Ultrasonic shot peening composite strengthening device and method for compressor blade tenon

Abstract

The application discloses a kind of compressor blade tenon ultrasonic shot peening composite strengthening device and composite strengthening method, the method is first by three-dimensional software to establish blade tenon and ultrasonic shot peening strengthening device, then based on EDEM software to establish blade tenon ultrasonic shot peening discrete element simulation model, analysis is carried out after the first established ultrasonic shot peening strengthening device in the shot peening chamber to blade tenon is carried out shot peening strengthening, the shot peening coverage of each area on tenon surface, according to the analysis result, the shot peening chamber and shot peening parameter are optimized and designed, until simulation data result meets product requirement, then carry out blade tenon ultrasonic shot peening composite strengthening chamber processing and blade tenon surface strengthening treatment;The shot peening chamber in the application includes horizontal shot peening chamber and vertical shot peening chamber, the surface of blade tenon stress contact area is shot peened by horizontal shot peening chamber, then the insufficient area is strengthened again by vertical shot peening chamber, and the shot peening uniformity of blade tenon is improved.

Description

Technical Field

[0001] This application relates to the field of shot peening strengthening technology for metal surfaces, and in particular to an ultrasonic shot peening composite strengthening device and method for compressor blade tenons. Background Technology

[0002] Blades are critical components of aero engines, subjected to significant pressure from the compressor disk tenons during service. Their arc-shaped end faces are highly susceptible to fretting wear failure, making surface strengthening of the blade tenons crucial. Blade tenons are complex, irregularly shaped structures with narrow corner areas and semi-enclosed features. Due to geometric limitations, traditional shot peening and sandblasting surface strengthening processes easily lead to shot buildup, high roughness, and uneven surface strengthening, resulting in uneven stress distribution and excessive deformation in the strengthened area. Therefore, ensuring shot peening uniformity is the main challenge in shot peening strengthening of blade tenons.

[0003] Ultrasonic shot peening involves repeatedly impacting the surface of a tenon with high-speed projectiles, causing plastic deformation of the surface layer. By rationally utilizing the introduced residual compressive stress, the fatigue resistance and corrosion resistance of the tenon surface can be improved. However, the use of ultrasonic shot peening on blade tenons also has certain problems: for blade tenons with complex and irregular structures, it is difficult for the projectiles to directly impact the surface of the tenon's shielded area during the shot peening process, resulting in projectile accumulation and poor shot peening uniformity.

[0004] To address the aforementioned technical problems, Chinese invention patent CN202211386840.7 discloses an ultrasonic shot peening strengthening device for the tenon groove of a compressor disc in an aero-engine. This device includes a worktable; a compressor disc clamping device mounted on the worktable, connected to a compressor disc with a tenon groove, used to adjust the horizontal angle of the compressor disc and control its rotation; a slide module fixed to the worktable, the slide module having a vertically adjustable slider; a bracket mounted on the slider; and a shot peening chamber and an ultrasonic vibration device fixed to the bracket. The shot peening chamber has an opening on its upper side and a through hole on its lower side. The upper opening of the shot peening chamber is adapted to the tenon groove of the compressor disc. The ultrasonic vibration device has a vibration head, part of which extends into the through hole on the lower side of the shot peening chamber. By injecting a predetermined number of projectiles into the shot peening chamber, the vibration head of the ultrasonic vibration device excites the projectiles.

[0005] Although the aforementioned patent documents improve the surface strength of the tenon groove by designing a dedicated shot peening chamber for the compressor wheel disk and using ultrasonic shot peening technology to strengthen the groove, thereby improving the fatigue strength performance of the compressor wheel disk in aero-engines and solving the problem of uneven stress distribution in the strengthened area after traditional shot peening of complex components, the device has a complex structure and high manufacturing cost. Moreover, it is mainly used for shot peening the wheel disk tenon groove and is difficult to apply to other parts of the blade tenon, such as the obstructed parts near the tenon end face of the blade edge plate.

[0006] Therefore, problems such as shot accumulation and poor shot peening uniformity in the current process of shot peening for compressor blade tenons have not been well solved. It is necessary to propose a new solution to improve the performance of compressor blade tenons. Summary of the Invention

[0007] This application provides an ultrasonic shot peening composite strengthening device and method for compressor blade tenons, which solves the problems of shot accumulation and poor shot peening uniformity in the existing compressor blade tenon shot peening process.

[0008] To achieve the above objectives, this application provides the following technical solution:

[0009] In a first aspect, this application provides a method for ultrasonic shot peening composite strengthening of compressor blade tenons, comprising the following steps:

[0010] S1: Use 3D modeling software to create a 3D model of the blade tenon and ultrasonic shot peening device according to their actual dimensions. The ultrasonic shot peening device includes a shot peening chamber, blade clamp, ball bearing and vibrating head.

