Device for improving ultrasonic strengthening uniformity of mortise of turbine disc and using method of device

Abstract

The invention belongs to a part surface treatment technology, and relates to a projectile type ultrasonic impact strengthening device for a turbine disc mortise and a use method of the projectile type ultrasonic impact strengthening device. Comprising a turbine disc, a turbine disc tongue-and-groove upper sealing plate, a turbine disc tongue-and-groove outer sealing ring, an ultrasonic tool head amplitude detector, an ultrasonic impact profiling impact head, a turbine disc transverse displacement crawler belt, a turbine disc rotary table, a turbine disc ultrasonic workbench sliding rail, a turbine disc ultrasonic workbench and a turbine disc ultrasonic strengthening workbench. The bullets do Brownian motion in the cavity at a high speed, the surface of the inner wall of the mortise is impacted by the bullets without difference, and therefore the uniform strengthening effect is achieved at all positions of the mortise. According to the method, only a small number of shots are consumed, a positioning tool does not need to be moved, all mortises can be completely strengthened only by rotating the turbine disc along the axis in sequence, the high positioning precision is achieved, and the machining efficiency is remarkably improved.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of part surface treatment, and relates to a bullet type ultrasonic impact strengthening device for a turbine disc mortise and tenon joint and a use method thereof. BACKGROUND

[0002] The turbine disc is in a harsh service environment, bears multiple loads such as centrifugal load of the blade, cyclic load of itself, high-temperature corrosion of the gas and the like, is prone to low-cycle fatigue failure, becomes one of the "life-limiting components" of the aero-engine and attracts great attention. The mortise and tenon joint is one of the main areas where fatigue cracks occur. The reason is that, on the one hand, the R angle of the tenon tooth transition of the mortise and tenon joint has a relatively high structural stress concentration coefficient, under the action of alternating load, the actual stress level borne by the R angle area is much higher than the external load, and even exceeds the material yield strength, so that low-cycle fatigue failure is easily caused; on the other hand, the tenon tooth surface has small tool marks and a small bottom corner radius, has a relatively high stress concentration coefficient and produces a relatively high local surface stress concentration, under the action of alternating load, the tenon tooth surface is prone to induce the initiation of fatigue cracks; and thirdly, the tenon tooth stress surface is in contact with the tenon head of the blade, if the assembly is improper, under the action of alternating load, alternating thermal expansion and cold contraction and the like, micro-motion wear exists between the two, and micro-motion fatigue failure of the tooth surface is easily caused.

[0003] At present, the commonly used strengthening method for the mortise and tenon joint is shot peening, that is, a bullet is driven by compressed gas to impact the surface of the part. However, the gap between the tenon teeth of the mortise and tenon joint is small (less than 10 mm), the tenon tooth stress surface is shielded by the adjacent structure and is difficult to be impacted by the bullet, so that the middle part of the tenon tooth stress surface is difficult to reach the shot peening intensity specified in the drawing, thereby causing uneven shot peening effect of the tenon tooth surface, on the one hand, causing the anti-fatigue effect of shot peening to fail to reach the expectation, and on the other hand, causing the tenon tooth to be deformed out of tolerance and affecting the assembly.

[0004] Meanwhile, CN115094215B adopts a mortise and tenon joint ultrasonic impact strengthening method, the mortise and tenon joint is vertically placed, the vibration head is on the bottom surface, and the two sides are closed by using a tool to form an ultrasonic bullet sealed cavity, and the ultrasonic impact strengthening of the mortise and tenon joint is completed, but according to simulation and actual strengthening, the mortise and tenon joint surface coverage rate is detected, the bullet coverage rate on the tenon tooth stress surface (failure concentration part) is poor due to structural interference, and the coverage rate on the tenon head non-stress surface is good. Therefore, the tenon tooth strengthening uniformity of the mortise and tenon joint is poor, and the fatigue performance improvement is poor. SUMMARY

[0005] The purpose of the application is to provide a device for improving the ultrasonic strengthening uniformity of a turbine disc mortise and tenon joint and a use method thereof, so as to overcome the problem of poor bullet accessibility of the turbine disc mortise and tenon joint and improve the strengthening effect uniformity of the turbine disc mortise and tenon joint.

