving the prism to rotate and move. Through rotation of the triangular prism, the emergent direction of laser is changed under the condition that the laser is kept in a vertical posture, so that the laser can be obliquely irradiated on the side wall of the mortise of the turbine disc for laser shock peening, and the problem of light beam accessibility is solved. According to the invention, the prism is moved to the area outside the laser light path, so that the laser can vertically irradiate the groove bottom of the mortise.

Description

Technical Field

[0001] The invention relates to the field of material surface strengthening treatment, and in particular to a turbine disk tenon-groove surface strengthening method and device by multi-angle laser impact. Background Art

[0002] In the field of aerospace, the turbine disk and blades of aircraft engines are tightly connected through mortise and tenon. During the operation of the aircraft engine, the turbine disk and blades inside the engine rotate at high speed. During the operation of the engine, high-frequency vibrations will be generated in the contact area, and high-intensity stress concentration will be generated. In addition, during the manufacturing and processing of the mortise and tenon, harmful residual tensile stresses are easily formed on the surface and inside of the material, which makes the surface of the strengthened area prone to fatigue microcracks, which reduces the safety of the parts during use and causes safety hazards. In this process, especially the tooth root, tooth surface, groove bottom and other parts in the mortise and tenon area are prone to corrosion, fracture and other failure problems. Therefore, how to use laser shock strengthening on the mortise and tenon of the turbine disk to enhance its service life has become an important issue in the manufacturing process of aircraft engines.

[0003] Laser shock peening (LSP) is a material strengthening technology that uses high-power density, short-pulse lasers to generate plasma shock waves on the energy layer of the material surface, which creates a residual stress field and a gradient structure on the material surface. The plastic deformation layer and residual stress field produced 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 technology faces major challenges due to the use of only a single mechanical field. New developments in LSP technology are expected to bring new breakthroughs in manufacturing large-sized or special-shaped metal parts for future commercial applications. Multi-field energy-assisted laser shock technology is a new key development direction of laser shock technology, which can synchronously or asynchronously introduce new energy fields such as temperature, electricity, magnetism, etc.

[0005] LSP technology is an ideal means of strengthening the surface of turbine disk tenon grooves, but the shape of turbine disk tenon grooves is relatively complex, and it is difficult for the straight-line laser to directly irradiate different positions of the turbine disk tenon grooves; at the same time, the laser should not be directly rotated as a whole to maintain the stability of the wavelength, frequency, and energy of the laser beam; and the power of the laser is too large, and rash rotation will cause unnecessary harm. This further increases the difficulty of using LSP technology to strengthen the concave position of the side wall of the turbine disk tenon groove. Summary of the invention

[0006] The purpose of the present invention is to provide a method and device for strengthening the surface of a turbine disk groove by multi-angle laser impact in order to solve the problems or defects existing in the above-mentioned prior art.

[0007] In a first aspect, the present invention provides a method for strengthening the surface of a turbine disk groove by multi-angle laser shock, which comprises the following steps: Step 1: Clamp the turbine disc, and arrange the laser generating device, the semi-cylindrical lens and the prism in sequence on the end mounting block driven by the power element for translation. The prism can move and rotate around its own axis.

[0008] Step 2: One of the tenons of the turbine disc is used as the processed tenon. The laser generator outputs laser light; the laser light passes through the semi-cylindrical lens and the prism in sequence; the semi-cylindrical lens focuses the laser light; the prism refracts the laser light to change the direction of the laser light emission.

[0009] Step 3: The two side walls of the entire turbine disk tenon groove are respectively called the first side wall and the second side wall. All first side walls are located on the same side of the corresponding turbine disk tenon groove. All the strengthened areas on the processed tenon groove side walls are laser strengthened in turn. The specific process is as follows:

[0010] Step 3-1. The end mounting block drives the laser generating device, the semi-cylindrical lens and the prism to move as a whole, and the prism rotates to adjust the laser emission direction so that the laser is sequentially irradiated on one of the reinforced areas of the first side wall of the processed mortise; the first side wall of each turbine disk mortise is used as the target side wall; Step 3-2. Sequentially strengthen the target sidewalls of all turbine disk grooves.

