A method for controlling deformation of an engine integral blade disk by shot peening

Abstract

This invention relates to a method for controlling deformation during shot peening of an integral bladed disk (IBD) for engine, comprising the following steps: shot peening a test IBD component; statistically analyzing the deformation of each blade during shot peening of the test IBD component to obtain shot peening process parameters and blade deformation statistics; formulating a deformation compensation strategy; establishing a blade deformation compensation model based on the shot peening process parameters and blade deformation statistics to determine the blade machining shape adjustment amount to compensate for the shot peening deformation of the blade; machining the IBD blades according to the machining shape adjustment amount to compensate for the shot peening deformation of the blades in advance; shot peening the IBD blades using the shot peening process parameters; measuring whether the shape of the IBD blades meets the design specifications; and correcting the shape of the IBD blades, effectively solving the problem of out-of-tolerance blade shape during machining and after shot peening of the IBD blades.

Description

Technical Field

[0001] The invention relates to the technical field of surface strengthening, and in particular to a method for controlling deformation of an integral engine blade disk by shot peening. Background Art

[0002] The integral blade disk is the core component of the new generation of aircraft engines to achieve structural innovation and technological breakthroughs, and is also a key structure used in high-efficiency, low-fuel-consumption aircraft engines. The compressors of advanced civil aircraft engines all use integral blade disks to achieve the purpose of weight reduction, efficiency improvement, simplified parts structure and improved reliability. The integral blade disk structure is also widely used in the design of new aircraft engines in my country, but the manufacturing technology of the integral blade disk started late and is still in the exploration and verification stage. The product consistency is poor, the pass rate is low, the efficiency is low, and the cost is high. Among them, the low fatigue life and poor stability are one of the bottlenecks restricting the development and production of aircraft engines in my country.

[0003] Shot peening is a surface treatment method that uses high-speed projectiles to impact the surface of the workpiece, regulate the surface state of the material surface, such as the microstructure and residual stress distribution, thereby improving the material's fatigue strength, micro-fatigue resistance and damage tolerance performance. Shot peening can effectively improve and enhance the fatigue resistance of materials and parts, and is a surface strengthening technology widely used in the aerospace field. However, while the shot peening process improves performance, it can also cause deformation of components, resulting in excessive dimensions of parts and even the scrapping of parts. For complex structural parts such as integral blades, the blade strengthening is limited by the spatial structure, and the blades are complex thin-walled structures. The deformation of the blades after shot peening is relatively large. In addition, due to its complex manufacturing process, the state of the blade blank, heat treatment process, machining process, etc. will also affect the internal stress state of the integral blade, and then affect the deformation degree of the blade after shot peening. Therefore, the deformation of the integral blade after shot peening is extremely difficult to control.

[0004] At present, the deformation control of the integral blade disc by shot peening mainly adopts the double-sided shot peening method to control the deformation of the blade. After the double-sided shot peening process, the deformation of the blade has been greatly improved, but it still cannot meet the model design requirements. The problem of shot peening deformation is a long-term unresolved technical problem in the development of integral blade discs in my country's engines, which seriously restricts the development and production of integral blade discs, and further affects the overall development of various models of engines. The problem of shot peening deformation control needs to be solved urgently. Summary of the invention

[0005] 1. Technical issues to be resolved

[0006] Aiming at the deformation control problem of the blades of an engine integral blisk after shot peening, the present invention proposes a deformation control method for the shot peening of an engine integral blisk, which can effectively solve the problem of blade shape out-of-tolerance after machining and shot peening of the integral blisk, improve the processing quality and performance level of the integral blisk, and meet the model design requirements.