[0006] The technical scheme of the application is as follows:

[0007] The device for improving the ultrasonic strengthening uniformity of the turbine disc mortise and tenon joint comprises a turbine disc 1, an upper turbine disc mortise sealing plate 2, an outer turbine disc mortise sealing ring 3, an ultrasonic tool head amplitude detector 4, an ultrasonic impact profiling impact head 5, a turbine disc transverse displacement crawler belt 6, a turbine disc turntable 7, a turbine disc ultrasonic workbench slide rail 8, a turbine disc ultrasonic workbench 9 and a turbine disc ultrasonic strengthening workbench 10; wherein the turbine disc 1 is fixedly installed on the turbine disc turntable 7 and rotates with the turbine disc turntable 7; the turbine disc turntable 7 is installed on the turbine disc ultrasonic workbench 9 through bolts and moves with the turbine disc ultrasonic workbench 9; the outer turbine disc mortise sealing ring 3 is fixedly connected on the turbine disc ultrasonic workbench 9 and moves with the turbine disc ultrasonic workbench 9; the upper turbine disc mortise sealing plate 2 is fixedly connected on the outer turbine disc mortise sealing ring 3 through bolts; the ultrasonic impact profiling impact head 5 is connected and clamped on the ultrasonic source lifting platform of the turbine disc ultrasonic strengthening workbench 10 and can move in the up-down direction to realize the ultrasonic impact strengthening of the turbine disc mortise and tenon joint; the turbine disc ultrasonic workbench 9 is connected on the turbine disc ultrasonic workbench slide rail 8 through bearings and can move along the turbine disc ultrasonic workbench slide rail 8; the turbine disc ultrasonic workbench 9 is driven to move along the turbine disc ultrasonic workbench slide rail 8 through the rotation of the turbine disc transverse displacement crawler belt 6; the ultrasonic tool head amplitude detector 4 is installed on the turbine disc ultrasonic strengthening workbench 10 and is used for monitoring the amplitude of the ultrasonic impact profiling impact head 5.

[0008] Further, the inner surface of the outer turbine disc mortise sealing ring 3, the turbine disc mortise, the top surface of the ultrasonic impact profiling impact head 5 and the bottom surface of the upper turbine disc mortise sealing plate 2 form a closed cavity, and the ultrasonic impact strengthening of the side surface of the turbine disc mortise is realized through the vibration of the ultrasonic impact profiling impact head 5.

[0009] Further, the gap between the outer turbine disc mortise sealing ring 3 and the outer side end surface of the turbine disc 1 is 0.3 mm.

[0010] Further, the ultrasonic impact profiling impact head 5 is composed of a profiling amplitude transformer 501 and a transducer 502, the profiling amplitude transformer 501 is installed on the transducer 502, the ultrasonic wave frequency generated by the transducer 502 is 20-25 KHz, and the resonance frequency of the amplitude transformer is 18-21 KHz.

[0011] Further, the top surface of the ultrasonic impact profiling impact head 5 is designed according to the mortise and tenon joint profile, the top surface of the profiling impact head 5 is processed into a conical surface according to the simulation result so that more bullets rebound to the mortise and tenon joint side wall after being loaded, and the bullets are stretched to the lower surface of the turbine disc 1 mortise and tenon joint to realize the ultrasonic impact strengthening.

[0012] Further, the mortise and tenon joint profile of the top surface of the ultrasonic impact profiling impact head 5 is coaxial with the side surface of the turbine disc 1 mortise and tenon joint.

[0013] An ultrasonic impact strengthening method for improving the uniformity of ultrasonic strengthening of turbine disk tenon grooves includes the following steps:

[0014] (1) Install the turbine disk 1 on the turbine disk turntable 7 so that the side of the tenon is vertically upward. Drive the turbine disk lateral displacement track 6 to rotate through the motor, so that the turbine disk ultrasonic working platform 9 moves along the turbine disk ultrasonic working table slide rail 8, so that the tenon of the turbine disk to be strengthened moves to the strengthening position.

[0015] (2) Fit the outer sealing ring 3 of the turbine disk tenon groove into the outside of the turbine disk 1 and install it on the ultrasonic working platform 9 of the turbine disk by bolt connection;

[0016] (3) Operate the ultrasonic source lifting platform of the ultrasonic strengthening worktable 10 of the turbine disk to raise the upper end face of the ultrasonic impact contouring impact head 5 to be horizontal with the lower end face of the tenon groove end of the turbine disk 1.

[0017] (4) The outer sealing ring 3 of the turbine disk tenon groove, the side of the tenon groove of the turbine disk 1, and the top surface of the ultrasonic impact contouring impact head 5 form an ultrasonic projectile-shaped cavity groove, and a projectile is placed in the ultrasonic projectile-shaped cavity groove.