[0011] Step 3-2-1. The turbine disk moves along its own axis so that the laser sweeps across the entire strengthened area to complete the laser shock strengthening; Step 3-2-2. The prism 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 side wall of the processed mortise and tenon have completed laser shock strengthening; Step 3-2-4. The turbine disc rotates so that the next mortise and tenon groove rotates to the processed position and serves as a new mortise and tenon groove 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 have been impact-hardened.

[0012] Step 3-3. The end mounting block drives the laser generating device, the semi-cylindrical lens and the prism to move as a whole, and the prism rotates to adjust the laser emission direction so that the laser is sequentially irradiated on one of the reinforced areas of the second side wall of the processed mortise; the second side wall of each turbine disk mortise is used as the target side wall, and step 3-2 is executed again.

[0013] Step 4: Strengthen the strengthened areas at the bottom of all turbine disc tenons in turn.

[0014] Step 4-1. The end mounting block is moved so that the laser generating device is aligned with the processed mortise and tenon; the prism is moved to be offset from the laser so that the laser focused by the semi-cylindrical lens is directly irradiated on the reinforced area at the bottom of the processed mortise and tenon without passing through the prism; Step 4-2. The turbine disk moves along its own axis so that the laser sweeps across the entire strengthened area of ​​the bottom of the turbine disk tongue and groove to complete the laser shock strengthening; Step 4-3. The turbine disk rotates so that the next mortise rotates to the processed position and serves as a new mortise to be processed; Step 4-4. Repeat steps 4-2 and 4-3 until the laser shock peening is completed on the strengthened areas at the bottom of all turbine disk tenons.

[0015] Preferably, in step one, black tape is adhered to the surface of each reinforced area of ​​each mortise and tenon of the turbine disk.

[0016] Preferably, in steps three and four, a magnetic field is applied to the turbine disk to magnetize the turbine disk.

[0017] Preferably, in steps three and four, water is continuously sprayed on the processed mortise and tenon, so that a water flow constraint layer with a thickness of 2 mm to 3 mm is formed on the surface of the processed mortise and tenon, so as to prevent the heat generated by the laser shock from diffusing to the non-strengthened area.

[0018] In the second aspect, the present invention provides a multi-angle laser impact turbine disk tenon surface strengthening device, which includes a base, a translation drive mechanism, a laser generating device, a refractive optical path adjustment mechanism, a workbench transverse mechanism and a clamping mechanism. The clamping mechanism is installed on the base through the workbench transverse mechanism. The clamping mechanism is used to clamp the turbine disk whose tenon needs to be strengthened; the workbench transverse mechanism is used to drive the clamping mechanism to move axially along the turbine disk. The translation drive mechanism is installed on the base; the translation drive mechanism is used to drive the laser generating device and the refractive optical path adjustment mechanism to move horizontally and vertically.

[0019] The refractive optical path adjustment mechanism comprises a mounting bracket, a prism, a semi-cylindrical lens and a prism driving mechanism. The laser generating device is fixed to the mounting bracket. The prism and the semi-cylindrical lens are mounted on the mounting bracket; the prism driving mechanism is used to drive the prism to rotate and move.

[0020] The prism can be switched between two working positions; when the prism is in the first working position, the laser output by the laser generating device passes through the semi-cylindrical lens and the prism in sequence, and at this time, the rotation of the prism can change the laser emission direction; when the 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 prism.

[0021] Preferably, the translation drive mechanism is mounted on a base, including an end mounting block and three parallel drive units arranged in an equilateral triangle. The parallel drive unit includes a column, a slider, a connecting rod and a lifting drive motor. The vertical column is fixed on the base. The slider is slidably connected to the vertical column; one end of the connecting rod is rotationally connected to the slider; the other end of the connecting rod is rotationally connected to the edge of the end mounting block. The slider is driven by the lifting drive motor through a synchronous belt to perform lifting and lowering movements. The laser generating device and the refractive optical path adjustment mechanism are both mounted on the end mounting block of the translation drive mechanism.

[0022] Preferably, the refractive optical path adjustment mechanism further comprises a lens rotation mechanism; the lens rotation mechanism is used to drive the semi-cylindrical lens to rotate.

[0023] Preferably, the workbench transverse movement mechanism comprises a guide rail, a transverse movement motor, a transverse movement screw and a slide plate. The guide rail is arranged on the base. The transverse movement screw is rotatably connected to the base; the transverse movement motor is fixed to the base, and the output shaft is fixed to one end of the transverse movement screw; the slide plate is slidably connected to the guide rail, and forms a screw pair with the transverse movement screw through a nut.

