Shot peening method for small holes of turbine disk and shot peening positioning jig

Abstract

The application discloses a small-hole shot blasting method for a turbine disc, which comprises the following steps: first, a straight jet gun is used to perform shot blasting on an A-type test piece to obtain a device parameter range of the straight jet gun when the shot blasting strength of the turbine disc small hole meets the lower limit and the upper limit, and the device parameter range is defined as a first set of device parameters and a second set of device parameters respectively; then, the N-type test piece is shielded and shot blasted according to the first set of device parameters and the second set of device parameters respectively to obtain a shot blasting strength range of the shielded N-type test piece; then, the N-type test piece simulating the small hole of the turbine disc is subjected to the rotating lance shot blasting according to the converted shot blasting strength range of the N-type test piece to confirm a third set of device parameters of the rotating lance shot blasting; then, the moving speed Vt of the rotating lance is tested under the premise that the third set of device parameters is met and the small-hole shot blasting coverage reaches 100%; then, the moving speed V of the rotating lance is calculated when the shot blasting coverage of the small hole of the turbine disc is greater than or equal to 200%; and finally, the rotating lance is adjusted to work under the third set of device parameters and the moving speed V.

Description

Technical Field

[0001] This invention relates to the technical field of turbine disk machining, and in particular, to a method for small-hole shot peening of turbine disks. Furthermore, this invention also relates to a turbine disk shot peening positioning fixture for machining using the aforementioned small-hole shot peening method. Background Technology

[0002] High-temperature alloy turbine disks typically have multiple bolt holes for connection and installation in the web area. These bolt holes often have stress concentration characteristics. Therefore, if the strength at the bolt holes is insufficient during operation, fatigue cracks may appear around the bolt holes, which can even lead to turbine disk fracture and failure. Therefore, shot peening is usually used in the manufacturing process to form a pressure layer on the surface of the bolt holes to improve fatigue resistance.

[0003] When shot peening the bolt holes with a size of Φ7mm×35mm on the turbine disk, the shot peening range along the hole depth is limited due to the relatively large hole depth of the bolt holes. It is also difficult to extend into the small holes for shot peening, making it difficult to meet the requirements for shot peening coverage. As a result, the fatigue strength of the pressure layer after shot peening of the bolt holes is difficult to meet the requirements. Summary of the Invention

[0004] This invention provides a method for shot peening turbine disks through small holes, in order to solve the technical problem of how to achieve the required shot peening coverage after shot peening deep small holes in turbine disks.

[0005] According to one aspect of the present invention, a method for shot peening a turbine disk with small holes is provided, comprising the following steps:

[0006] Step S100: Select an unshielded Type A test piece, and perform shot peening on the Type A test piece by adjusting the shot peening equipment parameters of the direct injection gun to obtain the shot peening intensity of the Type A test piece under different shot peening equipment parameters. Compare with the process parameter range of shot peening intensity of the turbine disk orifice, select the shot peening equipment parameters corresponding to the direct injection gun when the shot peening intensity of the turbine disk orifice is at its minimum value and define it as the first set of equipment parameters. Select the shot peening equipment parameters corresponding to the direct injection gun when the shot peening intensity of the turbine disk orifice is at its maximum value and define them as the second set of equipment parameters.

[0007] Step S200: Select a partially shielded N-type test piece. After shielding, the N-type test piece forms a long groove for simulating the small holes of a turbine disk. Use the direct injection gun to perform shot peening on the long groove using the first set of equipment parameters, and obtain the shot peening intensity RmmN of the N-type test piece at this time. Use the direct injection gun to perform shot peening on the long groove using the second set of equipment parameters, and obtain the shot peening intensity HmmN of the direct injection gun at this time.

[0008] Step S300: Select a partially shielded N-type test piece. The N-type test piece is fixed on the worktable of the shot peening equipment by a test piece shot peening fixture. A shot peening hole is formed between the N-type test piece and the test piece shot peening fixture. The shot peening hole is shot peened by a rotating spear gun. The shot peening equipment parameters corresponding to the rotating spear gun when the shot peening intensity of the N-type test piece is in the range of RmmN~HmmN are obtained and defined as the third set of equipment parameters.

[0009] Step S400: Prepare a small hole specimen with the same hole structure as the turbine disk. After adjusting the rotating spear gun to the third set of equipment parameters, shot peening the small hole specimen. Obtain the moving speed Vt of the rotating spear gun when the small hole shot peening coverage reaches 100% after t seconds. Set the moving speed V of the rotating spear gun to ≤ 1 / 2Vt so that the small hole shot peening coverage is ≥ 200% to satisfy the requirement that the rotating spear gun moves at speed V to complete the secondary coverage of the small hole shot peening.

[0010] Step S500: The turbine disk is installed on the worktable of the shot peening equipment using a turbine disk shot peening positioning fixture. The rotating spear gun is moved into the small hole of the turbine disk and shot peening is performed by calling the CNC shot peening program. At the same time, the rotating spear gun is adjusted to the third set of equipment parameters and moving speed V for operation.

[0011] Further, in step S100, the process parameter range of the shot peening intensity of the small hole of the turbine disk is 0.1mmA to 0.15mmA. The shot peening equipment parameters corresponding to the direct spray gun when the shot peening intensity of the type A test piece is 0.1mmA are selected and defined as the first set of equipment parameters. The shot peening equipment parameters corresponding to the direct spray gun when the shot peening intensity of the type A test piece is 0.15mmA are selected and defined as the second set of equipment parameters.

