A method and system for partitioned solid-liquid coupling strengthening of engine blades

Abstract

The application belongs to the technical field of surface strengthening, and particularly relates to an engine blade partition solid-liquid coupling strengthening method and system. The strengthening method comprises the following steps: a spray gun support is designed according to the maximum outer shape size of the blade; the blade surface is divided into different partitions according to the characteristics of the blade, and a corresponding shot strength is designed for each partition; the strengthening process parameters of different partitions are formulated according to the shot strength, and the contour arrangement of the spray gun mechanism is carried out according to the blade contour; before the strengthening, the blade surface is cleaned by using a liquid phase medium; after the cleaning, a shot program is prepared according to the determined strengthening process parameters, the coupling concentration of the solid and liquid phase media is adjusted, and the shot program is run to execute the surface strengthening; after the surface strengthening treatment is completed, the blade surface is cleaned again by using the liquid phase medium. The method greatly improves the precision and manufacturing efficiency of the blade surface processing, effectively reduces the blade deformation caused by the overall treatment, and significantly improves the performance and service life of the blade.

Description

Technical Field

[0001] This invention belongs to the field of surface strengthening technology, specifically relating to a method and system for strengthening engine blades through partitioned solid-liquid coupling. Background Technology

[0002] As early as the 1920s and 30s, after shot peening was discovered to improve the fatigue performance of parts, the shot peening strengthening process, which evolved from shot peening (blasting) cleaning, was immediately used to improve the fatigue strength of automotive parts (especially springs) and was first widely applied in the automotive manufacturing industry. Given its low cost, high production efficiency, and especially its remarkable strengthening effect, this process was quickly applied to the aerospace manufacturing industry, where it has achieved significant development and continuous improvement in both aerospace and military manufacturing.

[0003] With the rapid development of aviation technology, the new technologies adopted in aero engines are also constantly increasing, and some complex thin-walled hollow components have become important parts for improving the performance of the new generation of aero engines. Engine blades not only have complex curved shapes, but some products also have complex internal structures, such as variable thickness designs and reinforcing ribs. Due to the uneven distribution of blade structural elements and the different residual stresses generated in different areas during manufacturing, there are currently two main methods for full-surface shot peening of blades, based on domestic and international literature and patents. One method is full-surface shot peening with equal intensity, and the other is a step-by-step strengthening method using different shot peening intensities in different areas (i.e., strengthening one area before moving to the next, until all areas are strengthened). For the former, using the same shot peening intensity in all areas of the blade inevitably leads to structural deformation due to the different amounts of surface deformation caused by shot peening in each area. This is especially true in thinner hollow and edge areas, which can easily cause the structural components to exceed dimensional tolerances and become unusable when connected to other structures, resulting in component scrap. It is also not conducive to performance optimization and control for hollow structures. The latter method improves the control of blade deformation and performance, but shot peening a certain area will affect the overall shape and stress distribution in other areas. Step-by-step strengthening of each area also requires separate shielding protection and adjustments to equipment parameters and process paths, thus raising issues of control accuracy and efficiency. Summary of the Invention

[0004] (a) Technical problems to be solved

[0005] This invention addresses the problems of imprecise blade deformation control and low efficiency and poor control precision in existing full-surface equal-strength shot peening processes. It proposes a method and system for zoned solid-liquid coupling strengthening of engine blades. The aim is to improve the efficiency and precision of shot peening of engine blades, while optimizing blade surface quality and reducing the risk of component deformation and damage caused by uneven material removal or stress concentration.

[0006] (II) Technical Solution

[0007] To achieve the above objectives, the first aspect of the present invention provides a method for strengthening engine blades through partitioned solid-liquid coupling, the strengthening method comprising:

[0008] The spray gun bracket is designed according to the maximum external dimensions of the blades to be reinforced.

[0009] Based on the internal and external structural characteristics of the blades and the requirements of the service environment, the blade surface is divided into different zones, and a corresponding shot peening intensity is designed for each zone.

[0010] Based on the shot peening intensity designed for each zone, the strengthening process parameters for different zones are formulated, and the spray gun mechanism is arranged in accordance with the shape of the blade surface.

[0011] Before intensification, the blade surface is cleaned with a liquid medium;

[0012] After cleaning, a shot peening control program is developed based on the determined strengthening process parameters. The coupling concentration of the solid and liquid media is adjusted and the shot peening control program is run. The spray gun mechanism of each zone is activated to perform surface strengthening.

[0013] After the surface strengthening treatment is completed, the blade surface is cleaned again using a liquid medium.

[0014] Furthermore, the liquid phase medium is selected from water or oil, and the solid phase medium is selected from glass, ceramics or steel shot.