[0024] Preferably, the clamping mechanism is installed on the workbench transverse mechanism. The clamping mechanism includes a clamping table, a fixed support seat, a dynamic support seat, a rotating shaft, a fixed electromagnetic suction cup, a dynamic electromagnetic suction cup and a rotating drive mechanism. The clamping table is fixed on the slide. The fixed support seat is fixed on the clamping table; the dynamic support seat is slidably connected to the clamping table and can be locked at different positions. The fixed support seat and the dynamic support seat are provided with mutually aligned rotating shaft mounting holes; the two ends of the rotating shaft are respectively rotatably connected to the rotating shaft mounting holes of the fixed support seat and the dynamic support seat; the fixed electromagnetic suction cup and the dynamic electromagnetic suction cup are both annular; the dynamic electromagnetic suction cup is coaxially fixed on the rotating shaft. The fixed electromagnetic suction cup is slidably connected to the rotating shaft and can be removed from the rotating shaft. The dynamic support seat can be separated from the rotating shaft by sliding the dynamic support seat. The rotating drive mechanism is installed on the fixed support seat and can drive the rotating shaft to rotate.

[0025] Preferably, the clamping mechanism is parallel to the moving direction of the worktable transverse movement mechanism, the axis of the turbine disk installed on the clamping mechanism, and the axis of the prism.

[0026] Preferably, the turbine disk tongue and groove surface strengthening device further comprises a water spraying device, which is used to spray water on the turbine disk tongue and groove.

[0027] The beneficial effects of the present invention are: 1. The present invention changes the emission direction of the laser while keeping the laser in a vertical position by rotating the prism, so that the laser can be irradiated obliquely on the side wall of the turbine disk groove for laser shock strengthening, thus solving the problem of beam accessibility.

[0028] 2. The present invention moves the prism to an area outside the laser light path so that the laser can be vertically irradiated on the bottom of the mortise, thereby strengthening all the concave areas on the mortise of the turbine disk.

[0029] 3. The present invention utilizes an electromagnetic suction cup to clamp the turbine disk. While completing reliable clamping, the turbine disk can be magnetized. 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, thereby having a direct positive impact on the plastic deformation capacity of the material, so that the turbine disk tenon and groove obtains a greater residual stress, and better changes the surface microstructure and mechanical properties of the turbine disk tenon and groove. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] In order to more clearly illustrate the technical solutions of the embodiments of the present invention or the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. The drawings described below are some embodiments of the present invention. For ordinary technicians in this field, it is obvious that other drawings can be obtained based on these drawings without paying any creative work.

[0031] Figure 1 It is a schematic diagram of the three-dimensional structure of an embodiment of the present invention.

[0032] Figure 2 It is a schematic diagram of the cross-sectional structure of an embodiment of the present invention.

[0033] Figure 3 Schematic diagram of the first combined structure of the laser generating device and the refractive optical path adjustment mechanism in the embodiment of the present invention ( Figure 1 (a partial enlarged view of part A in the figure).

[0034] Figure 4 This is a second schematic diagram of the combined structure of the laser generating device and the refractive optical path adjustment mechanism in an embodiment of the present invention.

[0035] Figure 5 Schematic diagram of the reinforced area on the turbine disk.

[0036] Figure 6 It is a schematic diagram of the strengthening process of three strengthened areas on the side wall of the turbine disk according to the present invention.

[0037] Figure 7 It is a schematic diagram of the strengthening process of the strengthened area of ​​the turbine disk groove bottom according to the present invention.

[0038] Figure markings: 1. base; 2. translation drive mechanism; 2-1. end mounting block; 2-2. column; 2-3. slider; 2-4. connecting rod; 3. laser generating device; 4. refractive optical path adjustment mechanism; 4-1. mounting bracket; 4-2. prism; 4-3. semi-cylindrical lens; 4-4. lens rotation mechanism; 4-5. prism drive mechanism; 5. workbench transverse movement mechanism; 6-1. clamping table; 6-2. fixed support seat; 6-3. dynamic support seat; 6-4. rotating axis; 6-5. fixed electromagnetic suction cup; 6-6. dynamic electromagnetic suction cup; 6-7. rotation drive mechanism; 7. water spraying device. DETAILED DESCRIPTION

[0039] In order to enable those skilled in the art to better understand the technical solution of the present invention, the present invention is further described in detail below in conjunction with the accompanying drawings and specific embodiments. It is understood that the specific embodiments and drawings described herein are only used to explain the present invention, rather than to limit the present invention. In addition, for ease of description, only the parts related to the embodiments of the present invention are shown in the drawings of the present invention, and the parts not related to the embodiments of the present invention are not marked in the drawings.