[0007] (II) Technical solution

[0008] An embodiment of the present invention proposes a method for controlling the shot peening deformation of an engine integral blade disk, comprising the steps of: shot peening an integral blade disk test piece, statistically analyzing the shot peening deformation of each blade of the integral blade disk test piece, and obtaining shot peening process parameters and blade deformation statistical data; formulating a deformation compensation strategy, establishing a deformation compensation digital model of the blade according to the shot peening process parameters and the blade deformation statistical data, determining the machining shape adjustment amount of the blade, and compensating for the shot peening deformation of the blade; machining the blades of the integral blade disk according to the machining shape adjustment amount to compensate for the shot peening deformation of the blade in advance; shot peening the blades of the integral blade disk using shot peening process parameters; measuring whether the shape of the blades of the integral blade disk meets the design indicators; and calibrating the shape of the blades of the integral blade disk.

[0009] Furthermore, the deformation compensation numerical model of the blade is: Δδ=K·(1+A)·δ; wherein Δδ is the machining shape adjustment amount, K is the material correlation coefficient, A is the shot peening intensity correlation coefficient of 0.1 to 0.5, and δ is the blade deformation amount.

[0010] Furthermore, the shot peening strengthens the blades by using a rebound spray gun with a single-side opening to perform double-sided spray strengthening.

[0011] Furthermore, the effective length of the spray gun is L, the span length of the blade is L1, and the chord length of the blade is L2. The relationship between the effective length of the spray gun and the span length and chord length of the blade satisfies 0.05≤(L-L1) / L1≤0.5 and / or 0.05≤(L-L2) / L2≤0.5.

[0012] Furthermore, the shot peening process parameters include shot peening intensity and coverage, and the shot peening intensity is A i The coverage is C%, and different blades use the same shot peening process parameters, where the shot peening intensity A i Satisfy A1≤A i ≤A2, coverage C% satisfies C%≥100%.

[0013] Furthermore, the shot peening strengthening of the blades of the integral blade disk is carried out by designing and compiling a double-sided shot peening program according to the shot peening strengthening process parameters.

[0014] Furthermore, when correcting the shape of the blades of the integral blade disk, if there is an out-of-tolerance item in the shape of individual blades, then under the same shot medium conditions, the shot peening intensity A1~A2 is selected within the shot peening intensity range. j As the process parameters for shot peening and shaping, and satisfying A2>A j >A i , and then perform local shot peening on the shaping area of ​​the blades with out-of-tolerance shapes.

[0015] Furthermore, the correction area is the range of (5% to 20%)·L1 on both sides of the blade out-of-tolerance cross section, and the shot peening path is designed to be along the chord direction and / or span direction of the blade.

[0016] (III) Beneficial effects

[0017] In summary, the present invention establishes a deformation compensation digital model of the blade based on the shot peening data of the integral blade disk test piece, compensates for the shot peening deformation of the blade in advance, and then uses the shot peening process parameters to shot peen the blades of the integral blade disk, so that the shot peening deformation of the blades of the integral blade disk is effectively controlled within the range permitted by the technical requirements. This solves the long-standing unresolved technical problem of shot peening deformation in the development of integral blade disks of engines in my country, effectively solves the problem of out-of-tolerance blade shape after machining and shot peening of the integral blade disk, can guarantee and promote the development of various types of engines, avoid the risk of scrapping the integral blade disk of the engine that has been put into production, effectively improve its precision, quality and performance, and has huge technical and economic benefits. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for use in the embodiments of the present invention are briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0019] Figure 1 It is a schematic diagram of the blade structure of the integral blade disk;

[0020] Figure 2 It is a schematic diagram of the structure of a spray gun. DETAILED DESCRIPTION

[0021] The following is a further detailed description of the embodiments of the present invention in conjunction with the accompanying drawings and examples. The detailed description of the following embodiments and the accompanying drawings are used to exemplarily illustrate the principles of the present invention, but cannot be used to limit the scope of the present invention, that is, the present invention is not limited to the described embodiments, and covers any modification, replacement and improvement of parts, components and connection modes without departing from the spirit of the present invention.