[0012] Furthermore, in step S200, two baffles are provided on the shot-peened surface of the N-type test piece. The two baffles are spaced apart along the width direction of the N-type test piece and are joined with the N-type test piece to form a long groove.

[0013] Further, in step S300, the test piece shot peening fixture includes a base, a positioning shaft, and a test piece mounting plate. The base is mounted on the worktable of the shot peening equipment via the positioning shaft. The test piece mounting plate is fixed on the base and has a strip groove. An N-type test piece is mounted on the test piece mounting plate and covers the strip groove to form a shot peening hole for testing.

[0014] Furthermore, in step S300, the shot peening hole is a square hole, and the width of the shot peening hole is the same as the diameter of the small hole in the turbine disk.

[0015] Further, in step S500, the turbine disk shot peening positioning fixture includes a chassis, a cover plate, positioning bolts, and a fixing nut. The positioning bolts pass through the chassis, the turbine disk, and the cover plate in sequence and are threadedly connected to the fixing nut so that the turbine disk is installed between the chassis and the cover plate. The head of the positioning bolts mates with the center positioning hole of the shot peening equipment worktable so that the turbine disk shot peening positioning fixture is installed on the shot peening equipment worktable.

[0016] Furthermore, in step S500, a positioning pin is provided on the chassis. The positioning pin cooperates with the shot peening equipment worktable to position the chassis circumferentially relative to the shot peening equipment worktable and to provide a positioning reference for the CNC shot peening program.

[0017] Furthermore, the shot peening material is cast steel shot.

[0018] According to another aspect of the present invention, a turbine disk shot peening positioning fixture is also provided for positioning and fixing a turbine disk, and for shot peening the small holes on the turbine disk using the small hole shot peening method for turbine disks as described above, comprising:

[0019] The chassis has a mounting groove, and a positioning component is provided in the mounting groove. The positioning component is connected and fixed to the chassis by screws, and the positioning component is circumferentially positioned relative to the chassis. The end of the positioning component away from the chassis has a positioning groove for mounting the first end of the turbine disk, and the groove wall of the positioning groove is used to abut against the side wall of the first end of the turbine disk.

[0020] A cover plate, the cover plate including a clamping part for abutting against a second end portion of the turbine disk and a positioning part for embedding into a central hole of the turbine disk;

[0021] The fixing assembly includes a positioning bolt and a fixing nut. The positioning bolt passes through the chassis, the positioning element, the turbine disk, and the cover plate in sequence and is threadedly connected to the fixing nut so that the chassis and the cover plate press the turbine disk between them. The head of the positioning bolt is used to mate with the center positioning hole of the shot peening equipment worktable so that the chassis is mounted on the shot peening equipment worktable.

[0022] Furthermore, the chassis is provided with a positioning pin, which is used to cooperate with the shot peening equipment worktable to position the chassis circumferentially relative to the shot peening equipment worktable and to provide a positioning reference for pinhole shot peening.

[0023] The present invention has the following beneficial effects:

[0024] In the turbine disk orifice shot peening method of the present invention, the process parameter range of the shot peening intensity of the turbine disk orifice is first determined as a benchmark for obtaining the parameters of the direct-injection gun shot peening equipment. Specifically, the shot peening equipment parameters of the direct-injection gun are adjusted to directly shot peening an unshielded type A test piece to obtain the shot peening intensity of the direct-injection gun on the type A test piece under different shot peening equipment parameters. Then, the obtained shot peening intensity of the type A test piece is compared with the process parameter range of the shot peening intensity of the turbine disk orifice. The shot peening equipment parameters corresponding to the direct-injection gun when the shot peening intensity of the type A test piece matches the minimum value of the shot peening intensity of the turbine disk orifice are selected and defined as the first set of equipment parameters. The shot peening equipment parameters corresponding to the direct-injection gun when the shot peening intensity of the type A test piece matches the maximum value of the shot peening intensity of the turbine disk orifice are selected and defined as the second set of equipment parameters. This step is used to obtain the range of shot peening equipment parameters of the direct-injection gun that conform to the shot peening intensity range of the turbine disk orifice when the direct-injection gun is tested through the type A test piece.

[0025] Next, an N-type test piece is selected. The N-type test piece is masked to form a long groove simulating a turbine disk orifice. A direct-injection gun is then used to shot-penetrate the long groove using both the first and second sets of equipment parameters, and the shot peening intensity of the N-type test piece is obtained accordingly. This step is used to obtain the shot peening intensity range of the N-type test piece when the shot peening equipment parameters of the direct-injection gun, within the range that conforms to the shot peening intensity range for turbine disk orifices, are used to perform shot peening tests on the long groove simulating turbine disk orifices formed by the N-type test piece. This shot peening intensity range is RmmN to HmmN.

[0026] The N-type test piece is then fixed to the shot peening equipment's worktable using a shot peening fixture. At this point, a shot peening hole for testing is formed between the N-type test piece and the fixture. A rotating spear gun then peens the hole, and the shot peening equipment parameters corresponding to the rotating spear gun when the shot peening intensity of the N-type test piece is within the range of RmmN to HmmN are obtained and defined as the third set of equipment parameters. This step is used to confirm the shot peening equipment parameters of the rotating spear gun when performing shot peening tests on the long groove of the simulated turbine disk hole formed by the N-type test piece using the shot peening equipment parameter range of a direct-injection gun that conforms to the shot peening intensity range of the turbine disk hole.