[0040] like Figure 1 and 2 As shown, a turbine disk tenon surface strengthening device using multi-angle laser impact includes 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, a clamping mechanism 6 and a computer control system.

[0041] The clamping mechanism 6 is used to clamp the turbine disk whose mortise and tenon need to be strengthened; the laser generating device 3 is used to provide laser for strengthening the mortise and tenon of the turbine disk; the refractive optical path adjustment mechanism 4 is used to change the emission direction of the laser by prism refraction, so that the laser can be irradiated on different concave positions on the side of the mortise and tenon of the turbine disk. 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 to adjust the processing position. The worktable transverse movement mechanism 5 is used to drive the clamping mechanism 6 to move along the axial direction of the turbine disk to change the irradiation position of the laser on the strengthened area.

[0042] The translation drive mechanism 2 is mounted on the base 1, and includes an end mounting block 2-1 and three parallel drive units arranged in an equilateral triangle. The parallel drive unit includes a column 2-2, a slider 2-3, a connecting rod 2-4 and a lifting drive motor. The vertical column 2-2 is fixed on the base 1. The slider 2-3 is slidably connected to the vertical column 2-2; one end of the connecting rod 2-4 is rotatably connected to the slider 2-3; the other end of the connecting rod 2-4 is rotatably connected to the edge of the end mounting block 2-1. The slider 2-3 is driven by the lifting drive motor through a synchronous belt to perform lifting and lowering movements.

[0043] like Figure 3 and 4 As shown, the laser generating device 3 and the refractive optical path adjusting mechanism 4 are both mounted on the end mounting block 2-1 of the translation driving mechanism 2. The laser generating device 3 uses a nanosecond laser with a pulse width of 8-20ns and a spot diameter of 1.5-3mm.

[0044] The refractive optical path adjustment mechanism 4 includes a mounting bracket 4-1, a prism 4-2, a semi-cylindrical lens 4-3, a lens rotation mechanism 4-4 and a prism driving mechanism 4-5. The mounting bracket 4-1 is fixed to the end mounting block 2-1 of the translation driving mechanism 2. The prism 4-2 is mounted on the mounting bracket 4-1 through the prism driving mechanism 4-5. The semi-cylindrical lens 4-3 is mounted on the mounting bracket 4-1 through the lens rotation mechanism 4-4. The laser generating device 3, the 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 prism 4-2; the axis of the laser generating device 3 is perpendicular to the axis of the prism 4-2.

[0045] The lens rotating mechanism 4-4 is used to drive the semi-cylindrical lens 4-3 to rotate around its own horizontal axis to adjust the focusing effect of the laser; the prism driving mechanism 4-5 is used to drive the prism 4-2 to move in the horizontal direction and rotate around its own axis; driven by the prism driving mechanism 4-5, the prism 4-2 can move to the bottom of the semi-cylindrical lens 4-3 to refract the laser and perform laser impact on the concave area of ​​the side wall of the mortise; it can also move to a position offset from the semi-cylindrical lens 4-3, so that the laser is directly emitted vertically downward to perform laser impact on the bottom of the mortise.

[0046] The lens rotating mechanism 4-4 that only drives rotational motion, and the prism driving mechanism 4-5 that simultaneously drives single-degree-of-freedom rotation and single-degree-of-freedom movement are both existing driving structures and will not be described in detail here.

[0047] The worktable transverse movement mechanism 5 is installed on the base 1, and is used to drive the clamping mechanism 6 to move transversely during the processing process, so as to realize laser shock strengthening of different positions of the mortise and tenon in the transverse direction. The worktable transverse movement mechanism 5 includes a guide rail, a transverse movement motor, a transverse movement screw and a slide plate. The guide rail is set on the base 1. The transverse movement screw is rotatably connected to the base 1; the transverse movement motor is fixed on the base 1, and the output shaft is fixed to one end of the transverse movement screw; the slide plate is slidably connected to the guide rail, and forms a spiral pair with the transverse movement screw through a nut.