[0011] S2: Import the 3D model established in step S1 into the EDEM software, establish the shot model and the discrete element simulation model of ultrasonic shot peening strengthening of the blade tenon in the EDEM software, and use the simulation model to perform ultrasonic shot peening simulation of the blade tenon to obtain the simulation results.

[0012] S3: Analyze the shot peening coverage of each area on the surface of the blade tenon after shot peening the tenon with the first established shot peening chamber using the simulation results obtained in step S2. If the coverage is not up to standard, return to step S1 to optimize the shot peening chamber. If it meets the standard, perform shot peening chamber processing and surface strengthening treatment.

[0013] S4: Perform secondary strengthening treatment on the blade tenons that were unevenly shot-peened in step S3.

[0014] The shot peening chamber includes a horizontal shot peening chamber and a vertical shot peening chamber. The vertical shot peening chamber is used to perform surface composite strengthening on the blade tenons that are unevenly shot peened in the horizontal shot peening chamber; or, the horizontal shot peening chamber is used to perform surface composite strengthening on the blade tenons that are unevenly shot peened in the vertical shot peening chamber.

[0015] In the above technical solution, in step S1, a three-dimensional model is created using UG software at a 1:1 scale according to the actual dimensions of the blade tenon part and the ultrasonic shot peening device, and the three-dimensional model is exported in a format that can be opened by EDEM software.

[0016] Furthermore, in step S2, when establishing the projectile model and the discrete element simulation model of ultrasonic shot peening strengthening of the blade tenon, the model material properties, collision model and collision properties are set.

[0017] Furthermore, in the model material properties module of the EDEM software, the performance parameters of the blade tenon, shot peening chamber, vibrating head, and shot are written. The performance parameters include material, Poisson's ratio, shear modulus, density, and gravity.

[0018] Furthermore, the blade tenon, shot peening chamber, and vibrating head are all made of TC17.

[0019] Furthermore, the Poisson's ratio for the blade tenon, shot peening chamber, and vibrating head is 0.33.

[0020] Furthermore, the shear modulus of the blade tenon, shot peening chamber, and vibrating head is all 4.397 × 10⁻⁶. 4 GPa.

[0021] Furthermore, the density of the blade tenon, shot peening chamber, and vibrating head is all 4.5 g / cm³. 3 .

[0022] Furthermore, the projectile is made of ZrO2 with a Poisson's ratio of 0.3 and a shear modulus of 8.4 × 10⁻⁶. 4 GPa, density 6.0 g / cm³ 3 .

[0023] Furthermore, the weight of the blade tenon, shot peening chamber, vibrating head, and shot is all 9.8 m / s². 2 .

[0024] Furthermore, in the EDEM software, the collision model of the projectile-blade tenon and the collision model of the projectile-projectile are both selected from the default models of the EDEM software.

[0025] Furthermore, the material of the collision model of the projectile-blade tenon is ZrO2-TC17, and the coefficient of restitution of the collision model of the projectile-blade tenon is 0.6; the material of the collision model of the projectile-projectile is ZrO2-ZrO2, and the coefficient of restitution of the collision model of the projectile-projectile is 0.8.

[0026] Furthermore, in step S2, when performing ultrasonic shot peening simulation of the blade tenon using the simulation model, the discrete element simulation parameters for ultrasonic shot peening strengthening of the blade tenon are set as follows: the shot material is zirconium oxide, the shot diameter is 2.5 mm, the number of shot is 300, the amplitude of the vibrating head is 0.06 mm, and the frequency is 20 kHz.

[0027] Furthermore, in step S3, the simulation results obtained in step S2 are used to analyze the collision situation in each region of the shot-blade tenon surface, observe and statistically analyze the distribution of the shot-blade tenon collision points, and calculate the shot peening coverage distribution in each region of the tenon surface; if the coverage is not up to standard, return to step S1 and optimize the shot peening chamber structure through simulation results.

[0028] Furthermore, the transverse shot peening chamber is a cylindrical chamber with mounting holes on its side wall. Ball bearings are installed within these holes, and blade clamps are installed within the ball bearings to hold the blade tenon parts to be shot peened. A vibrating head is installed on one of the bottom walls of the transverse shot peening chamber, with the installed blade tenon parts and the vibrating head positioned at a relative interval. The central axes of the blade tenon parts, the blade clamps, and the ball bearings are collinear. During shot peening, the blade tenon parts are driven to rotate uniformly along their own axis. When the working surface of the tenon faces the vibrating head, the tenon pauses rotation for a preset time. The ultrasonic shot peening discrete element simulation duration for the blade tenon is set to 20 seconds. The internal dimensions of the transverse shot peening chamber are φ51mm × 100mm.