[0022] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present application can be combined with each other. The present application will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0023] The embodiment of the present invention provides a method for controlling deformation of an engine blisk by shot peening, comprising the steps of:

[0024] The integral blade disk test piece was shot peened, and the shot peening deformation of each blade of the integral blade disk test piece was statistically analyzed to obtain the shot peening process parameters and blade deformation statistics.

[0025] Formulate a deformation compensation strategy, establish a deformation compensation digital model of the blade based on the shot peening process parameters and the blade deformation statistics, determine the adjustment amount of the blade's machining shape, and compensate for the blade's shot peening deformation.

[0026] The blades of the integral blisk are machined according to the machining shape adjustment amount to compensate for the shot peening deformation of the blades in advance.

[0027] The blades of the integral blisk are shot peened using shot peening process parameters.

[0028] Measure whether the shape of the blades of the integral blisk meets the design specifications.

[0029] Calibrate the shape of the blades of the integral blisk.

[0030] By establishing a deformation compensation digital model of the blade based on the shot peening data of the integral blade disk test piece, the shot peening deformation of the blade is compensated in advance, and then the shot peening process parameters are used to shot peen the blades of the integral blade disk. The shot peening deformation of the blades of the integral blade disk is effectively controlled within the range permitted by the technical requirements, which solves the long-standing technical problem of shot peening deformation in the development of integral blade disks of engines in my country, and effectively solves the problem of out-of-tolerance blade shape after machining and shot peening of the integral blade disk. It can guarantee and promote the development of various types of engines, avoid the risk of scrapping the integral blade disk of the engine that has been put into production, effectively improve its precision, quality and performance, and has huge technical and economic benefits.

[0031] The technical solution of the present invention includes:

[0032] 1. Design and manufacture of spray gun mechanism

[0033] According to the overall blade structure and blade spacing characteristics of the blisk, such as Figure 1 As shown, the blade is designed to be sprayed on both sides, such as Figure 2As shown, the structure of the spray gun can refer to a split inner cavity shot peening spray gun disclosed in Chinese Patent 201210475992.4. The effective length (L) of the spray gun should be designed to cover all areas in the span length (L1) and chord length (L2) directions of the blade, while not interfering with the blade. It is also necessary to minimize the loss of projectile energy and ensure the stability of the spray gun during operation, satisfying 0.05≤(L-L1) / L1≤0.5 and 0.05≤(L-L2) / L2≤0.5.

[0034] 2. Shot peening of integral blade disk test piece

[0035] The integral blade disk test piece is used for double-sided shot peening of the integral blade disk blade. The shot peening intensity of the blade area is A1~A2, and the coverage rate is ≥100%. Different blades use the same shot peening strengthening process parameters (shot peening intensity A1≤A i ≤A2, coverage C%), statistically analyze the shot peening deformation of each blade, and obtain the deformation statistics of the blade under certain shot peening process parameters.

[0036] 3. Deformation compensation strategy formulation

[0037] According to the deformation data of the blisk blade determined by the shot peening process test of the blisk blade, combined with the blade machining process parameters, the blade machining shape adjustment amount Δδ (shown in Formula 1) is determined to compensate for the shot peening deformation of the blade, and the blade deformation compensation digital model is established.

[0038] Δδ=K·(1+A)·δ (1)

[0039] Where K is the material correlation coefficient, A is the shot peening intensity correlation coefficient (0.1~0.5), and δ is the blade deformation.

[0040] 4. Machining compensation of blades

[0041] The established blade deformation compensation digital model is used to determine the machining process parameters to process the blades of the integral blade disk and compensate for the shot peening deformation of the blades in advance.

[0042] 5. Shot peening of the blades of the integral blisk after compensation

[0043] The shot peening process parameters determined in the previous period (shot peening intensity A i , coverage rate C%), design and compile the double-sided spraying program for the compensated integral blade disk blade, carry out double-sided spraying strengthening on the blade, and measure whether the blade shape after strengthening meets the design indicators.