[0048] The clamping mechanism 6 is installed on the slide plate, and is used to clamp the turbine disc and magnetize the turbine disc. The clamping mechanism 6 includes a clamping platform 6-1, a fixed support seat 6-2, a dynamic support seat 6-3, a rotating shaft 6-4, a fixed electromagnetic suction cup 6-5, a dynamic electromagnetic suction cup 6-6 and a rotating drive mechanism 6-7. The clamping platform 6-1 is fixed on the slide plate. The fixed support seat 6-2 is fixed on the clamping platform 6-1; the dynamic support seat 6-3 is slidably connected to the clamping platform 6-1, and can be locked at different positions.

[0049] The fixed support seat 6-2 and the dynamic support seat 6-3 are provided with shaft mounting holes aligned with each other; the two ends of the rotating shaft 6-4 are rotatably connected to the shaft mounting holes of the fixed support seat 6-2 and the dynamic support seat 6-3 respectively; the fixed electromagnetic suction cup 6-5 and the dynamic electromagnetic suction cup 6-6 are both annular; the dynamic electromagnetic suction cup 6-6 is coaxially fixed on the rotating shaft 6-4. The fixed electromagnetic suction cup 6-5 is slidably connected to the rotating shaft 6-4 and can be removed from the rotating shaft 6-4. By sliding the dynamic support seat 6-3, the dynamic support seat 6-3 can be separated from the rotating shaft 6-4 to facilitate the disassembly and assembly of the workpiece. The rotation drive mechanism 6-7 is installed on the fixed support seat 6-2 and can drive the rotating shaft 6-4 to rotate.

[0050] The sliding direction of the slide plate in the worktable transverse movement mechanism 5, the axis of the rotating shaft 6-4, and the axis of the prism 4-2 are parallel to each other. The rotation of the prism 4-2 can adjust the laser emission direction on 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 turbine disc groove.

[0051] During operation, the turbine disc workpiece is sleeved on the rotating shaft 6-4 and is located between the fixed electromagnetic suction cup 6-5 and the moving electromagnetic suction cup 6-6; when the fixed electromagnetic suction cup 6-5 and the moving electromagnetic suction cup 6-6 are energized, the turbine disc is adsorbed and fixed to the fixed electromagnetic suction cup 6-5 and the moving electromagnetic suction cup 6-6 to achieve clamping and magnetization of the turbine disc.

[0052] In some embodiments, a water spray device 7 is further included. The water spray device 7 is used to spray water on the processed mortise and tenon, so that a 2mm-3mm thick water constraint layer is formed on the surface of the mortise and tenon to prevent the heat generated by the laser shock from diffusing to the non-strengthening area.

[0053] The method for strengthening the surface of a turbine disk tenon groove by the multi-angle laser impact turbine disk tenon groove surface strengthening device comprises the following steps: Step 1, stick 3M black tape on the surface of each reinforced area of ​​each mortise of the turbine disk; the reinforced area is specifically the concave area of ​​the mortise of the turbine disk; put the turbine disk on the rotating shaft 6-4, and fit the moving electromagnet and the fixed electromagnet on the two side surfaces of the turbine disk through the sliding of the moving support seat 6-3, and use the computer control system to make the moving electromagnet and the fixed electromagnet generate a magnetic field and clamp the mortise of the turbine disk.

[0054] Step 2: The rotary drive mechanism 6-7 drives the turbine disk to rotate so that one of the tenons of the turbine disk faces upward; the tenon is used as the processed tenon. The laser generator 3 outputs laser light; the laser light passes through the semi-cylindrical lens 4-3 and the prism 4-2 in sequence; the semi-cylindrical lens 4-3 focuses the laser light; the prism 4-2 refracts the laser light to change the direction of the laser light emission so that the laser light is emitted downward at an angle.

[0055] Step 3: Figure 5 As shown, there are seven reinforced areas on a turbine disk tenon groove, which are the reinforced bottom area of ​​the processed tenon groove, the concave one-tooth reinforced area, the two-tooth reinforced area, and the three-tooth reinforced area on the two side walls. The two side walls of the entire turbine disk tenon groove are 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 disk tenon groove.