[0029] Furthermore, the vertical shot peening chamber is a cylindrical chamber. An installation hole is opened on one bottom wall of the vertical shot peening chamber, and a ball bearing is installed in the installation hole. The blade clamp is installed in the ball bearing and holds the blade tenon part to be shot peened. A vibrating head is installed on the other bottom wall of the vertical shot peening chamber. The installed blade tenon part and the vibrating head are arranged at intervals relative to each other. The central axis of the blade tenon part, the blade clamp, the ball bearing and the vertical shot peening chamber are collinear.

[0030] Furthermore, when performing surface composite strengthening on the blade tenon that is unevenly shot-peened in the horizontal shot-peening chamber through the vertical shot-peening chamber, the blade clamp drives the fixed blade tenon installed on it to penetrate into the vertical shot-peening chamber, so that the blade tenon is at a position 50mm away from the surface of the vibrating head; the inner cavity size of the vertical shot-peening chamber is φ51mm×100mm.

[0031] Furthermore, the blade tenon, shot peening chamber, and vibrating head are all made of titanium alloy, while the projectile is made of zirconia ceramic.

[0032] Secondly, this application provides an ultrasonic shot peening composite strengthening device for compressor blade tenons, including a shot peening chamber, a vibrating head, a ball bearing, and a blade clamp; the shot peening chamber includes a horizontal shot peening chamber and a vertical shot peening chamber, the structure and dimensions of the horizontal shot peening chamber and the structure and dimensions of the vertical shot peening chamber are determined according to the above-mentioned ultrasonic shot peening composite strengthening method for compressor blade tenons.

[0033] Compared with the prior art, this application has at least the following beneficial effects:

[0034] Based on further analysis and research of existing technical problems, this application recognizes that current shot peening strengthening processes for compressor blade tenons suffer from issues such as shot buildup and poor shot peening uniformity. Therefore, this application provides a composite ultrasonic shot peening strengthening device and method for compressor blade tenons. The composite strengthening method first establishes a 1:1 scale model of the blade tenon and the ultrasonic shot peening strengthening device using 3D software. Then, it establishes a discrete element simulation model of the blade tenon using EDEM software to analyze the shot coverage of different areas on the tenon surface after shot peening with the initially established shot peening chamber. Based on the analysis results, the shot peening chamber and shot peening parameters are optimized until the simulation data meets product requirements. Finally, ultrasonic shot peening of the blade tenon is performed. The composite strengthening method provided in this application allows for the accurate fabrication of shot peening chambers that meet production requirements. Furthermore, the shot peening chambers in this application include both horizontal and vertical chambers. The horizontal chambers can uniformly peen the surface of the stress-contact area of ​​the blade tenon, while the vertical chambers provide secondary strengthening for areas where shot peening is insufficient. This ultrasonic shot peening composite strengthening method for compressor blade tenons overcomes problems such as high surface roughness, shot buildup, and poor uniformity during shot peening, improving the surface strength of the tenon and uniformizing the stress distribution on the tenon surface, thereby enhancing the performance of aero-engine blade components. Attached Figure Description

[0035] To more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are merely exemplary, and those skilled in the art can derive other embodiments based on the provided drawings without creative effort.

[0036] The structures, proportions, sizes, etc. illustrated in this specification are only for the purpose of assisting those skilled in the art in understanding and reading the content disclosed herein, and are not intended to limit the conditions under which the present invention can be implemented. Therefore, they have no substantial technical significance. Any modifications to the structure, changes in the proportions, or adjustments to the size, without affecting the effects and objectives that the present invention can produce, should still fall within the scope of the technical content disclosed in the present invention.

[0037] Figure 1 This is a flowchart of an ultrasonic shot peening composite strengthening method for compressor blade tenons provided in this application, as one embodiment.

[0038] Figure 2 This is a software interface diagram for creating a projectile model using EDEM software. The sphere in the diagram is a schematic diagram of the projectile model obtained by the software modeling.

[0039] Figure 3 This is a schematic diagram of the simulation effect of a discrete element simulation model of a blade tenon built using EDEM software in one embodiment. The simulation model shows the effect of ultrasonic shot peening of the blade tenon in a transverse shot peening chamber.

[0040] Figure 4 This is a schematic diagram of the structure of an ultrasonic shot peening composite strengthening device provided in this application in one embodiment. The shot peening chamber in the figure is a horizontally placed shot peening chamber.