[0027] Next, prepare a small-hole specimen with the same hole structure size as the turbine disk. After adjusting the rotating spear gun to the third set of equipment parameters, shot peening the small-hole specimen is performed. The moving speed Vt of the rotating spear gun when the small-hole shot peening coverage reaches 100% after t seconds is obtained. The moving speed V of the rotating spear gun is set to be ≤1 / 2Vt so that the small-hole shot peening coverage is ≥200%, so that the rotating spear gun can complete the secondary coverage of the small-hole shot peening after moving at a speed of V for t seconds. In this step, after adjusting the rotating spear gun to the third set of equipment parameters, shot peening the small hole specimen is to meet the shot peening intensity of the turbine disk small hole. The moving speed Vt of the rotating spear gun is tested to achieve a shot peening coverage of 100% for the small hole while meeting the shot peening intensity of the turbine disk small hole. Then, the moving speed V of the rotating spear gun is calculated to achieve a shot peening coverage of ≥200% for the turbine disk small hole. Shot peening the turbine disk small hole with this moving speed V is performed. On the one hand, it is to complete the repeated coverage of the small hole surface and further improve the fatigue strength. On the other hand, it is to improve the coverage tolerance during small hole shot peening and fill in the areas where the coverage is not up to standard during the initial coverage.

[0028] Finally, a turbine disk shot peening positioning fixture is used to mount the turbine disk on the shot peening equipment's worktable. The CNC shot peening program is then invoked to move the rotating spear gun into the small hole of the turbine disk for shot peening. Simultaneously, the rotating spear gun is adjusted to the third set of equipment parameters and the moving speed V. This step adjusts the rotating spear gun to the third set of equipment parameters and the moving speed V to ensure that the small hole of the turbine disk meets both the shot peening intensity and shot peening coverage requirements after shot peening.

[0029] In summary, the shot peening equipment parameters of the direct-fired gun were first obtained by testing the type A test piece to determine the shot peening intensity range that meets the requirements of the turbine disk orifice shot peening. Then, the shot peening intensity range of the type N test piece was obtained by shot peening the long groove of the simulated turbine disk orifice formed by the type N test piece according to the shot peening equipment parameters of the direct-fired gun that meet the requirements of the turbine disk orifice shot peening intensity range. Then, the shot peening intensity range of the type N test piece was used to confirm the shot peening equipment parameters of the rotating spear gun. Next, the moving speed Vt of the rotating spear gun was tested to achieve a shot peening coverage of 100% while meeting the shot peening intensity requirements of the turbine disk orifice. Then, the moving speed V of the rotating spear gun was calculated to achieve a shot peening coverage of ≥200% for the turbine disk orifice. Finally, the rotating spear gun was adjusted to the third set of equipment parameters and moving speed V to ensure that the turbine disk orifice simultaneously meets the shot peening intensity and shot peening coverage requirements after shot peening. The parameters of the direct-fire gun shot peening equipment were converted to those of the rotary spear gun shot peening equipment using type A and type N test pieces. The shot peening process was simulated using small-hole test pieces to determine the appropriate moving speed of the rotary spear gun for shot peening the small holes of the turbine disk, ensuring that the coverage rate met the requirements. Since the rotary spear gun can extend into the small holes for shot peening, it is convenient to perform shot peening on the small holes of the turbine disk. After confirming the shot peening equipment parameters and moving speed of the rotary spear gun, shot peening the small holes of the turbine disk can easily meet the shot peening intensity and coverage requirements, thereby improving the service life of the turbine disk.

[0030] In addition to the objectives, features, and advantages described above, the present invention has other objectives, features, and advantages. The invention will now be described in further detail with reference to the figures. Attached Figure Description

[0031] The accompanying drawings, which form part of this application, are used to provide a further understanding of the invention. The illustrative embodiments of the invention and their descriptions are used to explain the invention and do not constitute an undue limitation of the invention. In the drawings:

[0032] Figure 1 This is a schematic diagram of shot peening a type A specimen with a direct-injection gun according to a preferred embodiment of the present invention;

[0033] Figure 2 This is a schematic diagram of shot peening an N-type specimen with a direct-injection gun according to a preferred embodiment of the present invention;

[0034] Figure 3 This is a schematic diagram of the structure of the test piece shot peening fixture according to a preferred embodiment of the present invention;

[0035] Figure 4 This is a schematic diagram of a rotating spear gun peening an N-type test piece according to a preferred embodiment of the present invention;

[0036] Figure 5 This is a schematic diagram of the shot peening hole structure of a preferred embodiment of the present invention;

[0037] Figure 6 This is a schematic diagram of the turbine disk shot peening positioning fixture according to a preferred embodiment of the present invention;

[0038] Figure 7 This is a schematic diagram of the installation of the turbine disk according to a preferred embodiment of the present invention.

[0039] Legend:

[0040] 100. Direct spray gun; 101. Rotary spear gun;

[0041] 200, Type A test piece;

[0042] 300, N-type test piece;

[0043] 400. Specimen shot peening fixture; 401. Base; 402. Positioning shaft; 403. Specimen mounting plate; 404. Strip groove; 405. Shot peening hole;

[0044] 500. Chassis; 501. Positioning component; 502. Positioning groove; 503. Screw; 504. Positioning pin;

[0045] 600. Cover plate; 601. Pressing part; 602. Positioning part;

[0046] 700. Locating bolt; 701. Fixing nut;

[0047] 800, turbine disk. Detailed Implementation

[0048] The embodiments of the present invention will be described in detail below with reference to the accompanying drawings. However, the present invention can be implemented in many different ways as defined and covered below.

