Wheel integrity test method, test fixture and test device

Abstract

The present invention discloses a wheel integrity test method, a test tool and a test device, wherein the wheel integrity test method comprises the following contents: temperature calibration of the wheel test temperature; determining the wheel integrity test speed; setting a temperature control value according to the temperature calibration result, and when the wheel temperature reaches the test temperature, starting the test device to drive the wheel to rotate at a high speed to the test speed N test , and run stably at this speed for no less than 5 minutes. The present invention first calibrates the test temperature of the wheel disc, takes the wheel center test temperature as a reference, and sets the temperature control value according to the temperature calibration result during the formal test to ensure that the temperature of the wheel center and the outer surface of the wheel disc reaches the test temperature and meets the test requirements; at the same time, the wheel disc integrity test speed is determined, and the correction of the test speed by material properties, dimensional tolerances and the speed control accuracy of the test device is considered, so that the test load is close to the actual load of the wheel disc on the engine.

Description

Technical Field

[0001] The present invention relates to the technical field of civil turboshaft engines, and in particular to a wheel disc integrity test method, a test fixture and a test device. Background Art

[0002] Before obtaining airworthiness certification, civil turboshaft engines must complete a disc integrity test to verify the relevant provisions of Article 33.27 of the "Aircraft Engine Airworthiness Regulations" (CCAR-33R2) (turbine, compressor, fan and turbocharger rotors must have sufficient strength to ensure their structural integrity during use). The integrity test must take into account the correction of the test speed to the disc material properties, dimensional tolerances and the speed control accuracy of the tester, making the test speed very high, exceeding 60,000 r / min. It is very difficult and risky to ensure the smooth progress of the test at such a high test speed.

[0003] At present, there is no method specifically designed for the integrity test of civil turboshaft engine discs. Similar military aircraft disc over-rotation and cracking tests have a much lower speed than the integrity test speed of civil turboshaft engine discs. In terms of test operation, the test temperature is not calibrated, resulting in a certain difference between the temperature load during the test and the actual temperature load of the disc on the engine. Summary of the invention

[0004] The present invention provides a wheel integrity test method, test tooling and test device to solve the technical problem that the prior art does not perform temperature calibration and does not consider the correction of the speed due to material properties, dimensional tolerances, speed control accuracy of the test device, etc., resulting in a difference between the test load and the actual load.

[0005] According to one aspect of the present invention, a method for testing the integrity of a roulette wheel is provided, comprising the following contents:

[0006] Conduct temperature calibration for the wheel test temperature;

[0007] Determine the wheel integrity test speed, which is calculated by formula (1):

[0008] (1)

[0009] in, Indicates the test speed, Indicates the speed for airworthiness verification. Indicates the correction factor of material properties to the test speed, Indicates the correction factor of dimensional tolerance to test speed, Indicates the test device control accuracy correction speed;

[0010] Set the temperature control value according to the temperature calibration result. When the wheel temperature reaches the test temperature, start the test device to drive the wheel to rotate at high speed to the test speed N. test , and run stably at the test speed for no less than 5 minutes.

[0011] Furthermore, the temperature calibration of the wheel test temperature comprises the following steps:

[0012] S1: Obtain the roulette wheel center test point and its test temperature;

[0013] S2: Arrange a temperature measuring element T0 on the inner wall of the temperature calibration device, arrange a temperature measuring element T1 under the wheel, arrange a temperature measuring element T2 around the wheel center, and arrange a temperature measuring element T3 on the outer surface of the wheel;

[0014] S3: Set a temperature control value, heat until the temperature of T2 and T3 reaches the test temperature and is stable. If T2 and T3 do not reach the test temperature, cool down to room temperature, set a new temperature control value according to the previous temperature calibration result and perform another temperature calibration until T2 and T3 meet the test requirements and are stable. At this time, record the temperature values ​​of T0-T4;

[0015] S4: During the formal test, ensure that the positions of T0 and T1 remain unchanged, and set the temperature control value according to the final temperature calibration result.