[0041] Figure 5 (a) is a schematic diagram of the shot peening effect of a compressor blade tenon obtained by using the ultrasonic shot peening composite strengthening method for compressor blade tenons provided in this application in one embodiment, in the YZ view; (b) is a schematic diagram of the shot peening effect of a compressor blade tenon obtained by using the ultrasonic shot peening composite strengthening method for compressor blade tenons provided in this application in one embodiment, in the XZ view.

[0042] Figure 6 This is a schematic diagram of the blade tenon structure in an ultrasonic shot peening composite strengthening method for compressor blade tenons provided in this application, as one embodiment.

[0043] Figure 7 This is a schematic diagram of the structure of an ultrasonic shot peening composite strengthening device provided in this application in one embodiment. The shot peening chamber in the figure is a vertical shot peening chamber.

[0044] Explanation of reference numerals in the attached drawings: 1. Horizontal shot peening chamber; 2. Blade tenon part; 21. Bottom surface of blade tenon; 22. Surface of the force contact area of ​​blade tenon; 23. End face of blade edge plate near tenon; 24. Working surface of blade tenon; 3. Vibrating head; 4. Ball bearing; 5. Blade clamp; 6. Vertical shot peening chamber. Detailed Implementation

[0045] The inventors, through practical experience in the field, have recognized that in current ultrasonic shot peening processes, the shot is difficult to directly impact the surface of the tenon's shielded area, resulting in poor shot peening uniformity in blade tenons. To address these issues, and considering production costs, the inventors have proposed this application to overcome problems such as shot accumulation and poor shot peening uniformity in the current shot peening process for complex, irregularly shaped aero-engine components. This application provides an ultrasonic shot peening composite strengthening device and method for compressor blade tenons. The composite strengthening method primarily designs an ultrasonic shot peening combined chamber based on the tenon's shape, size, and material properties. It combines discrete element method (DEM) simulation analysis of the shot peening coverage on the tenon surface, optimizes the chamber structure based on the distribution, and after obtaining the optimized ultrasonic shot peening combined chamber that meets the requirements, performs chamber processing. Finally, the ultrasonic shot peening composite strengthening method is used to perform shot peening on the tenon surface, solving the problems of shot accumulation and uneven shot peening, thereby improving the tenon surface strength, uniformly distributing stress in the tenon area, and ultimately improving the performance of aero-engine blade components.

[0046] The present application will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0047] Example 1

[0048] This embodiment provides a method for ultrasonic shot peening composite strengthening of compressor blade tenons. (See also...) Figure 1 The steps of the ultrasonic shot peening composite strengthening method for the tenon of the compressor blade are described in detail below:

[0049] 1. Use UG software to create a 3D model of the blade tenon and ultrasonic shot peening device according to their actual dimensions. The ultrasonic shot peening device includes a shot peening chamber, blade clamp, ball bearing and vibrating head. It is preferred to create the 3D model at a 1:1 scale. Of course, in addition to UG software, other 3D modeling software that can create 3D models can also be used, such as SolidWorks software.

[0050] 2. Export the 3D models of the parts and ultrasonic shot peening device created using UG software as igs format files. The exported files should include solid models of the shot peening chamber, blades, vibrating head, ball bearings and blade fixtures.

[0051] 3. Import the above .igs format file into EDEM software, and create a projectile model in EDEM software (e.g., Figure 2 ), establish a discrete element simulation model for ultrasonic shot peening strengthening of blade tenons, set the model's material properties, collision model and collision properties, and finally establish a model as follows. Figure 3 The discrete element simulation model of the blade tenon is shown.

[0052] 4. Analyze the collision situation in different areas of the projectile-blade tenon surface based on the simulation results, and observe and statistically analyze the distribution of the projectile-blade tenon collision points. (See also...) Figure 5 (a) and (b) are schematic diagrams of the shot peening effect of the compressor blade tenon obtained by using the ultrasonic shot peening composite strengthening method for compressor blade tenons provided in this application in one embodiment.

[0053] 5. Based on the distribution of the shot-blade tenon collision points obtained from observation and statistics, calculate the shot peening coverage distribution of each area on the tenon surface.

[0054] 6. Based on the above steps, the distribution of the shot-blade tenon collision points and the shot peening coverage of each area on the tenon surface are obtained. According to the product requirements, it is determined whether the ultrasonic shot peening chamber of the blade tenon needs structural optimization design, whether the tenon rotation speed a (tenon rotation speed a unit is: revolutions / minute) needs to be optimized, and whether the tenon pause time b (pause time b is the pause rotation time when the working surface of the tenon faces the vibrating head, the unit is minutes) needs to be optimized.