[0049] like Figures 1 to 7 As shown, a method for shot peening a turbine disk using small holes in this embodiment includes the following steps:

[0050] Step S100: Select an unshielded Type A test piece 200, and perform shot peening on the Type A test piece 200 by adjusting the shot peening equipment parameters of the direct spray gun 100 to obtain the shot peening intensity of the Type A test piece 200 under different shot peening equipment parameters. Compare with the process parameter range of shot peening intensity of the small holes of the turbine disk 800, select the shot peening equipment parameters corresponding to the direct spray gun 100 when the shot peening intensity of the small holes of the turbine disk 800 is at its minimum value and define it as the first set of equipment parameters. Select the shot peening equipment parameters corresponding to the direct spray gun 100 when the shot peening intensity of the small holes of the turbine disk 800 is at its maximum value and define them as the second set of equipment parameters.

[0051] Step S200: Select a partially shielded N-type test piece 300. After shielding, the N-type test piece 300 forms a long groove for simulating the small holes of the turbine disk 800. Use the direct spray gun 100 to perform shot peening on the long groove using the first set of equipment parameters, and obtain the shot peening intensity RmmN of the N-type test piece 300 at this time. Use the direct spray gun 100 to perform shot peening on the long groove using the second set of equipment parameters, and obtain the shot peening intensity HmmN of the direct spray gun 100 at this time.

[0052] Step S300: Select an N-type test piece 300. The N-type test piece 300 is fixed on the worktable of the shot peening equipment by the test piece shot peening fixture 400. A shot peening hole 405 is formed between the N-type test piece 300 and the test piece shot peening fixture 400. The shot peening hole 405 is shot peened by the rotating spear gun 101. The shot peening equipment parameters corresponding to the rotating spear gun 101 when the shot peening intensity of the N-type test piece 300 is in the range of RmmN~HmmN are obtained and defined as the third set of equipment parameters.

[0053] Step S400: Prepare a small hole specimen with the same hole structure as the turbine disk 800. After adjusting the rotating spear gun 101 to the third set of equipment parameters, perform shot peening on the small hole specimen. Obtain the moving speed Vt of the rotating spear gun 101 when the small hole shot peening coverage reaches 100% after t seconds. Set the moving speed V of the rotating spear gun 101 to ≤ 1 / 2Vt so that the small hole shot peening coverage is ≥ 200% to satisfy the requirement that the rotating spear gun 101 moves at speed V to complete the secondary coverage of the small hole shot peening.

[0054] Step S500: Use the turbine disk 800 shot peening positioning fixture to install the turbine disk 800 on the worktable of the shot peening equipment. By calling the CNC shot peening program, move the rotating spear gun 101 into the small hole of the turbine disk 800 and perform shot peening. At the same time, adjust the rotating spear gun 101 to the third set of equipment parameters and moving speed V for operation.

[0055] In the above steps, both type A test piece 200 and type N test piece 300 are shot peening test pieces used for shot peening testing. The thickness of type N test piece 300 is approximately 1 / 3 of the thickness of type A test piece 200. Therefore, type N test piece 300 is relatively sensitive and suitable for small-scale shot peening intensity testing. Specifically, when the test piece is blocked, the arc height value of the shot peening saturation parameter will become smaller. Therefore, a thinner type N test piece 300 is needed to improve sensitivity and facilitate the plotting of the shot peening saturation parameter curve. Therefore, when simulating small holes for testing in the above steps, type N test piece 300 is used for testing and observation.

[0056] In step S100, the shot peening equipment parameters refer to parameters such as shot peening gas pressure, shot flow rate, spray distance, and spray angle. Multiple selected type A test pieces 200 are shot peened using a direct-fired shot blasting gun 100. Specifically, cast steel shot ASH70 is used, and the type A test pieces 200 are shot peened using the direct-fired shot blasting gun 100. The shot peening equipment parameters of the direct-fired shot blasting gun 100 are adjusted, and a shot peening saturation curve is plotted. Based on the shot peening saturation curve, the shot peening performance of the type A test pieces 200 under different shot peening equipment parameters is obtained. The process parameters for shot peening of the A-type test piece 200 and the orifice of the turbine disk 800 are compared. The shot peening equipment parameters corresponding to the direct-injection gun 100 when the minimum values ​​of the shot peening intensity of the A-type test piece 200 and the orifice of the turbine disk 800 are matched are defined as the first set of equipment parameters. The shot peening equipment parameters corresponding to the direct-injection gun 100 when the maximum values ​​of the shot peening intensity of the A-type test piece 200 and the orifice of the turbine disk 800 are matched are defined as the second set of equipment parameters. This step is used to obtain the range of shot peening equipment parameters for the direct-injection gun 100 when it meets the shot peening intensity range of the turbine disk 800 orifice when tested with the A-type test piece 200, which will be used as a parameter benchmark in subsequent steps.