[0015] Furthermore, the strengthening process parameters include shot peening strengthening gas pressure, shot peening distance, shot peening time, and coupling concentration of the shot peening medium.

[0016] Furthermore, the shot peening incident angle of the spray gun mechanism is 90°.

[0017] Furthermore, all spray guns in the spray gun mechanism are equipped with spray gun baffles. When cleaning the blade surface with liquid medium, the coupling concentration value of solid medium and liquid medium is set to 0% or the inlet of solid medium is closed and the spray gun baffle is opened.

[0018] To achieve the above objectives, a second aspect of the present invention provides a partitioned solid-liquid coupling strengthening system for engine blades, used to perform the strengthening method, the strengthening system comprising:

[0019] The spray gun holder is equipped with multiple mounting holes;

[0020] A position adjustment mechanism is provided on each of the mounting holes;

[0021] The spray gun mechanism is provided on each of the position adjustment mechanisms;

[0022] A controllable baffle system, including a spray gun baffle, wherein the spray gun baffle is rotatably installed at the outlet of each spray gun mechanism;

[0023] The control unit is electrically connected to the controllable baffle system and is used to send control signals to the controllable baffle system to adjust the spray gun baffle to open or close the outlet;

[0024] A projectile supply system, connected to each of the aforementioned spray gun mechanisms, is used to provide a solid medium;

[0025] A liquid supply system, connected to each of the spray gun mechanisms, is used to provide a liquid medium.

[0026] Furthermore, the spray angle of the spray gun mechanism is always perpendicular to the blade contact surface.

[0027] Furthermore, the size of the spray gun bracket is larger than the maximum external dimensions of the blade to be reinforced.

[0028] (III) Beneficial Effects

[0029] Compared with existing technologies, this invention provides a method and system for strengthening engine blades through zoned solid-liquid coupling. By integrating a controlled injection system, precise proportioning of the solid-liquid coupling medium, and regional processing strategies, it achieves localization and precision in shot peening. This method significantly improves the accuracy and manufacturing efficiency of blade surface processing, effectively reduces blade deformation caused by overall processing, and ensures that each region can obtain optimized strengthening effects according to its specific needs, significantly improving blade performance and service life. Furthermore, the solid-liquid coupled shot peening medium better wets the blade surface, reducing surface defects caused by medium interference, further enhancing the overall performance of the blade. Attached Figure Description

[0030] Figure 1 This is a structural schematic diagram of a blade shape disclosed in this application.

[0031] Figure 2 This is a front view schematic diagram of a spray gun bracket disclosed in this application.

[0032] Figure 3 This is a schematic diagram of the adjustment structure of a spray gun mechanism on a spray gun bracket disclosed in this application.

[0033] Figure 4 This is a schematic diagram of the structure of a spray gun baffle that is opened or closed, as disclosed in this application.

[0034] Figure 5 This is a schematic diagram of the structure of a blade disclosed in this application.

[0035] Figure 6 This is a schematic diagram of the structure of a partitioned solid-liquid coupling reinforcement system for engine blades disclosed in this application.

[0036] The reference numerals in the figure are as follows: 1. Spray gun bracket; 2. Spray gun mechanism; 3. Spray gun baffle; 4. Blade; 20. Spray gun; 101. Mounting hole. Detailed Implementation

[0037] The present invention will now be described in detail with reference to the accompanying drawings, and the technical solutions in the embodiments of the present invention will be clearly and completely described. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0038] It should be noted that when a component is described as "fixed to" another component, it can be directly on the other component or may have a component in between. When a component is considered "connected to" another component, it can be directly connected to the other component or may have a component in between. When a component is considered "set on" another component, it can be directly set on the other component or may have a component in between. The terms "vertical," "horizontal," "left," "right," and similar expressions used in this document are for illustrative purposes only.

[0039] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used herein in the description of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0040] This invention provides a method for strengthening engine blades through partitioned solid-liquid coupling. The specific implementation of this invention will be described in detail below with reference to the accompanying drawings and embodiments.

[0041] refer to Figure 1 , Figure 2A flexible spray gun holder 1 was designed and manufactured. This spray gun holder 1 is designed based on the maximum external dimensions (L1, W1) of the blade 4 being processed, ensuring that both the length (L) and width (W) of the spray gun holder 1 are greater than the external dimensions of the blade 4 (i.e., L>L1, W>W1). The spray gun holder 1 is equipped with multiple spray gun mechanisms 2, and the front-to-back distance and spray angle between each spray gun mechanism 2 can be adjusted manually or via a CNC system (e.g., ...). Figure 3 (as shown), so that the blades 4 can be flexibly arranged according to their curved surfaces. All spray guns 20 of the spray gun mechanism 2 are equipped with spray gun baffles 3 (as shown). Figure 3 , Figure 4 (As shown), to facilitate control of the shot peening process.