[0055] 7. If the simulation data results do not meet the product requirements, repeat steps 1 to 6 above to optimize the shot peening chamber structure through simulation analysis results. At the same time, the shot peening parameters can be optimized in the EDEM software (the shot peening parameters should at least be the tenon speed a and the tenon pause time b) until the simulation data results meet the product requirements.

[0056] 8. If the simulation data results meet the product requirements, complete the ultrasonic shot peening composite strengthening test of the blade tenon, and determine the control parameters of the surface strengthening treatment test, as well as the processing scheme of the strengthening chamber.

[0057] In step 3 above, the performance parameters such as Poisson's ratio, shear modulus, and density of the blade tenon, shot peening chamber, vibrating head, and projectile are entered into the model material properties module of the EDEM software. In one embodiment, the specific parameters are shown in Table 1 below:

[0058] Table 1 Material Properties

[0059]

[0060] In this embodiment, the blades, shot peening chamber, and vibrating head are all made of titanium alloy, and the shot medium is made of zirconia ceramic material.

[0061] The default model used in the EDEM software is Hertz-Mindlin (no slip), which is accurate and efficient in force calculation. In step 3 above, the collision model for the projectile-blade tenon is assigned Hertz-Mindlin (no slip), and the collision model for projectile-to-projectile is assigned Hertz-Mindlin (no slip). The projectile-to-blade tenon restitution coefficient, projectile-to-projectile restitution coefficient, static friction coefficient, and rolling friction coefficient are set. In one embodiment, the collision properties are shown in Table 2 below:

[0062] Table 2 Collision Attributes

[0063] Material <![CDATA[ZrO2-TC17]]> <![CDATA[ZrO2-ZrO2]]> coefficient of recovery 0.6 0.8

[0064] In step 3 above, the discrete element simulation parameters for ultrasonic shot peening strengthening of the blade tenon are as follows: the shot material is zirconium oxide (ZrO2), the shot diameter is 2.5 mm, the number of shot is 300, the vibration head amplitude is 0.06 mm, and the frequency is 20 kHz.

[0065] After establishing the discrete element simulation model of ultrasonic shot peening for blade tenons, motion simulation was performed. During shot peening, the blade tenon rotates uniformly along its own axis. When the working surface of the tenon (which can be understood as the surface to be shot peened) rotates towards the vibrating head, the rotation is paused for a period of time before shot peening. The duration of the ultrasonic shot peening discrete element simulation for blade tenons was set to 20 seconds. The collision situation between the shot and the blade tenon surface in different regions was analyzed based on the simulation results. To facilitate observation of the distribution of the shot-blade tenon collision points, the contact points were magnified by 2 times. The structural dimensions of the shot peening chamber were optimized based on the simulation analysis results until the simulation analysis results met the requirements. The structural dimensions of the shot peening chamber at this point are the structural dimensions of the target shot peening chamber to be processed.

[0066] Therefore, the ultrasonic shot peening composite strengthening method for compressor blade tenons provided in this application first establishes a 1:1 scale model of the blade tenon and ultrasonic shot peening strengthening device using UG software. Then, it establishes a discrete element simulation model of the blade tenon using ultrasonic shot peening based on EDEM software. The model analyzes the shot peening coverage of different areas on the tenon surface after shot peening strengthening using the initially established shot peening chamber. Based on the analysis results, the shot peening chamber and shot peening parameters are optimized until the simulation data meets product requirements. Finally, the ultrasonic shot peening composite strengthening chamber for the blade tenon is processed, and the surface of the blade tenon is strengthened. The composite strengthening method provided in this application can... To accurately manufacture a shot peening chamber that meets production requirements; in addition, the shot peening chamber in this application includes a horizontal shot peening chamber and a vertical shot peening chamber. The horizontal shot peening chamber can be used to uniformly shot peen the surface of the stress contact area of ​​the blade tenon, and then the vertical shot peening chamber can be used to perform secondary strengthening treatment on the insufficiently shot peened areas. The ultrasonic shot peening composite strengthening method for compressor blade tenons provided by this application overcomes the problems of high blade surface roughness, shot accumulation, and poor shot peening uniformity during the shot peening strengthening process, improves the surface strength of the tenon, and uniformly distributes the stress on the surface of the tenon, thereby achieving the goal of improving the performance of aero-engine blade parts.

[0067] Example 2

[0068] This embodiment provides an ultrasonic shot peening composite strengthening device, which includes a shot peening chamber, a vibrating head, a ball bearing, and a blade clamp. The shot peening chamber includes a horizontal shot peening chamber and a vertical shot peening chamber, and the structure and size of the horizontal shot peening chamber and the vertical shot peening chamber are determined by the ultrasonic shot peening composite strengthening method for compressor blade tenons provided in Embodiment 1.