[0016] Furthermore, the step S1 of obtaining the roulette wheel center test point and its test temperature includes the following contents:

[0017] An ANSYS finite element model of the wheel is established and meshed. The wheel centrifugal load, blade centrifugal load, temperature load and axial preload are applied to the finite element model to obtain the strain distribution of the wheel. The point with maximum strain is the assessment point of the wheel center, and the corresponding temperature load is the assessment temperature.

[0018] Furthermore, the Calculated by formula (2):

[0019] (2)

[0020] Among them, the R m实测 It represents the actual measured value of the ultimate tensile strength at the test temperature, R m最低 Indicates the minimum ultimate tensile strength specified in the drawing at the test temperature.

[0021] Furthermore, the Calculated by formula (3):

[0022] (3)

[0023] Among them, the Nmax represents the calculated rupture speed corresponding to the best model of the roulette wheel, N min It represents the calculated rupture speed corresponding to the worst model of the roulette wheel.

[0024] According to a second aspect of the present invention, a roulette integrity test tool is also provided, which is used for performing a roulette integrity test in the roulette integrity test method, and comprises a roulette, an adapter, a connecting shaft, a pressure block and a center pull rod, wherein the connecting shaft and the pressure block are both transmission-connected to the roulette and are respectively arranged at both ends of the roulette, the center pull rod passes through the roulette, and the first end of the center pull rod is connected to the connecting shaft, and the second end of the center pull rod passes through the pressure block, the center pull rod is used to apply a pre-tightening force to the entire tool and is tightened by a clamping nut, the clamping nut is arranged on the outside of the pressure block of the center pull rod, and the adapter is connected to the connecting shaft by a fastening screw.

[0025] According to a third aspect of the present invention, a preload force verification method is further provided, wherein the preload force verification is performed using the wheel integrity test fixture, and the preload force verification method comprises the following contents:

[0026] 1) Calculate and analyze the center tie rod in the wheel integrity test fixture to obtain the preload force of the center tie rod, and calculate the elongation of the center tie rod after the preload force is applied;

[0027] 2) The length of the entire tooling is measured before the preload is applied as L1, and the length of the entire tooling is measured after the preload is applied as L2. The elongation ΔL of the center tie rod after the preload is applied is obtained by formula (4);

[0028] ΔL=L2-L1(4)

[0029] 3) Compare the center tie rod elongation ΔL obtained in step 2) with the center tie rod elongation after the preload force is applied calculated in step 1) to determine whether the preload force is applied in place.

[0030] According to a fourth aspect of the present invention, there is also provided a roulette integrity testing device, comprising a test chamber, a heating furnace and a temperature collecting device, wherein the heating furnace is arranged inside the test chamber, a heating element is arranged on the side wall of the heating furnace, the roulette integrity testing tool is arranged inside the heating furnace, and the temperature collecting device is used to collect the temperature of the roulette in the heating furnace and / or the roulette integrity testing tool.

[0031] Furthermore, the temperature acquisition device includes a temperature acquisition system, and a temperature measuring element T0 arranged on the inner wall of the heating furnace, a temperature measuring element T1 arranged under the wheel, a temperature measuring element T2 arranged circumferentially at the center of the wheel, and a temperature measuring element T3 arranged on the outer surface of the wheel. The temperature measuring element T0, the temperature measuring element T1, the temperature measuring element T2 and the temperature measuring element T3 are all electrically connected to the temperature acquisition system.

[0032] Furthermore, the roulette integrity test device also includes a control system and a vibration displacement sensor. The vibration displacement sensor is arranged outside the test chamber to collect vibration data when the roulette wheel rotates at high speed and transmit the vibration data to the control system. The temperature collection device is used to transmit the temperature data in the heating furnace to the control system. The control system is used to monitor the roulette integrity test according to the vibration data and temperature data.