[0042] Based on the internal and external structural characteristics of blade 4 and the requirements of the service environment, the surface of blade 4 is divided into several different zones (A1, A2, A3...Ai), and the shot peening intensity is designed separately for each zone (see...). Figure 4 ).

[0043] Based on the shot peening intensity designed for each zone, specific strengthening process parameters for different zones are determined, including shot peening strengthening gas pressure, shot peening distance (d1, d2, d3...di), shot peening time, and coupling concentration of the shot peening medium. Considering the curved surfaces of each zone of blade 4, the spray gun mechanism 2 is arranged to conform to the shape to ensure that the shot peening incident angle is constant at 90 degrees (see...). Figure 5 In this process, water or oil can be used as the liquid phase medium for shot peening, while glass, ceramic, or steel shot can be used as the solid phase medium. For blade materials that are prone to reaction with water or have poor corrosion resistance, oil is chosen as the liquid phase medium.

[0044] Before commencing the shot peening process, a surface pretreatment is performed. The supply of the solid medium is shut off, setting the coupling concentration of the solid and liquid media to 0%. The equipment is then started, and all spray gun baffles 3 in the shot peening area of ​​blade 4 are opened. Only the liquid medium is used to clean the surface of blade 4 to remove adhering impurities. After cleaning, the spray gun baffles 3 are closed, and the shot peening operation is stopped.

[0045] Based on the process parameters determined in the preceding steps, a shot peening control program is developed. Parameters such as shot peening strengthening gas pressure, shot peening distance, shot peening time, and coupling concentration of the shot peening medium are set for each zone's shot peening gun 20. The on / off time of the shot peening gun 20 is set according to the different shot peening times. Upon initial startup, the coupling concentration of the solid and liquid media is adjusted. Once the concentration reaches the preset value and stabilizes, the shot peening program is run, and all shot peening gun baffles 3 are opened simultaneously to strengthen the surface of the blades 4. As the strengthening process progresses, the program automatically closes the shot peening gun baffles 3 in different zones. After the program ends, the equipment operation is stopped. During the coupled shot peening process of solid and liquid media, the liquid media lubricates the blade surface and the shot peening medium, reducing friction, avoiding excessive wear, maintaining the consistency of the shot peening effect, and improving surface smoothness. The liquid media also acts as a heat exchange medium during the strengthening process, helping to disperse locally generated heat.

[0046] After the strengthening process is complete, set the coupling concentration of the solid and liquid media back to 0% or close the shot inlet, start the equipment, and open all spray gun baffles 3. Use the liquid media to perform a secondary cleaning of the blade 4 surface to remove any residual impurities generated during the strengthening process. After cleaning, close the spray gun baffles 3 and terminate the shot peening operation.

[0047] The above methods can effectively perform local or comprehensive surface strengthening treatment on engine blades 4, thereby improving their wear resistance, fatigue resistance and service life.

[0048] The second aspect of this embodiment provides a partitioned solid-liquid coupling strengthening system for engine blades, used to perform the above-described strengthening method. For example... Figure 6 As shown, the enhancement system mainly includes:

[0049] The spray gun bracket 1 is equipped with multiple mounting holes 101, and the size of the spray gun bracket 1 is larger than the maximum external dimensions of the blade 4 to be reinforced, so as to provide sufficient installation and adjustment space for the spray gun mechanism 2. In some embodiments, the spray gun bracket 1 can be a cylindrical structure, and the blade 4 is clamped in the middle of the cylindrical structure to achieve simultaneous reinforcement processing in all directions at 360°.

[0050] A position adjustment mechanism, located on each mounting hole 101, allows the spray gun mechanism 2 to be finely adjusted in three-dimensional space to fit the curved shape of the blade 4. In some preferred embodiments, the position adjustment mechanism can be a universal adjuster.

[0051] Each spray gun mechanism 2 is mounted on a corresponding position adjustment mechanism and can perform precise shot peening operations according to program instructions. All spray guns 20 of all spray gun mechanisms 2 are equipped with a controllable baffle system to achieve precise control of the shot peening flow rate and direction.

[0052] The control unit, electrically connected to the controllable baffle system, is responsible for sending signals to adjust the opening and closing of the spray gun baffle 3, ensuring the precise execution of shot peening.

[0053] The shot supply system, connected to each spray gun mechanism 2, is responsible for supplying the selected solid medium, such as glass, ceramic, or steel shot.

[0054] The liquid supply system is also connected to each spray gun mechanism 2, providing the required liquid medium to complete the cleaning and strengthening process of the blades 4.