[0069] In this embodiment, the horizontal shot peening chamber is a cylindrical chamber with mounting holes on its side wall. Ball bearings are installed within these mounting holes, and a blade clamp is installed within the ball bearings to hold the blade tenon part to be shot peened. A vibrating head is installed on one bottom wall of the horizontal shot peening chamber. The installed blade tenon part is spaced apart from the vibrating head. Figure 4 The central axes of the blade tenon, blade fixture, and ball bearing are collinear. During the shot peening process, the blade tenon is driven to rotate at a constant speed along its own axis. When the working surface of the tenon faces the vibrating head, the tenon pauses its rotation for a period of time. The discrete element simulation time for ultrasonic shot peening of the blade tenon is set to 20s.

[0070] In this application, the blade tenon part 2 is fitted into the blade clamp 5, the blade clamp 5 is fitted into the ball bearing 4, and the roller bearing 4 is fitted into the transverse shot peening chamber 1 to avoid shot leakage during ultrasonic shot peening. By placing the axes of the blade tenon part 2, the blade clamp 5, and the ball bearing 4 on the same axis, it can be ensured that the blade tenon part 2 can rotate uniformly along its own axis during shot peening.

[0071] In one embodiment, a discrete element simulation model of ultrasonic shot peening for blade tenons is established according to the parameters provided in Embodiment 1. Motion simulation is performed using this model, and the transverse shot peening chamber structure is optimized based on the simulation analysis results. See also... Figure 5 Figure (a) in the middle corresponds to Figure 4 , 6 Analyzing the shot peening effect on the blade tenon surface, with the blade tenon directly facing the vibrating head, the collision points on the surface 22 of the blade tenon's stress-contact area are evenly and densely distributed, while the collision points on the bottom surface 21 of the blade tenon, the blade edge plate near the tenon end face 23, and the working surface 24 of the blade tenon are relatively sparsely distributed. Therefore, the structure of the transverse shot peening chamber was further optimized to ensure that the collision points on the surface of the blade tenon's stress-contact area are evenly and densely distributed, while the collision points on the bottom surface of the blade tenon and the blade edge plate near the tenon end face are relatively sparsely distributed. Finally, the transverse shot peening chamber was determined to be a cylindrical chamber with an internal cavity size of φ51mm × 100mm.

[0072] In the horizontal shot peening chamber of this application, the collision points on the bottom surface of the blade tenon and the near tenon end face of the blade edge plate are relatively sparsely distributed. Therefore, this application uses a vertical shot peening chamber to perform secondary shot peening strengthening treatment on the bottom surface of the blade tenon and the near tenon end face of the blade edge plate.

[0073] In this embodiment, the vertical shot peening chamber is a cylindrical chamber. An installation hole is opened on one bottom wall of the cylindrical chamber, and a ball bearing is installed in the installation hole. The blade clamp is installed in the ball bearing, and the blade tenon part to be shot peened is clamped by the blade clamp. A vibrating head is installed on the other bottom wall of the vertical shot peening chamber. The installed blade tenon part and the vibrating head are arranged at intervals relative to each other.

[0074] Specifically, the vertical shot peening chamber structure is as follows: Figure 7 As shown, the blade tenon part 2 is fitted into the blade clamp 5, the blade clamp 5 is fitted into the ball bearing 4, and the ball bearing 4 is fitted into the vertical shot peening chamber 6 to prevent shot leakage during ultrasonic shot peening. The central axes of the blade tenon part 2, the blade clamp 5, and the ball bearing 4 are on the same straight line. Furthermore, during the secondary shot peening process, the blade tenon part 2 remains fixed, and the blade clamp 5 moves the blade tenon part 2 deeper into the vertical shot peening chamber 6, positioning the blade tenon part 2 at a distance of 50mm from the surface of the vibrating head 3.

[0075] In one embodiment, a discrete element simulation model of ultrasonic shot peening for strengthening blade tenons is established according to the parameters provided in Embodiment 1. Motion simulation is performed using the discrete element simulation model of ultrasonic shot peening for strengthening blade tenons. The structure of the vertical shot peening chamber is optimized based on the simulation analysis results. Finally, the vertical shot peening chamber is determined to be a cylindrical chamber with an inner cavity size of φ51mm×100mm.

[0076] The blade clamp in this application can be any clamp conventional in the art, as long as it meets the requirements of this application.