[0018] (5) Fix the sealing plate 2 on the turbine disk tenon groove to the top of the tenon groove to be strengthened by bolts to form a closed shot-shaped cavity groove;

[0019] (6) Turn on the power. The ultrasonic impact contouring impact head 5 moves up and down at high speed under the drive of ultrasonic waves, driving the projectile to impact the turbine disk tenon groove.

[0020] (7) After the reinforcement is completed, turn off the power, remove the sealing plate 2 on the turbine disk tenon groove and the projectile in the projectile cavity groove, lower the ultrasonic impact contour impact head 5, rotate the turbine disk turntable 7 so that the next tenon groove enters the position to be reinforced, repeat steps (3) to (6) to carry out the reinforcement of the next turbine disk tenon groove.

[0021] Furthermore, the projectiles are spherical in shape, numbering 10 to 30, with a diameter of Φ0.6mm, and are made of ceramic or cast steel shot with a hardness of HRC55 to 62.

[0022] Furthermore, the ultrasonic impact strengthening time for each tenon groove is 20–60 seconds.

[0023] The advantages of this invention are:

[0024] (1) Overcoming the shortcomings of interference in the tenon and groove structure and poor reachability of the projectile, the turbine disk is placed in a horizontal position so that the tenon and groove surfaces to be strengthened are all the side walls of the ultrasonic chamber. Through the high-speed Brownian motion of the projectile in the cavity, the inner wall surface of the tenon and groove (including the tenon teeth) is hit by the projectile indiscriminately, thereby achieving a uniform strengthening effect in all parts of the tenon and groove.

[0025] (2) This method consumes only a small number of projectiles (10-80), far less than traditional shot peening, resulting in lower processing costs, less dust, and less noise.

[0026] (3) No need to move the positioning fixture. All tenons can be strengthened by rotating the turbine disk along the axis in sequence. It not only has high positioning accuracy, but also significantly improves processing efficiency.

[0027] (4) According to a comparative test, in one embodiment of the present invention, compared with the traditional shot peening and turbine disk vertical ultrasonic impact, the ultrasonic shot impact coverage of the tenon groove force surface of the present method is higher, and the depth of the force surface reinforcement layer increases from no more than 10 μm to more than 50 μm. Attached Figure Description

[0028] Figure 1 Overall schematic diagram of the device;

[0029] Figure 2 Schematic diagram of an ultrasonic vibrating head;

[0030] Figure 3 Schematic diagram of a vertical closed projectile cavity

[0031] Figure 4 A schematic diagram of a horizontally closed projectile cavity. Detailed Implementation

[0032] The present invention will be further described below with reference to the accompanying drawings:

[0033] A device for improving the uniformity of ultrasonic strengthening of turbine disk tenon grooves includes a turbine disk 1, a turbine disk tenon groove upper sealing plate 2, a turbine disk tenon groove outer sealing ring 3, an ultrasonic tool head amplitude detector 4, an ultrasonic impact contouring impact head 5, a turbine disk lateral displacement track 6, a turbine disk turntable 7, a turbine disk ultrasonic worktable slide rail 8, a turbine disk ultrasonic work platform 9, and a turbine disk ultrasonic strengthening worktable 10. The turbine disk 1 is fixedly mounted on the turbine disk turntable 7 and rotates with the turbine disk turntable 7. The turbine disk turntable 7 is bolted to the turbine disk ultrasonic work platform 9 and moves with the turbine disk ultrasonic work platform 9. The turbine disk tenon groove outer sealing ring 3 is fixedly connected to the turbine disk ultrasonic work platform 9 and moves with the turbine disk. The ultrasonic working platform 9 moves; the sealing plate 2 on the turbine disk tenon groove is bolted to the outer sealing ring 3 of the turbine disk tenon groove; the ultrasonic impact contouring impact head 5 is connected and mounted on the ultrasonic source lifting platform of the turbine disk ultrasonic strengthening worktable 10, and can move up and down to achieve ultrasonic impact strengthening of the turbine disk tenon groove; the turbine disk ultrasonic working platform 9 is connected to the turbine disk ultrasonic worktable slide rail 8 through bearings, and can move along the turbine disk ultrasonic worktable slide rail 8; the turbine disk lateral displacement track 6 rotates to drive the turbine disk ultrasonic working platform 9 to move along the turbine disk ultrasonic worktable slide rail 8; the ultrasonic tool head amplitude detector 4 is installed on the turbine disk ultrasonic strengthening worktable 10 to monitor the amplitude of the ultrasonic impact contouring impact head 5.