[0057] Reference Figure 2 In step S200, an N-type test piece 300 is selected. The N-type test piece 300 is masked to form a long groove simulating the small holes of a turbine disk 800. This serves two purposes: firstly, it simulates the shot peening of the turbine disk 800 holes; secondly, masking reduces the arc height of the plotted shot peening saturation parameters, necessitating a thinner N-type test piece 300 to improve sensitivity and facilitate the plotting of the shot peening saturation parameter curve. The direct-injection gun 100 is used to peen the long groove with the first and second sets of equipment parameters, and the shot peening intensity of the N-type test piece 300 is obtained accordingly. This step is used to obtain the shot peening intensity range of the N-type test piece 300 when the shot peening equipment parameters of the direct-injection gun 100, within the range of shot peening intensity for the turbine disk 800 holes, are used for shot peening tests. This shot peening intensity range is RmmN to HmmN.

[0058] Reference Figure 4In step S300, the N-type test piece 300 is fixed on the worktable of the shot peening equipment using the shot peening fixture. At this time, a shot peening hole 405 for testing is formed between the N-type test piece 300 and the test piece shot peening fixture 400. The shot peening hole 405 is a square hole, and the width of the shot peening hole 405 is the same as the diameter of the small hole of the turbine disk 800. Shot peening is performed on the shot peening hole 405 to simulate the actual shot peening situation of the turbine small hole. Then, the shot peening hole 405 is shot peened by the rotating spear gun 101, and the shot peening saturation curve of the N-type test piece 300 is plotted. Referring to the shot peening saturation curve, the shot peening equipment parameters corresponding to the rotating spear gun 101 when the shot peening intensity of the N-type test piece 300 is in the range of RmmN to HmmN are obtained and defined as the third set of equipment parameters. This step is used to obtain the shot peening equipment parameters of the rotating spear gun 101 when performing shot peening tests on the shot peening holes 405 formed by the rotating spear gun 101 on the N-type test piece 300 to simulate the small holes of the turbine disk 800. This is done when the shot peening equipment parameters of the direct-fired gun 100, which are within the shot peening intensity range of the turbine disk 800 small holes, are used to perform shot peening tests on the long groove formed by the N-type test piece 300 to simulate the small holes of the turbine disk 800. The rotating spear gun 101 has an outer diameter of φ4mm and an inner diameter of φ2mm, so this shot peening strengthening process method can also be extended to the field of machining small holes with apertures of φ(6~20)mm in other parts.

[0059] For step S400, prepare a small hole specimen with the same hole structure size as the turbine disk 800. After adjusting the rotating spear gun 101 to the third set of equipment parameters, shot peening the small hole specimen is performed. The moving speed Vt of the rotating spear gun 101 when the small hole shot peening coverage reaches 100% after t seconds is obtained. The moving speed V of the rotating spear gun 101 is set to be ≤1 / 2Vt so that the small hole shot peening coverage is ≥200%, so that the rotating spear gun 101 can complete the secondary coverage of the small hole shot peening after moving at a speed of V for t seconds. In this step, after the rotating spear gun 101 is adjusted to the third set of equipment parameters, shot peening of the small hole specimen is performed to meet the shot peening intensity of the turbine disk 800 small holes. The moving speed Vt of the rotating spear gun 101 is tested to achieve a shot peening coverage of 100% for the small holes while meeting the shot peening intensity of the turbine disk 800 small holes. Then, the moving speed V of the rotating spear gun 101 is calculated to achieve a shot peening coverage of ≥200% for the turbine disk 800 small holes. Shot peening of the turbine disk 800 small holes is performed using this moving speed V. On the one hand, this is to complete the repeated coverage of the small hole surface and further improve the fatigue strength. On the other hand, it is to improve the coverage tolerance during small hole shot peening and fill in the areas where the coverage is not up to standard during the initial coverage.

[0060] In step S500, a turbine disk 800 is mounted on the shot peening equipment worktable using a turbine disk shot peening positioning fixture. The rotating spear gun 101 is moved into the small hole of the turbine disk 800 and shot peening is performed by calling the CNC shot peening program. Simultaneously, the rotating spear gun 101 is adjusted to the third set of equipment parameters and the moving speed V. This step adjusts the rotating spear gun 101 to the third set of equipment parameters and the moving speed V to ensure that the small hole of the turbine disk 800 meets both the shot peening intensity and shot peening coverage requirements after shot peening.

[0061] In summary, firstly, by testing the type A test piece 200, the shot peening equipment parameter range of the direct-fired gun 100 that meets the shot peening intensity range of the turbine disk 800 orifice was obtained. Then, the shot peening intensity range of the type N test piece 300 was obtained by shot peening the long groove simulating the turbine disk 800 orifice formed by the type N test piece 300 according to the shot peening equipment parameter range of the direct-fired gun 100 that meets the shot peening intensity range of the turbine disk 800 orifice. Finally, the rotating spear gun was confirmed using the shot peening intensity range of the type N test piece 300. The parameters of the shot peening equipment 101 are then tested. The moving speed Vt of the rotating spear gun 101 is then tested to achieve a shot peening coverage of 100% while meeting the shot peening intensity of the turbine disk 800 holes. The moving speed V of the rotating spear gun 101 is then calculated to achieve a shot peening coverage of ≥200% for the turbine disk 800 holes. Finally, the rotating spear gun 101 is adjusted to the third set of equipment parameters and moving speed V to ensure that the turbine disk 800 holes meet both the shot peening intensity and shot peening coverage requirements after shot peening. The shot peening parameters of the direct-fire gun 100 are converted to those of the rotary spear gun 101 using type A test piece 200 and type N test piece 300. The shot peening process is simulated using a small-hole test piece to determine the appropriate moving speed of the rotary spear gun 101 for shot peening the small holes of the turbine disk 800, ensuring that the coverage meets the requirements. Since the rotary spear gun 101 can extend into the small holes for shot peening, it is convenient to perform shot peening on the small holes of the turbine disk 800. After confirming the shot peening parameters and moving speed of the rotary spear gun 101, shot peening the small holes of the turbine disk 800 can easily meet the shot peening intensity and coverage requirements, thereby improving the service life of the turbine disk 800.