[0077] Therefore, the ultrasonic shot peening composite strengthening method for compressor blade tenons provided in this application is a method of continuous simulation and optimization. Based on EDEM software, a discrete element simulation model of ultrasonic shot peening for blade tenons is established. The shot peening coverage of each area on the tenon surface after shot peening strengthening with a horizontal or vertical shot peening chamber is analyzed. Based on the analysis results, the horizontal shot peening chamber and shot peening parameters are optimized, or the vertical shot peening chamber and shot peening parameters are optimized. The horizontal and vertical shot peening chambers are used in combination to perform secondary strengthening treatment on areas with insufficient shot peening. That is, this application adjusts the simulation conditions through simulation results feedback, and finally obtains the structural dimensions of the target product that can meet the design requirements.

[0078] In this application, when statistically analyzing the distribution of collision points between the projectile and the blade tenon and calculating the distribution of shot peening coverage in various areas of the tenon surface, if the analysis of the shot peening effect on the blade tenon surface shows that the blade tenon is directly facing the vibrating head, i.e., the collision points on the surface 22 of the blade tenon under force contact are evenly and densely distributed, while the collision points on the bottom surface 21 of the blade tenon, the blade edge plate near the tenon end face 23, and the working surface 24 of the blade tenon are relatively sparse, then the simulation data results are considered not to meet the product requirements, and the transverse shot peening chamber will be further optimized.

[0079] In summary, the ultrasonic shot peening composite strengthening method for compressor blade tenons provided in this application can design an ultrasonic shot peening strengthening combined chamber based on the structural dimensions and material properties of the blade tenon. Combined with discrete element simulation analysis of the shot peening coverage on the tenon surface, and targeting the shielding structure of the working surface of the blade tenon, ultrasonic shot peening composite strengthening technology is used for shot peening strengthening treatment. The chamber structure and shot peening parameters are optimized, overcoming the problems of high roughness, shot accumulation, and poor shot peening uniformity in the existing shot peening strengthening process of complex irregular structural parts of aero-engines. This improves the surface strength of the tenon, uniformly distributes the stress on the surface of the tenon, and achieves the goal of improving the performance of aero-engine blade parts.

[0080] The technical features of the above embodiments can be combined in any way (as long as there is no contradiction in the combination of these technical features). For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described; these embodiments not explicitly written should also be considered to be within the scope of this specification.

[0081] The present application has been described in a relatively specific and detailed manner above through general descriptions and specific embodiments. It should be understood that, based on the technical concept of the present application, several conventional adjustments or further innovations can be made to these specific embodiments; however, as long as they do not depart from the technical concept of the present application, the technical solutions obtained by these conventional adjustments or further innovations also fall within the protection scope of the claims of the present application.

Claims

1. A method for ultrasonic shot peening composite strengthening of compressor blade tenons, characterized in that, Includes the following steps: S1: Use 3D modeling software to create a 3D model of the blade tenon and ultrasonic shot peening device according to their actual dimensions. The ultrasonic shot peening device includes a shot peening chamber, blade clamp, ball bearing and vibrating head. S2: Import the 3D model established in step S1 into the EDEM software, establish the shot model and the discrete element simulation model of ultrasonic shot peening strengthening of the blade tenon in the EDEM software, and use the simulation model to perform ultrasonic shot peening simulation of the blade tenon to obtain the simulation results. S3: Analyze the shot peening coverage of each area on the surface of the blade tenon after shot peening the tenon with the first established shot peening chamber using the simulation results obtained in step S2. If the coverage is not up to standard, return to step S1 to optimize the shot peening chamber. If it meets the standard, perform shot peening chamber processing and surface strengthening treatment. S4: Perform secondary strengthening treatment on the blade tenons that were unevenly shot-peened in step S3. The shot peening chamber includes a horizontal shot peening chamber and a vertical shot peening chamber. The vertical shot peening chamber is used to perform surface composite strengthening on the blade tenons that are unevenly shot peened in the horizontal shot peening chamber; or, the horizontal shot peening chamber is used to perform surface composite strengthening on the blade tenons that are unevenly shot peened in the vertical shot peening chamber.

2. The ultrasonic shot peening composite strengthening method for compressor blade tenons according to claim 1, characterized in that, In step S1, UG software is used to create a 1:1 three-dimensional model of the blade tenon part and the ultrasonic shot peening device according to their actual dimensions, and the 3D model is exported in a format that can be opened by EDEM software.

3. The ultrasonic shot peening composite strengthening method for compressor blade tenons according to claim 1, characterized in that, In step S2, when establishing the projectile model and the discrete element simulation model of ultrasonic shot peening strengthening of the blade tenon, the model material properties, collision model and collision properties are set.

4. The ultrasonic shot peening composite strengthening method for compressor blade tenons according to claim 3, characterized in that, In the model material properties module of the EDEM software, the performance parameters of the blade tenon, shot peening chamber, vibrating head and shot are written. The performance parameters include material, Poisson's ratio, shear modulus, density and gravity. The blade tenon, shot peening chamber, and vibrating head are all made of TC17. The Poisson's ratio of the blade tenon, shot peening chamber, and vibrating head is 0.