[0034] The inner surface of the outer sealing ring 3 of the turbine disk tenon groove, the tenon groove of the turbine disk 1, the top surface of the ultrasonic impact contouring impact head 5, and the bottom surface of the upper sealing plate 2 of the turbine disk tenon groove form a sealed cavity. The ultrasonic impact strengthening of the side of the tenon groove of the turbine disk 1 is achieved by the vibration of the ultrasonic impact contouring impact head 5.

[0035] The gap between the outer sealing ring 3 of the turbine disk tenon groove and the outer end face of the turbine disk 1 is 0.3mm.

[0036] The ultrasonic impact contouring impact head 5 consists of a contouring amplitude transformer 501 and a transducer 502. The contouring amplitude transformer 501 is mounted on the transducer 502. The ultrasonic frequency generated by the transducer 502 is 20-25KHz, and the resonant frequency of the amplitude transformer is 18-21KHz.

[0037] Based on the simulation results of ultrasonic impact strengthening of the mortise and tenon structure of turbine disk 1, this study aims to achieve a more uniform strengthening effect on the sidewalls of the mortise and tenon, overcoming the limitations of traditional vertical ultrasonic shot peening. Figure 3 To address the issue of poor uniformity in the reinforcement of the tenon groove bearing surface, a turbine disk-type recumbent ultrasonic impact reinforcement method was designed. Figure 4 The top surface of the ultrasonic impact contouring impact head 5 is designed to resemble a tenon groove. Based on the simulation results, the top surface of the contouring impact head 5 is processed into a conical surface so that more projectiles rebound to the tenon groove sidewall after being loaded into the machine, and then extended to the lower surface of the turbine disk 1 tenon groove for ultrasonic impact strengthening.

[0038] The contour of the mortise and tenon groove on the top surface of the ultrasonic impact contouring impact head 5 is coaxial with the side of the mortise and tenon groove of the turbine disk 1.

[0039] An ultrasonic impact strengthening method for improving the uniformity of ultrasonic strengthening of turbine disk tenon grooves includes the following steps:

[0040] (1) Install the turbine disk 1 on the turbine disk turntable 7 so that the side of the tenon is vertically upward. Drive the turbine disk lateral displacement track 6 to rotate through the motor, so that the turbine disk ultrasonic working platform 9 moves along the turbine disk ultrasonic working table slide rail 8, so that the tenon of the turbine disk to be strengthened moves to the strengthening position.

[0041] (2) Fit the outer sealing ring 3 of the turbine disk tenon groove into the outside of the turbine disk 1 and install it on the ultrasonic working platform 9 of the turbine disk by bolt connection;

[0042] (3) Operate the ultrasonic source lifting platform of the ultrasonic strengthening worktable 10 of the turbine disk to raise the upper end face of the ultrasonic impact contouring impact head 5 to be horizontal with the lower end face of the tenon groove end of the turbine disk 1.

[0043] (4) The outer sealing ring 3 of the turbine disk tenon groove, the side of the tenon groove of the turbine disk 1, and the top surface of the ultrasonic impact contouring impact head 5 form an ultrasonic projectile-shaped cavity groove, and a projectile is placed in the ultrasonic projectile-shaped cavity groove.

[0044] (5) Fix the sealing plate 2 on the turbine disk tenon groove to the top of the tenon groove to be strengthened by bolts to form a closed shot-shaped cavity groove;

[0045] (6) Turn on the power. The ultrasonic impact contouring impact head 5 moves up and down at high speed under the drive of ultrasonic waves, driving the projectile to impact the turbine disk tenon groove.

[0046] (7) After the reinforcement is completed, turn off the power, remove the sealing plate 2 on the turbine disk tenon groove and the projectile in the projectile cavity groove, lower the ultrasonic impact contour impact head 5, rotate the turbine disk turntable 7 so that the next tenon groove enters the position to be reinforced, repeat steps (3) to (6) to carry out the reinforcement of the next turbine disk tenon groove.

[0047] The projectiles are spherical, numbering 10 to 30, with a diameter of Φ0.6mm, and are made of ceramic or cast steel, with a hardness of HRC55 to 62.

[0048] The ultrasonic impact strengthening time for each tenon groove is 20–60 seconds.