[0056] like Figure 6 As shown, all the strengthened areas on the side wall of the processed mortise and tenon are laser strengthened in sequence, and the specific process is as follows: 3-1. The translation drive mechanism 2 drives the laser generator 3 and the refractive optical path adjustment mechanism 4 to move, and the prism drive mechanism 4-5 drives the prism 4-2 to rotate, and adjusts the laser emission direction so that the laser is sequentially irradiated on one of the reinforced areas of the first side wall of the processed groove. The first side wall of each turbine disk groove is used as the target side wall, and the reinforced area of ​​the first side wall of all turbine disk grooves is strengthened through step 3-2.

[0057] 3-2. Strengthen the target side wall areas of all turbine disk grooves in sequence.

[0058] 3-2-1. The worktable transverse movement mechanism 5 drives the turbine disk to move along its own axial direction, so that the laser scans the entire strengthened area to complete the laser shock strengthening.

[0059] 3-2-2. The prism 4-2 is driven to rotate by the prism driving mechanism 4-5 to change the irradiation position of the laser on the target side wall of the processed mortise and tenon, so that the laser irradiates a strengthened area on the side wall of the processed mortise and tenon that has not been laser shock strengthened.

[0060] 3-2-3. Repeat steps 3-2-1 and 3-2-2 until all the strengthened areas on the target side wall of the processed mortise and tenon have completed laser shock strengthening.

[0061] 3-2-4. The rotary drive mechanism 6-7 drives the turbine disc to rotate an angle corresponding to one tooth, so that the next tenon groove rotates to a state where the opening faces upward, and serves as a new tenon groove to be processed. The prism drive mechanism 4-5 drives the prism 4-2 to rotate, and changes the irradiation position of the laser on the side wall of the processed tenon groove, so that the laser irradiates a strengthened area on the target side wall of the new tenon groove that has not been laser shock strengthened.

[0062] 3-2-5. Repeat steps 3-2-1 to 3-2-4 until the target side walls on all turbine disc grooves have been impact-hardened.

[0063] 3-3. The translation drive mechanism 2 drives the laser generator 3 and the refractive optical path adjustment mechanism 4 to move, and the prism drive mechanism 4-5 drives the prism 4-2 to rotate, and adjusts the laser emission direction so that the laser is sequentially irradiated on one of the strengthened areas of the second side wall of the processed groove. The second side wall of each turbine disk groove is used as the target side wall, and step 3-2 is repeated to complete the strengthening of the strengthened area of ​​the second side wall of all turbine disk grooves.

[0064] Step 4: Figure 7 As shown, the reinforced areas of the groove bottoms of all turbine disk grooves are reinforced in sequence.

[0065] 4-1. The translation drive mechanism 2 drives the laser generating device 3 and the refractive optical path adjustment mechanism 4 to move, so that the laser generating device 3 is located directly above the processed mortise and tenon; the prism drive mechanism 4-5 drives the prism 4-2 to move in the horizontal direction, and the laser output by the prism 4-2 and the semi-cylindrical lens 4-3 are staggered, so that the laser focused by the semi-cylindrical lens 4-3 directly irradiates the reinforced area at the bottom of the mortise and tenon without passing through the prism 4-2.

[0066] 4-2. The worktable transverse movement mechanism 5 drives the turbine disk to move along its own axial direction, so that the laser scans the entire strengthened area of ​​the processed mortise and tenon groove bottom to complete the impact strengthening.

[0067] 4-3. The rotary drive mechanism 6-7 drives the turbine disc to rotate an angle corresponding to one tooth, so that the next tenon groove rotates to a state where the opening faces upward, and serves as a new tenon groove to be processed.

[0068] 4-4. Repeat steps 4-2 and 4-3 until the laser shock strengthening of the strengthened areas at the bottom of all turbine disc tenons is completed.

[0069] During the entire strengthening process described above, the translation drive mechanism 2 only needs to drive the laser generating device 3 to move three times, which are executed in steps 3-1, 3-3 and 4-1 respectively. The laser generating device 3 does not need to move at the rest of the time, thereby reducing the number of movements of the laser generating device 3, reducing the control difficulty and improving the processing accuracy.

[0070] It should be understood that the embodiment shown in the figure only shows the shape, size and arrangement of the various optional components of the turbine disk tenon and groove laser shock strengthening device according to the present invention, but it is only for illustration and not limitation. Other shapes, sizes and arrangements may also be adopted without departing from the spirit and scope of the present invention.