33. The shear modulus of the blade tenon, shot peening chamber, and vibrating head is all 4.397 × 10⁻⁶. 4 GPa; The density of the blade tenon, shot peening chamber, and vibrating head is all 4.5 g / cm³. 3 ; The projectile is made of ZrO2, with a Poisson's ratio of 0.3 and a shear modulus of 8.4 × 10⁻⁶. 4 GPa, density 6.0 g / cm³ 3 ; The weight of the blade tenon, shot peening chamber, vibrating head, and shot is all 9.8 m / s². 2 .

5. The ultrasonic shot peening composite strengthening method for compressor blade tenons according to claim 3, characterized in that, In the EDEM software, the collision model of the projectile-blade tenon and the collision model of the projectile-projectile are both selected from the default models of the EDEM software. The material of the projectile-blade tenon collision model is ZrO2-TC17, and the coefficient of restitution of the projectile-blade tenon collision model is 0.6; the material of the projectile-projectile collision model is ZrO2-ZrO2, and the coefficient of restitution of the projectile-projectile collision model is 0.

8. In step S2, when performing ultrasonic shot peening simulation of the blade tenon using a simulation model, the discrete element simulation parameters for ultrasonic shot peening strengthening of the blade tenon are set as follows: the shot material is zirconium oxide, the shot diameter is 2.5 mm, the number of shot is 300, the amplitude of the vibrating head is 0.06 mm, and the frequency is 20 kHz.

6. The ultrasonic shot peening composite strengthening method for compressor blade tenons according to claim 1, characterized in that, In step S3, the simulation results obtained in step S2 are used to analyze the collision situation of each region on the surface of the shot-blade tenon, observe and statistically analyze the distribution of the collision points of the shot-blade tenon, and calculate the distribution of shot peening coverage in each region on the tenon surface; if the coverage is not up to standard, return to step S1 and optimize the shot peening chamber structure through simulation results.

7. The ultrasonic shot peening composite strengthening method for compressor blade tenons according to claim 1, characterized in that, The horizontal shot peening chamber is a cylindrical chamber with mounting holes on its side wall. Ball bearings are installed within these mounting holes, and blade clamps are installed within the ball bearings to hold the blade tenon parts to be shot peened. A vibrating head is installed on one of the bottom walls of the horizontal shot peening chamber, and the installed blade tenon parts are spaced apart from the vibrating head. The central axes of the blade tenon parts, the blade clamps, and the ball bearings are collinear. During shot peening, the blade tenon parts are driven to rotate uniformly along their own axis. When the working surface of the tenon faces the vibrating head, the tenon pauses rotation for a preset time. The discrete element simulation duration for ultrasonic shot peening of the blade tenon is set to 20 seconds. The internal dimensions of the horizontally placed shot peening chamber are φ51mm×100mm.

8. The ultrasonic shot peening composite strengthening method for compressor blade tenons according to claim 1, characterized in that, The vertical shot peening chamber is a cylindrical chamber. An installation hole is formed on one bottom wall of the chamber, and a ball bearing is installed inside the installation hole. The blade clamp is installed inside the ball bearing and holds the blade tenon part to be shot peened. A vibrating head is installed on the other bottom wall of the vertical shot peening chamber, and the installed blade tenon part is spaced apart from the vibrating head. The central axes of the blade tenon part, the blade clamp, the ball bearing, and the vertical shot peening chamber are collinear. When performing surface composite strengthening on the blade tenon that is unevenly shot-peened in the horizontal shot-peening chamber through the vertical shot-peening chamber, the blade clamp drives the fixed blade tenon installed thereon to penetrate into the vertical shot-peening chamber, so that the blade tenon is at a position 50mm away from the surface of the vibrating head. The internal dimensions of the vertical shot peening chamber are φ51mm×100mm.

9. The ultrasonic shot peening composite strengthening method for compressor blade tenons according to claim 1, characterized in that, The blade tenon, shot peening chamber, and vibrating head are all made of titanium alloy, while the projectile is made of zirconia ceramic.

10. A composite strengthening device for ultrasonic shot peening of compressor blade tenons, characterized in that, It includes a shot peening chamber, a vibrating head, a ball bearing, and a blade clamp; the shot peening chamber includes a horizontal shot peening chamber and a vertical shot peening chamber, and the structure and dimensions of the horizontal shot peening chamber and the vertical shot peening chamber are determined according to the ultrasonic shot peening composite strengthening method for compressor blade tenons as described in claim 1.

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