[0062] Further, in step S100, the process parameter range of the shot peening intensity of the small holes of the turbine disk 800 is 0.1mmA to 0.15mmA. The shot peening equipment parameters corresponding to the direct spray gun 100 when the shot peening intensity of the type A test piece 200 is 0.1mmA are selected and defined as the first set of equipment parameters. The shot peening equipment parameters corresponding to the direct spray gun 100 when the shot peening intensity of the type A test piece 200 is 0.15mmA are selected and defined as the second set of equipment parameters.

[0063] In this embodiment, the process parameter range for the shot peening intensity of the small holes in the turbine disk 800 is 0.1 mmA to 0.15 mmA, which is the theoretical range. The shot peening saturation curve is plotted after shot peening the type A test piece 200 by adjusting the shot peening equipment parameters of the direct spray gun 100. The shot peening equipment parameters of the direct spray gun 100 when the shot peening intensity of the type A test piece 200 is 0.1 mmA are obtained as the first set of equipment parameters, and the shot peening equipment parameters of the direct spray gun 100 when the shot peening intensity is 0.15 mmA are obtained as the second set of equipment parameters.

[0064] Furthermore, in step S200, two baffles are provided on the shot-peened surface of the N-type test piece 300. The two baffles are spaced apart along the width direction of the N-type test piece 300 and are joined with the N-type test piece 300 to form a long groove.

[0065] In this embodiment, two baffles are spaced apart on the shot-peened surface of the N-type test piece 300, forming a long groove with the N-type test piece 300. The width and depth of the long groove are equal, and the diameter of the small hole of the turbine disk 800 is the same.

[0066] Reference Figures 3-5 In step S300, the test piece shot peening fixture 400 includes a base 401, a positioning shaft 402, and a test piece mounting plate 403. The base 401 is mounted on the worktable of the shot peening equipment via the positioning shaft 402. The test piece mounting plate 403 is fixed on the base 401 and has a strip groove 404. An N-type test piece 300 is mounted on the test piece mounting plate 403 and covers the strip groove 404 to form a shot peening hole 405 for testing.

[0067] In this embodiment, the base 401 is circular. The positioning shaft 402 is coaxially arranged with the base 401 and located on the lower surface of the base 401. The positioning shaft 402 is used to cooperate with the center hole of the shot peening equipment worktable so that the base 401 is installed in the working position on the shot peening equipment worktable. In order to prevent the base 401 from shaking during shot peening and affecting the test data, a pressure plate can be set to be placed on the upper surface of the base 401 so that the lower surface of the base 401 is in contact with the shot peening equipment worktable, so that the base 401 is installed stably. The test piece mounting plate 403 is installed on the upper surface of the base 401, and a strip groove 404 is opened on the test piece mounting plate 403. The N-type test piece 300 is fixed on the test piece mounting plate 403 by pan head screws 503 and covers the strip groove 404 to form a shot peening hole 405. With this arrangement, after the test piece is shot peened, it is convenient to remove the test piece to check the coverage of the shot peening area of ​​the test piece.

[0068] Furthermore, in step S300, the shot peening hole 405 is a square hole, and the width of the shot peening hole 405 is the same as the diameter of the small hole of the turbine disk 800.

[0069] In this embodiment, when the width of the shot peening hole 405 is the same as the diameter of the small hole of the turbine disk 800, the shot peening situation of the shot peening hole 405 can be used as a simulation of the small hole of the turbine disk 800. Then, the shot peening saturation curve can be easily drawn using the N-type test piece 300 to obtain the equipment shot peening parameters of the rotating spear gun 101 with a shot peening intensity in the range of R~HmmN, i.e., the C group equipment parameters.

[0070] Reference Figures 6-7 In step S500, the turbine disk shot peening positioning fixture includes a base plate 500, a cover plate 600, a positioning bolt 700, and a fixing nut 701. The positioning bolt 700 passes through the base plate 500, the turbine disk 800, and the cover plate 600 in sequence and is threadedly connected to the fixing nut 701 so that the turbine disk 800 is installed between the base plate 500 and the cover plate 600. The head of the positioning bolt 700 mates with the center positioning hole of the shot peening equipment worktable so that the turbine disk 800 shot peening positioning fixture is installed on the shot peening equipment worktable.