[0033] The present invention has the following beneficial effects:

[0034] (1) In the disk integrity test method of the present invention, the test temperature of the disk is first calibrated, and the test temperature of the disk center is used as a reference. During the formal test, the temperature control value is set according to the temperature calibration result to ensure that the temperature of the disk center and the outer surface of the disk reaches the test temperature, so that the test temperature is consistent with the actual temperature load to meet the test requirements; at the same time, the disk integrity test speed is determined, and the speed at which the disk rupture margin is the lowest is verified in combination with the relevant provisions of Article 33.27 of the Aircraft Engine Airworthiness Regulations (CCAR-33R2), and the test speed is corrected by considering the material properties, dimensional tolerances and the speed control accuracy of the test device, so that the test load is close to the actual load of the disk on the engine. At the same time, the disk integrity test meets the relevant provisions of Article 33.27 of the Aircraft Engine Airworthiness Regulations (CCAR-33R2) that the turbine, compressor, fan and turbocharger rotors must have sufficient strength to ensure their structural integrity during use, laying a solid foundation for airworthiness certification.

[0035] (2) The present invention has been verified by experiments. The technical solution of the present invention was used to complete the integrity test of a civil turboshaft engine impeller. The test speed exceeded 60,000 r / min. The impeller ran stably for a specified time at the integrity test speed and successfully passed the integrity test assessment, meeting the requirements of the airworthiness regulations for aircraft engines.

[0036] In addition to the above-described objects, features and advantages, the present invention has other objects, features and advantages. The present invention is further described in detail below. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] The drawings constituting a part of this application are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the drawings:

[0038] Figure 1 This is the ANSYS finite element model of the roulette wheel;

[0039] Figure 2 is the temperature field distribution of the wheel;

[0040] Figure 3 This is a schematic diagram of the roulette wheel center test point;

[0041] Figure 4 This is a schematic diagram of the wheel integrity test fixture assembly;

[0042] Figure 5 This is a schematic diagram of temperature calibration of the wheel integrity test device;

[0043] Figure 6 This is the formal test schematic diagram of the wheel integrity test device.

[0044] Among them: 1. Adapter; 2. Connecting shaft; 3. Pressure block; 4. Pressing nut; 5. Center pull rod; 6. Fastening screw; 7. First threaded hole; 8. Second threaded hole; 9. Wheel; 10. End tooth structure; 11. Test chamber; 12. Heating furnace; 13. Temperature acquisition system; 14. Bracket; 15. Heating furnace wire; 16. Connecting rod; 17. Control system; 18. Vibration displacement sensor. DETAILED DESCRIPTION

[0045] The embodiments of the present invention are 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.

[0046] The embodiment of the first aspect of the present invention provides a roulette integrity test method, comprising the following contents:

[0047] Conduct temperature calibration for the wheel test temperature;

[0048] Determine the wheel integrity test speed, which is calculated by formula (1):

[0049] (1)

[0050] in, Indicates the test speed, Indicates the speed for airworthiness verification. Indicates the correction factor of material properties to the test speed, Indicates the correction factor of dimensional tolerance to test speed, Indicates the test device control accuracy correction speed;

[0051] Set the temperature control value according to the temperature calibration result. When the wheel temperature reaches the test temperature, start the test device to drive the wheel to rotate at high speed to the test speed N. test , and run stably at the test speed for no less than 5 minutes.