[0055] By integrating the above components, this strengthening system ensures that the spray angle of the spray gun mechanism 2 is always perpendicular to the contact surface of the blade 4, thereby ensuring the uniformity and efficiency of shot peening.

[0056] Compared with existing technologies, this invention provides a more precise and efficient blade surface strengthening scheme. Through solid-liquid coupling strengthening technology, it significantly improves blade performance and extends its service life. Simultaneously, the shot peening medium and control strategy employed reduce defects and deformations caused by improper treatment, ensuring the dimensional and morphological accuracy of the blades.

[0057] Therefore, the embodiments should be considered exemplary and non-limiting in all respects. The scope of this application is defined by the appended claims rather than the foregoing description, and all variations falling within the meaning and scope of equivalents of the claims are intended to be embraced within this application. No reference numerals in the claims should be construed as limiting the scope of the claims. Furthermore, it is clear that the word "comprising" does not exclude other units or steps, and the singular does not exclude the plural. Multiple units or devices recited in the apparatus claims may also be implemented by the same unit or device in software or hardware. The terms "first," "second," etc., are used to indicate names and do not indicate any particular order.

[0058] The above embodiments are only used to illustrate the technical solutions of this application and are not intended to limit it. Although this application has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of this application without departing from the spirit and scope of the technical solutions of this application.

Claims

1. A method for strengthening a partitioned solid-liquid coupling of an engine blade, characterized by, Includes the following steps: The spray gun bracket is designed according to the maximum external dimensions of the blades to be reinforced. Based on the internal and external structural characteristics of the blades and the requirements of the service environment, the blade surface is divided into different zones, and a corresponding shot peening intensity is designed for each zone. Based on the shot peening intensity designed for each zone, the strengthening process parameters for different zones are formulated, and the spray gun mechanism is arranged in accordance with the shape of the blade surface. Before intensification, the blade surface is cleaned with a liquid medium; After cleaning, a shot peening control program is developed based on the determined strengthening process parameters. The coupling concentration of the solid and liquid media is adjusted and the shot peening control program is run. The spray gun mechanism of each zone is activated to perform surface strengthening. After the surface strengthening treatment is completed, the blade surface is cleaned again using a liquid medium; The spray gun bracket is a cylindrical structure, with the blades clamped in the middle of the cylindrical structure to achieve simultaneous 360° all-round strengthening processing. The shot peening strengthening air pressure, shot peening distance, shot peening time and shot peening medium coupling concentration of each zone spray gun are set, and the on / off time of the spray gun is set according to the shot peening time.

2. The method for strengthening engine blades through partitioned solid-liquid coupling according to claim 1, characterized in that, The liquid phase medium is selected from water or oil, and the solid phase medium is selected from glass, ceramic or steel shot.

3. The method for strengthening engine blades through partitioned solid-liquid coupling according to claim 1, characterized in that, The strengthening process parameters include shot peening strengthening gas pressure, shot peening distance, shot peening time, and coupling concentration of the shot peening medium.

4. The method for strengthening engine blades through partitioned solid-liquid coupling according to claim 1, characterized in that, The shot peening incident angle of the spray gun mechanism is 90°.

5. The method for strengthening engine blades through partitioned solid-liquid coupling according to claim 1, characterized in that, All spray guns in the spray gun mechanism are equipped with spray gun baffles. When cleaning the blade surface with liquid medium, the coupling concentration value of solid medium and liquid medium is set to 0% or the inlet of solid medium is closed and the spray gun baffle is opened.

6. A zoned solid-liquid coupling reinforcement system for engine blades, characterized in that, The system for performing the enhancement method according to any one of claims 1-5 includes: The spray gun holder is equipped with multiple mounting holes; A position adjustment mechanism is provided on each of the mounting holes; The spray gun mechanism is provided on each of the position adjustment mechanisms; A controllable baffle system, including a spray gun baffle, wherein the spray gun baffle is rotatably installed at the outlet of each spray gun mechanism; The control unit is electrically connected to the controllable baffle system and is used to send control signals to the controllable baffle system to adjust the spray gun baffle to open or close the outlet; A projectile supply system, connected to each of the aforementioned spray gun mechanisms, is used to provide a solid medium; A liquid supply system, connected to each of the spray gun mechanisms, is used to provide a liquid medium.

7. The engine blade partitioned solid-liquid coupling reinforcement system according to claim 6, characterized in that, The spray angle of the spray gun mechanism is always perpendicular to the blade contact surface.

8. The engine blade partition solid-liquid coupling reinforcement system according to claim 6, characterized in that, The size of the spray gun holder is larger than the maximum external dimensions of the blade to be reinforced.

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