[0049] The working principle of this invention is:

[0050] Ultrasonic waves, with their high frequency, high energy, and high power density, are an ideal power source for high-energy surface strengthening. Therefore, this invention utilizes an ultrasonic source to generate vibrations, which are amplified by an amplitude transformer to excite a hard projectile within a cavity. First, the semi-open tenon groove is completely sealed to form a cavity. Then, a hard projectile is placed within the cavity. Under ultrasonic excitation, the projectile impacts the inner wall of the cavity at high speed, causing elastoplastic deformation of the inner wall surface, thus achieving surface strengthening. Because the projectile undergoes Brownian motion within the cavity, the number of impacts and the force on all parts of the tenon groove inner wall (including the tenon tooth bearing surface) are the same. Therefore, the strengthening effect on the tenon tooth surface is uniform, thereby solving the structural interference problem.

[0051] Example:

[0052] In this embodiment, the turbine disk 1 has 32 tenons. The turbine disk 1 is mounted on the turbine disk turntable 7 with the tenons facing vertically upwards. The upper end of the ultrasonic impact contouring impact head 5 is machined into a groove in the shape of a tenon, and a conical reflective surface with a height of 1.5mm is machined in the middle. The turbine disk lateral displacement track 6 is rotated by a motor, causing the turbine disk ultrasonic working platform 9 to move along the turbine disk ultrasonic working table slide rail 8, so that the tenon of the turbine disk to be strengthened is moved to the strengthening position. Then, the outer sealing ring 3 of the turbine disk tenon is fitted onto the outside of the turbine disk 1 and installed on the turbine disk ultrasonic working platform 9 by bolts. The ultrasonic source lifting platform of the turbine disk ultrasonic strengthening working table 10 is operated to raise the upper end face of the ultrasonic impact contouring impact head 5 to be horizontal with the lower end face of the tenon of the turbine disk 1. The outer sealing ring 3 of the turbine disk tenon, the side of the tenon of the turbine disk 1, and the top surface of the ultrasonic impact contouring impact head 5 form an ultrasonic projectile-shaped cavity, into which 15 projectiles with a diameter of Φ0.6mm are placed. Finally, the sealing plate 2 on the turbine disk tenon groove is fixed above the tenon groove to be reinforced by bolts to form a sealed shot-shaped cavity groove.

[0053] During ultrasonic impact, the transducer 502 generates an ultrasonic frequency of 22kHz, and the amplitude transformer's resonant frequency is 20kHz. After 20 seconds of ultrasonic impact, the sealing plate 2 on the turbine disk tenon groove and the projectile in the projectile-shaped cavity groove are removed. The ultrasonic impact contouring impact head 5 is lowered, and the turbine disk turntable 7 is rotated so that the next tenon groove enters the position to be strengthened. The above operation is repeated to strengthen all 32 tenons grooves. The surface dust is cleaned with compressed gas, and the surface is cleaned with alcohol or acetone before being packed.

Claims

1. A device for improving the uniformity of ultrasonic strengthening of turbine disk tenon grooves, characterized in that: The device comprises a turbine disc (1), a turbine disc mortise upper sealing plate (2), a turbine disc mortise outer sealing ring (3), an ultrasonic tool head amplitude detector (4), an ultrasonic impact profiling impact head (5), a turbine disc transverse displacement crawler belt (6), a turbine disc rotary table (7), a turbine disc ultrasonic workbench slide rail (8), a turbine disc ultrasonic workbench (9), and a turbine disc ultrasonic strengthening workbench (10); wherein the turbine disc (1) is fixedly installed on the turbine disc rotary table (7) and rotates with the turbine disc rotary table (7); the turbine disc rotary table (7) is installed on the turbine disc ultrasonic workbench (9) through bolts and moves with the turbine disc ultrasonic workbench (9); the turbine disc mortise outer sealing ring (3) is fixedly connected on the turbine disc ultrasonic workbench (9) and moves with the turbine disc ultrasonic workbench (9); the turbine disc mortise upper sealing plate (2) is fixedly connected on the turbine disc mortise outer sealing ring (3) through bolts; the ultrasonic impact profiling impact head (5) is connected and clamped on the ultrasonic source lifting platform of the turbine disc ultrasonic strengthening workbench (10) and can move in the up-down direction to realize ultrasonic impact strengthening of the turbine disc mortise; the turbine disc ultrasonic workbench (9) is connected on the turbine disc ultrasonic workbench slide rail (8) through bearings and can move along the turbine disc ultrasonic workbench slide rail (8); the turbine disc ultrasonic workbench (9) is driven to move along the turbine disc ultrasonic workbench slide rail (8) through rotation of the turbine disc transverse displacement crawler belt (6); the ultrasonic tool head amplitude detector (4) is installed on the turbine disc ultrasonic strengthening workbench (10) and is used for monitoring the amplitude of the ultrasonic impact profiling impact head (5).