[0071] In this embodiment, the turbine disk shot peening positioning fixture is used to fix and position the turbine disk 800, so as to facilitate the rotation of the spear gun 101 to perform shot peening treatment on the small holes on the turbine disk 800. Specifically, the turbine disk 800 shot peening positioning fixture includes a base 500, a cover plate 600, a positioning bolt 700, and a fixing nut 701. The base 500 is a disc and is placed on the worktable of the shot peening equipment. The lower surface of the base 500 is in contact with the worktable of the shot peening equipment. The positioning bolt 700 is coaxially arranged with the base 500 and extends into the lower surface of the base 500. The head of the positioning bolt 700 is located on one side of the lower surface of the base 500 and is used to cooperate with the center positioning hole of the worktable of the shot peening equipment for positioning. The screw of the positioning bolt 700 passes through the base 500, the turbine disk 800, and the cover plate 600 in sequence and is threadedly connected to the fixing nut 701, so that the turbine disk 800 is installed between the base 500 and the cover plate 600. In practice, the head of the positioning bolt 700 is aligned with the center positioning hole of the shot peening equipment workbench. The base plate 500 is then fitted onto the positioning bolt 700, and the lower surface of the base plate 500 is made to fit against the shot peening equipment workbench. Then, the turbine disk 800 is fitted onto the positioning bolt 700 and placed on top of the base plate 500. Next, the cover plate 600 is placed on top of the turbine disk 800. Finally, the fixing threads are tightened to fix the turbine disk 800 between the base plate 500 and the cover plate 600.

[0072] Furthermore, in step S500, a positioning pin 504 is provided on the chassis 500. The positioning pin 504 cooperates with the shot peening equipment worktable to position the chassis 500 circumferentially relative to the shot peening equipment worktable and provide a positioning reference for the CNC shot peening program. In this embodiment, the positioning pin 504 can fix the position of the chassis 500 and use the positioning pin 504 as a reference point for the CNC shot peening program, so as to facilitate the rotation of the spear gun 101 to shot peen the turbine disk 800 fixed between the chassis 500 and the cover plate 600.

[0073] Furthermore, the shot peening material is cast steel shot. In this embodiment, cast steel shot of type ASH70 is used for shot peening.

[0074] According to another aspect of the present invention, a turbine disk shot peening positioning fixture is also provided for positioning and fixing a turbine disk 800, and for shot peening the small holes on the turbine disk 800 using the small hole shot peening method for the turbine disk 800 as described above, comprising:

[0075] A chassis 500 is provided with a mounting groove, and a positioning member 501 is provided in the mounting groove. The positioning member 501 is connected and fixed to the chassis 500 by screws 503, and the positioning member 501 is circumferentially positioned relative to the chassis 500. The end of the positioning member 501 opposite to the chassis 500 is provided with a positioning groove 502 for mounting the first end of the turbine disk 800. The groove wall of the positioning groove 502 is used to abut against the side wall of the first end of the turbine disk 800.

[0076] The cover plate 600 includes a pressing part 601 for abutting against the second end of the turbine disk 800 and a positioning part 602 for embedding into the central hole of the turbine disk 800.

[0077] The fixing assembly includes a positioning bolt 700 and a fixing nut 701. The positioning bolt 700 passes sequentially through the chassis 500, the positioning member 501, the turbine disk 800, and the cover plate 600 and is threadedly connected to the fixing nut 701, so that the chassis 500 and the cover plate 600 press the turbine disk 800 between them. The head of the positioning bolt 700 is used to mate with the center positioning hole of the shot peening equipment worktable, so that the chassis 500 is mounted on the shot peening equipment worktable.

[0078] In this embodiment, the positioning member 501 is used to abut against the side wall of the first end of the turbine disk 800, and the positioning part 602 of the cover plate 600 is used to cooperate with the center hole of the turbine disk 800. Under the action of the positioning member 501 and the positioning part 602, the turbine disk 800 is radially positioned. At the same time, the fixing nut 701 and the positioning bolt 700 of the fixing component are used to clamp the turbine disk 800 between the pressing part 601 of the cover plate 600 and the positioning member 501, thereby axially positioning the turbine disk 800. After the turbine disk 800 is installed and fixed, it is convenient to shot peening the small holes on the turbine disk 800. To install and position the positioning component 501, the positioning component 501 is fixedly connected to the chassis 500 by screws 503 so that the positioning component 501 is circumferentially positioned relative to the chassis 500; to install and position the positioning bolt 700, the positioning bolt 700 is fixedly connected to the chassis 500 by cylindrical pins so that the positioning bolt 700 is circumferentially positioned relative to the chassis 500. This arrangement facilitates the rotation of the fixing nut 701 on the positioning bolt 700.

[0079] Furthermore, the chassis 500 is provided with a positioning pin 504, which is used to cooperate with the shot peening equipment worktable to position the chassis 500 circumferentially relative to the shot peening equipment worktable and to provide a positioning reference for small hole shot peening.

[0080] In this embodiment, the positioning pin 504 can fix the position of the chassis 500 and use the positioning pin 504 as the reference point for the CNC shot peening program, so as to facilitate the rotation of the spear gun 101 to shot peening the turbine disk 800 fixed between the chassis 500 and the cover plate 600.