[0071] It is to be understood that the above embodiments are merely exemplary embodiments used to illustrate the principles of the present invention, but the present invention is not limited thereto. For those of ordinary skill in the art, various modifications and improvements can be made without departing from the spirit and essence of the present invention, and these modifications and improvements are also considered to be within the scope of protection of the present invention.

Claims

1. A method for strengthening the surface of a turbine disk groove by multi-angle laser impact, characterized in that: The following steps are involved: Step 1: Clamp the turbine disk, and arrange the laser generating device (3), the semi-cylindrical lens (4-3) and the prism (4-2) arranged in sequence on the end mounting block (2-1) driven by the power element for translation; the prism (4-2) can move and rotate around its own axis; Step 2: one of the tenons of the turbine disk is used as the processed tenon; the laser generating device (3) outputs laser light; the laser light passes through the semi-cylindrical lens (4-3) and the prism (4-2) in sequence; the semi-cylindrical lens (4-3) focuses the laser light; the prism (4-2) refracts the laser light to change the laser light emission direction; Step 3: By rotating the turbine disk and adjusting the laser emission direction of the prism (4-2), all the strengthened areas on the two side walls of the processed mortise and tenon groove are laser strengthened in sequence. The specific process is as follows: Step 4: By rotating the turbine disk and adjusting the laser emission direction of the prism (4-2), the bottom reinforced areas of all turbine disk tenons are reinforced in turn.

2. The method for strengthening the surface of a turbine disk groove by multi-angle laser shock according to claim 1, characterized in that: The specific process of step three is as follows: Step 3-1. The two side walls of the entire turbine disk tenon groove 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 groove; the end mounting block (2-1) drives the laser generating device (3), the semi-cylindrical lens (4-3) and the prism (4-2) to move as a whole, and the prism (4-2) rotates to adjust the laser emission direction so that the laser is sequentially irradiated on one of the strengthened areas of the first side wall of the processed tenon groove; the first side wall of each turbine disk tenon groove is used as the target side wall; Step 3-2. sequentially strengthen the target sidewalls of all turbine disk grooves; Step 3-2-1. The turbine disk moves along its own axis so that the laser sweeps across the entire strengthened area to complete the laser shock strengthening; Step 3-2-2. The prism (4-2) rotates 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 side wall of the processed mortise and tenon have completed laser shock strengthening; Step 3-2-4. The turbine disc rotates so that the next mortise and tenon groove rotates to the processed position and serves as a new mortise and tenon groove 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 have been impact-hardened; Step 3-3. The end mounting block (2-1) drives the laser generating device (3), the semi-cylindrical lens (4-3) and the prism (4-2) to move as a whole, and the prism (4-2) rotates to adjust the laser emission direction so that the laser is sequentially irradiated on one of the reinforced areas of the second side wall of the processed groove; the second side wall of each turbine disk groove is used as the target side wall, and step 3-2 is performed again.

3. The method for strengthening the surface of turbine disk groove by multi-angle laser shock according to claim 1, characterized in that: The specific process of step 4 is as follows: step 4-1. The end mounting block (2-1) moves so that the laser generating device (3) is aligned with the processed mortise and tenon groove; the prism (4-2) moves and is offset from the laser so that the laser focused by the semi-cylindrical lens (4-3) directly irradiates the reinforced area at the bottom of the processed mortise and tenon groove without passing through the prism (4-2); Step 4-2. The turbine disk moves along its own axis so that the laser sweeps across the entire strengthened area of ​​the bottom of the turbine disk tongue and groove to complete the laser shock strengthening; Step 4-3. The turbine disk rotates so that the next mortise rotates to the processed position and serves as a new mortise to be processed; Step 4-4. Repeat steps 4-2 and 4-3 until the laser shock peening is completed on the strengthened areas at the bottom of all turbine disk tenons.

4. The method for strengthening the surface of a turbine disk groove by multi-angle laser shock according to claim 1, characterized in that: In step one, black tape is pasted on the surface of each reinforced area of ​​each mortise and tenon of the turbine disk.