[0052] Before obtaining airworthiness certification for civil turboshaft engines, a disc integrity test must be completed to verify the relevant provisions of Article 33.27 of the Aircraft Engine Airworthiness Regulations (CCAR-33R2). The disc integrity test speed needs to take into account the correction of material properties, dimensional tolerances, and the speed control accuracy of the tester. Determined by formula (1), where Indicates the airworthiness clause verifies the rotation speed, further, To verify the speed corresponding to Article 33.27 of CCAR-33R2 of the Aircraft Engine Airworthiness Regulations, it is usually necessary to analyze the speed limit values ​​under various engine states and select the article with the smallest disc safety reserve coefficient. Specifically, according to the engine limit value requirements, the disc rupture speed calculation and analysis is carried out for each article corresponding to the speed, and the speed corresponding to the article with the lowest disc rupture margin is taken for verification. Calculated based on the control accuracy of the test device. For example, if the control accuracy of the test device is 0.05%FS and the maximum speed of the test device is 63000r / min, then N f =0.05%×63000 r / min =31.5 r / min.

[0053] Before the formal test, according to the assessment requirements, the temperature of the wheel center is controlled by the temperature calibration method. In order to ensure that the temperature of the wheel test point meets the assessment requirements and that the set temperature during the formal test is the test temperature, temperature calibration is carried out. During the formal test, the temperature control value is set according to the temperature calibration result. When the wheel temperature reaches the assessment temperature, the test device is started to drive the wheel to rotate at high speed to the test speed N test , and runs stably at this speed for no less than 5 minutes, the test is successfully completed.

[0054] In the wheel integrity test method of the present invention, the test temperature of the wheel is first calibrated, and the assessment temperature of the wheel center is used as a reference. During the formal test, the temperature control value is set according to the temperature calibration result to ensure that the temperature of the wheel center and the outer surface of the wheel reaches the assessment temperature, so that the test temperature is consistent with the actual temperature load to meet the assessment requirements; at the same time, the wheel integrity test speed is determined, and combined with the relevant provisions of Article 33.27 of the "Aircraft Engine Airworthiness Regulations" (CCAR-33R2), the speed when the wheel rupture margin is the lowest is verified, and the test speed is corrected by considering material properties, dimensional tolerances and the speed control accuracy of the test device, so that the test load is close to the actual load of the wheel on the engine. At the same time, the wheel integrity test meets the relevant provisions of Article 33.27 of the "Aircraft Engine Airworthiness Regulations" (CCAR-33R2) that the turbine, compressor, fan and turbocharger rotors must have sufficient strength to ensure their structural integrity during use, laying a solid foundation for airworthiness certification.

[0055] In this embodiment, the temperature calibration of the wheel test temperature includes the following steps:

[0056] S1: Obtain the roulette wheel center test point and its test temperature;

[0057] S2: Arrange a temperature measuring element T0 on the inner wall of the temperature calibration device, arrange a temperature measuring element T1 under the wheel, arrange a temperature measuring element T2 around the wheel center, and arrange a temperature measuring element T3 on the outer surface of the wheel;

[0058] S3: Set a temperature control value, heat until the temperature of T2 and T3 reaches the test temperature and is stable. If T2 and T3 do not reach the test temperature, cool down to room temperature, set a new temperature control value according to the previous temperature calibration result and perform another temperature calibration until T2 and T3 meet the test requirements and are stable. At this time, record the temperature values ​​of T0-T4;

[0059] S4: During the formal test, ensure that the positions of T0 and T1 remain unchanged, and set the temperature control value according to the final temperature calibration result.

[0060] The method for obtaining the wheel center test point and its test temperature in step S1 is as follows: first, establish the ANSYS finite element model of the wheel, and take the 1 / 34 cyclic symmetric section of the first-stage disk of the gas turbine as the calculation model. Use ten-node tetrahedron and twenty-node hexahedron units for meshing, and the finite element mesh is as follows: Figure 1 Constraints Figure 1 The axial displacement and circumferential displacement of surface A are shown, and cyclic symmetry constraints are applied on the two cutting surfaces. The centrifugal load of the wheel is applied in the form of rotational speed, the centrifugal load of the blade is applied in the form of surface pressure on the corresponding tenon and groove contact surface, and the temperature load is applied to the entire model in the form of node temperature. The temperature field distribution is shown in Figure 2 As shown, the axial preload is applied in the form of surface force. Figure 1 As shown in the B surface, the wheel center assessment points and their temperature loads are obtained based on the calculation results.