[0081] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A method for shot peening a turbine disk with small holes, characterized in that, Includes the following steps: Step S100: Select an unshielded Type A test piece (200), and perform shot peening on the Type A test piece (200) by adjusting the shot peening equipment parameters of the direct injection gun (100) to obtain the shot peening intensity of the Type A test piece (200) under different shot peening equipment parameters. Compare with the process parameter range of shot peening intensity of the small hole of the turbine disk (800), select the shot peening equipment parameters corresponding to the direct injection gun (100) when the shot peening intensity of the Type A test piece (200) is the same as the minimum value of the shot peening intensity of the small hole of the turbine disk (800), and define them as the first set of equipment parameters. Select the shot peening equipment parameters corresponding to the direct injection gun (100) when the shot peening intensity of the Type A test piece (200) is the same as the maximum value of the shot peening intensity of the small hole of the turbine disk (800), and define them as the second set of equipment parameters. Step S200: Select a partially shielded N-type test piece (300). After shielding, the N-type test piece (300) forms a long groove for simulating the small holes of the turbine disk (800). Use the direct spray gun (100) to perform shot peening on the long groove using the first set of equipment parameters, and obtain the shot peening intensity RmmN of the N-type test piece (300) at this time. Use the direct spray gun (100) to perform shot peening on the long groove using the second set of equipment parameters, and obtain the shot peening intensity HmmN of the direct spray gun (100) at this time. Step S300: Select an N-type test piece (300). The N-type test piece (300) is fixed on the worktable of the shot peening equipment by the test piece shot peening fixture (400). A shot peening hole (405) is formed between the N-type test piece (300) and the test piece shot peening fixture (400). The shot peening hole (405) is shot peened by the rotating spear gun (101). The shot peening equipment parameters corresponding to the rotating spear gun (101) when the shot peening intensity of the N-type test piece (300) is in the range of RmmN~HmmN are obtained and defined as the third set of equipment parameters. Step S400: Prepare a small hole specimen with the same structural size as the small hole of the turbine disk (800). After adjusting the rotating spear gun (101) to the third set of equipment parameters, shot peening the small hole of the small hole specimen. Obtain the moving speed Vt of the rotating spear gun (101) when the small hole shot peening coverage reaches 100% after t seconds. Set the moving speed V of the rotating spear gun (101) to ≤ 1 / 2Vt so that the small hole shot peening coverage is ≥ 200% to satisfy the requirement that the rotating spear gun (101) moves at speed V to complete the secondary coverage of the small hole shot peening. Step S500: The turbine disk (800) is installed on the worktable of the shot peening equipment using the turbine disk shot peening positioning fixture. The rotating spear gun (101) is moved into the small hole of the turbine disk (800) and shot peening is performed by calling the CNC shot peening program. At the same time, the rotating spear gun (101) is adjusted to the third set of equipment parameters and moving speed V for operation.

2. The orifice shot peening method for a turbine disk according to claim 1, characterized in that, In step S100, the process parameter range of the shot peening intensity of the small hole of the turbine disk (800) is 0.1mmA~0.15mmA. The shot peening equipment parameters corresponding to the direct spray gun (100) when the shot peening intensity of the A-type test piece (200) is 0.1mmA are selected and defined as the first set of equipment parameters. The shot peening equipment parameters corresponding to the direct spray gun (100) when the shot peening intensity of the A-type test piece (200) is 0.15mmA are selected and defined as the second set of equipment parameters.

3. The orifice shot peening method for a turbine disk according to claim 1, characterized in that, In step S200, two baffles are provided on the shot-peened surface of the N-type test piece (300). The two baffles are spaced apart along the width direction of the N-type test piece (300) and are joined with the N-type test piece (300) to form a long groove.

4. The orifice shot peening method for a turbine disk according to claim 1, characterized in that, In step S300, the test piece shot peening fixture (400) includes a base (401), a positioning shaft (402), and a test piece mounting plate (403). The base (401) is mounted on the worktable of the shot peening equipment via the positioning shaft (402). The test piece mounting plate (403) is fixed on the base (401) and has a strip groove (404) on it. An N-type test piece (300) is mounted on the test piece mounting plate (403) and covers the strip groove (404) to form a shot peening hole (405) for testing.

5. The orifice shot peening method for a turbine disk according to claim 4, characterized in that, In step S300, the shot peening hole (405) is a square hole, and the width of the shot peening hole (405) is the same as the diameter of the small hole of the turbine disk (800).

6. The orifice shot peening method for a turbine disk according to claim 1, characterized in that, The shot used for peening is cast steel shot.

7. A turbine disk shot peening positioning fixture for positioning and fixing a turbine disk (800), and for shot peening the small holes on the turbine disk (800) using the small hole shot peening method of any one of claims 1 to 6, characterized in that, include: A chassis (500) is provided with an installation groove. A positioning member (501) is provided in the installation groove. The positioning member (501) is connected and fixed to the chassis (500) by screws (503) and the positioning member (501) is circumferentially positioned relative to the chassis (500). A positioning groove (502) for mounting the first end of the turbine disk (800) is provided at one end of the positioning member (501) away from the chassis (500). The groove wall of the positioning groove (502) is used to abut against the side wall of the first end of the turbine disk (800). Cover plate (600), the cover plate (600) includes a pressing part (601) for abutting against the second end of the turbine disk (800) and a positioning part (602) for embedding into the central hole of the turbine disk (800); The fixing assembly includes a positioning bolt (700) and a fixing nut (701). The positioning bolt (700) passes sequentially through the chassis (500), the positioning member (501), the turbine disk (800), and the cover plate (600) and is threadedly connected to the fixing nut (701) so that the chassis (500) and the cover plate (600) press the turbine disk (800) between them. The head of the positioning bolt (700) is used to mate with the center positioning hole of the shot peening equipment worktable so that the chassis (500) is mounted on the shot peening equipment worktable.

8. The turbine disk shot peening positioning fixture according to claim 7, characterized in that, The chassis (500) is provided with a positioning pin (504), which is used to cooperate with the shot peening equipment worktable to position the chassis (500) circumferentially relative to the shot peening equipment worktable and to provide a positioning reference for the small hole shot peening of the turbine disk.

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