5. The method for strengthening the surface of turbine disk groove by multi-angle laser shock according to claim 1, characterized in that: In steps three and four, a magnetic field is applied to the turbine disk to magnetize the turbine disk; water is continuously sprayed on the processed mortise and tenon to form a flowing water constraint layer with a thickness of 2 mm to 3 mm on the surface of the processed mortise and tenon to prevent the heat generated by the laser shock from diffusing to the non-strengthened area.

6. A turbine disk tongue and groove surface strengthening device using multi-angle laser impact, characterized in that: The invention comprises 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) and a clamping mechanism (6); the clamping mechanism (6) is installed on the base (1) through the workbench transverse moving mechanism (5); the clamping mechanism (6) is used to clamp a turbine disk whose mortise and tenon groove needs to be strengthened; the workbench transverse moving mechanism (5) is used to drive the clamping mechanism (6) to move axially along the turbine disk; the translation driving mechanism (2) is installed on the base (1); the translation driving mechanism (2) is used to drive the laser generating device (3) and the refractive optical path adjusting 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 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).

7. The multi-angle laser shock turbine disk tongue and groove surface strengthening device according to claim 6, characterized in that: The translation drive mechanism (2) is mounted on a base (1), and comprises an end mounting block (2-1), and three parallel drive units arranged in an equilateral triangle; the parallel drive unit comprises a column (2-2), a slider (2-3), a connecting rod (2-4), and a lifting drive motor; the vertical column (2-2) is fixed on the base (1); the slider (2-3) is slidably connected to the vertical column (2-2); one end of the connecting rod (2-4) is rotationally connected to the slider (2-3); the other end of the connecting rod (2-4) is rotationally connected to the edge of the end mounting block (2-1); the slider (2-3) is driven by the lifting drive motor through a synchronous belt to perform lifting movement; the laser generating device (3) and the refractive optical path adjustment mechanism (4) are both mounted on the end mounting block (2-1) of the translation drive mechanism (2).

8. The turbine disk tongue and groove surface strengthening device of multi-angle laser shock according to claim 6 is characterized in that: 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.

9. The turbine disk tongue and groove surface strengthening device of multi-angle laser shock according to claim 6, characterized in that: The clamping mechanism (6) is installed on the workbench transverse movement mechanism (5); the clamping mechanism (6) includes a clamping platform (6-1), a fixed support seat (6-2), a dynamic support seat (6-3), a rotating shaft (6-4), a fixed electromagnetic suction cup (6-5), a dynamic electromagnetic suction cup (6-6) and a rotating drive mechanism (6-7); the clamping platform (6-1) is fixed on the slide; the fixed support seat (6-2) is fixed on the clamping platform (6-1); the dynamic support seat (6-3) is slidably connected to the clamping platform (6-1) and can be locked at different positions; the fixed support seat (6-2) and the dynamic support seat (6-3) are provided with mutually aligned rotating shaft mounting holes; the rotating shaft (6-4) is fixed on the slide; the fixed support seat (6-2) and the dynamic support seat (6-3) are fixed on the slide; the dynamic support seat (6-3) is fixed on the clamping platform (6-1) and can be locked at different positions; the fixed support seat (6-2) and the dynamic support seat (6-3) are provided with mutually aligned rotating shaft mounting holes; the rotating shaft (6-4) is fixed on the slide; the dynamic support seat (6-6) is fixed on the slide The two ends of the shaft (6-4) are rotatably connected to the rotating shaft mounting holes of the fixed support seat (6-2) and the dynamic support seat (6-3); the fixed electromagnetic suction cup (6-5) and the dynamic electromagnetic suction cup (6-6) are both in annular shape; the dynamic electromagnetic suction cup (6-6) is coaxially fixed on the rotating shaft (6-4); the fixed electromagnetic suction cup (6-5) is slidably connected to the rotating shaft (6-4) and can be removed from the rotating shaft (6-4); the dynamic support seat (6-3) can be separated from the rotating shaft (6-4) by sliding the dynamic support seat (6-3); the rotation drive mechanism (6-7) is installed on the fixed support seat (6-2) and can drive the rotating shaft (6-4) to rotate.

10. The turbine disk tongue and groove surface strengthening device of multi-angle laser shock according to claim 6, characterized in that: The clamping mechanism (6) moves along the worktable transverse movement mechanism (5), and the axis of the turbine disk mounted on the clamping mechanism (6) and the axis of the prism (4-2) are parallel to each other.

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