[0044] 6. Blade shot peening and shaping

[0045] If there are still out-of-tolerance items in the shape of individual blades, select the corresponding specific process parameters shot peening intensity A under the same shot medium conditions and within a certain shot peening intensity range (A1~A2). j As the process parameters for shot peening and shaping, and satisfying A2>A j >A i Then, the blades with out-of-tolerance shapes are locally shot peened for correction. The correction area is within the range of (5% to 20%)·L1 on both sides of the blade out-of-tolerance section, and the shot peening path is designed to be along the chord direction or span direction of the blade.

[0046] It should be clear that the various embodiments in this specification are described in a progressive manner, and the same or similar parts between the various embodiments can be referred to each other, and each embodiment focuses on the differences from other embodiments. The present invention is not limited to the specific steps and structures described above and shown in the figures. In addition, for the sake of brevity, a detailed description of known methods and technologies is omitted here.

[0047] The above is only an embodiment of the present application and is not limited to the present application. For those skilled in the art, the present application may have various changes and variations without departing from the scope of the present invention. Any modification, equivalent substitution, improvement, etc. made within the spirit and principle of the present application should be included in the scope of the claims of the present application.

Claims

1. A method for controlling deformation of an engine blisk by shot peening, characterized in that: Includes steps: The integral blade disk test piece is used to perform double-sided shot peening strengthening on the integral blade disk blade. The shot peening intensity of the blade area is A1~A2, and the coverage rate is ≥100%. Different blades use the same shot peening strengthening process parameters, shot peening intensity A1 ≤A i ≤A2, coverage rate C%, and statistical analysis is performed on the shot peening strengthening deformation of each blade of the integral blade disk test piece to obtain the shot peening strengthening process parameters and blade deformation statistics; Formulate a deformation compensation strategy, establish a blade deformation compensation digital model based on the shot peening process parameters and the blade deformation statistics, determine the blade machining shape adjustment, and compensate for the blade shot peening deformation; the blade deformation compensation digital model is: Δδ=K·(1+A)·δ; wherein Δδ is the machining shape adjustment, K is the material correlation coefficient, A is the shot peening intensity correlation coefficient of 0.1 to 0.5, and δ is the blade deformation; The blades of the blisk are machined according to the machining profile adjustment amount to compensate for the shot peening deformation of the blades in advance; Use the shot peening intensity A determined in advance i , Coverage rate C% Design and compile double-sided spraying program for the compensated integral blade disk blade, perform double-sided spraying strengthening on the blade, and measure whether the blade shape after strengthening meets the design indicators; Measure whether the shape of the blades of the integral blisk meets the design specifications; Calibrate the shape of the blades of the integral blisk.

2. The method for controlling deformation of an engine blisk by shot peening according to claim 1, characterized in that: Shot peening uses a rebound spray gun with a single-side opening to spray and strengthen the blades on both sides.

3. The method for controlling deformation of an engine blisk by shot peening according to claim 2, characterized in that: The effective length of the spray gun is L, the span length of the blade is L1, and the chord length of the blade is L2. The relationship between the effective length of the spray gun and the span length and chord length of the blade satisfies 0.05≤(L-L1) / L1≤0.5 and / or 0.05≤(L-L2) / L2≤0.

5.

4. The method for controlling deformation of an engine blisk by shot peening according to claim 1, characterized in that: When correcting the shape of the blades of the integral blade disk, if there is an out-of-tolerance item in the shape of individual blades, under the same shot medium conditions, select the shot peening intensity A1 in the shot peening intensity range of A1 to A2. j As the process parameters for shot peening and correction, A2 >A j >A i , and then perform local shot peening on the shaping area of ​​the blades with out-of-tolerance shapes.

5. The method for controlling deformation of an engine blisk by shot peening according to claim 4, characterized in that: The correction area is the range of (5% to 20%)·L1 on both sides of the blade out-of-tolerance section, and the shot peening path is designed to be along the chord direction and / or span direction of the blade.

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