2. The device for improving the uniformity of ultrasonic strengthening of the tenon slot of a turbine disk according to claim 1, characterized in that: The inner surface of the turbine disc mortise outer sealing ring (3), the turbine disc mortise, the top surface of the ultrasonic impact profiling impact head (5), and the bottom surface of the turbine disc mortise upper sealing plate (2) form a closed cavity, and ultrasonic impact strengthening of the side surface of the turbine disc mortise is realized through vibration of the ultrasonic impact profiling impact head (5).

3. The device for improving the uniformity of ultrasonic strengthening of the tenon slot of a turbine disk according to claim 1, characterized in that: The gap between the turbine disc mortise outer sealing ring (3) and the outer side end surface of the turbine disc (1) is 0.3 mm.

4. The device for improving the uniformity of ultrasonic strengthening of the mortise of a turbine disc according to claim 1, characterized in that: The ultrasonic impact profiling impact head (5) is composed of a profiling amplitude transformer (501) and a transducer (502), the profiling amplitude transformer (501) is installed on the transducer (502), the ultrasonic wave frequency generated by the transducer (502) is 20-25 KHz, and the resonance frequency of the amplitude transformer is 18-21 KHz.

5. The device for improving the uniformity of ultrasonic strengthening of the tenon slot of a turbine disk according to claim 1, characterized in that: The top surface of the ultrasonic impact profiling impact head (5) is designed according to a mortise profile, and the top surface of the ultrasonic impact profiling impact head (5) is machined into a conical surface according to simulation results so that more pellets rebound to the side wall of the mortise after being loaded, and the pellets are stretched to the lower surface of the turbine disc mortise for ultrasonic impact strengthening.

6. The device for improving the uniformity of ultrasonic strengthening of the tenon slot of a turbine disc according to claim 5, characterized in that: The mortise profile of the top surface of the ultrasonic impact profiling impact head (5) is coaxial with the side surface of the turbine disc mortise.

7. An ultrasonic impact strengthening method of the device for improving the uniformity of turbine disc mortise ultrasonic strengthening according to any one of claims 1-6. Step 1 install the turbine disk (1) on the turbine disk turntable (7) with the mortise side vertically upward, rotate the turbine disk transverse displacement crawler belt (6) by the motor drive, move the turbine disk ultrasonic working platform (9) along the turbine disk ultrasonic working platform slide rail (8), so that the turbine disk mortise to be strengthened moves to the strengthening position; Step 2 put the turbine disk mortise outer sealing ring (3) into the turbine disk 1 outside, and install it on the turbine disk ultrasonic working platform (9) by bolt connection; Step 3 operate the ultrasonic source lifting platform of the turbine disk ultrasonic strengthening working platform (10), lift the upper end surface of the ultrasonic impact profiling impact head (5) to be horizontal with the lower end surface of the turbine disk (1) mortise end; Step 4 the turbine disk mortise outer sealing ring (3), the turbine disk (1) mortise side, the top surface of the ultrasonic impact profiling impact head (5) form the ultrasonic projectile cavity groove, put the projectile into the ultrasonic projectile cavity groove; Step 5 fix the turbine disk mortise upper sealing plate (2) on the mortise to be strengthened by bolt, form the closed projectile cavity groove; Step 6 turn on the power, the ultrasonic impact profiling impact head (5) does high speed up and down reciprocating motion under the drive of ultrasonic wave, drive the projectile to hit the turbine disk mortise; Step 7 after the strengthening is completed, turn off the power, take down the turbine disk mortise upper sealing plate (2) and the projectile in the projectile cavity groove, lower the ultrasonic impact profiling impact head (5), rotate the turbine disk turntable (7), so that the next mortise enters the position to be strengthened, repeat steps 3 to 6, strengthen the next turbine disk mortise.

8. The ultrasonic impact strengthening method of claim 7, wherein, The projectile is spherical, the number is 10-30, the diameter is Φ0.6mm, the material is ceramic ball or cast steel ball, and the hardness is HRC55-62.

9. The ultrasonic impact strengthening method of claim 7, wherein, The ultrasonic impact strengthening time of each mortise is 20-60s.

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