[0061] When the calculation results do not converge, the strain distribution of the wheel is obtained. The point with the maximum strain is the wheel center test point, and the corresponding temperature load is the test temperature. Figure 3 As shown, Figure 3 This is a schematic diagram of the roulette wheel center test point.

[0062] In step S2, a wheel of the same configuration is used, and temperature measuring elements T2 are evenly pasted / welded around the circumference of the wheel center, and temperature measuring elements T3 are pasted / welded on the outer surface of the wheel. In order to measure the temperature closest to the actual temperature, the temperature measuring element T1 is arranged below the wheel near the wheel position (not touching the wheel), and the temperature measuring element T0 is arranged on the inner wall of the heating furnace close to the furnace wire. At the same time, in order to avoid affecting the test temperature and thus the test results due to the movement of the positions of T0 and T1, the positions of T0 and T1 are no longer moved after the temperature is calibrated. At the same time, during the formal test, the positions of T0 and T1 are kept consistent with those during calibration.

[0063] The temperature measuring element is preferably a thermocouple, which directly measures the temperature and converts the temperature signal into an electrical signal and transmits it to the temperature acquisition system.

[0064] In step S3, the roulette calibration test piece is installed on the test bench according to the installation method during the formal test, and the roulette integrity test device of the present invention is used for temperature calibration, a temperature control value is set, and heating is turned on until T2 and T3 meet the test requirements, that is, the temperature reaches the roulette test temperature and is stable. In order to avoid temperature errors caused by not taking a cooling method due to T2 and T3 not reaching the roulette test temperature and directly continuing to heat up and ensure the consistency of the heating process during the formal test, in this process, if T2 and T3 do not reach the roulette test temperature (the reason may be that the temperature control value set last time is not high enough, resulting in T2 and T3 not reaching the roulette test temperature), then cool down to room temperature, reset the temperature control value according to the calibration result, and re-calibrate. This process may need to be repeated several times until T2 and T3 meet the test requirements, that is, the temperature reaches the roulette test temperature and is stable, and then record the T0-T4 values.

[0065] In this embodiment, the Calculated by formula (2):

[0066] (2)

[0067] in, It indicates the correction factor of the material properties of the wheel disc to the test speed. m实测It represents the actual measured value of the ultimate tensile strength at the test temperature, R m最低 Indicates the minimum ultimate tensile strength specified in the drawing at the test temperature.

[0068] In this embodiment, according to the dimensional tolerance of the disk and the blades, the most unfavorable and most favorable effects of the disk size and the blade size on the disk strength are considered, the worst model and the best model of the disk are established, and the rupture speed calculation and analysis of the worst model and the best model are performed respectively to obtain the minimum rupture speed N of the disk. min and maximum rupture speed N max .use Indicates the correction factor of dimensional tolerance to test speed, Calculated by formula (3):

[0069] (3)

[0070] Among them, the N max represents the calculated rupture speed corresponding to the best model of the roulette wheel, N min It represents the calculated rupture speed corresponding to the worst model of the roulette wheel.

[0071] An embodiment of the second aspect of the present invention provides a roulette integrity test tool, which is used to perform a roulette integrity test in the roulette integrity test method, and includes a roulette 9, an adapter 1, a connecting shaft 2, a pressure block 3 and a center pull rod 5, wherein the connecting shaft 2 and the pressure block 3 are both transmission-connected to the roulette 9 and are respectively arranged at both ends of the roulette 9, the center pull rod 5 passes through the roulette 9, and the first end of the center pull rod 5 is connected to the connecting shaft 2, and the second end of the center pull rod 5 passes through the pressure block 3, the center pull rod 5 is used to apply a pre-tightening force to the entire tool, and is tightened by a clamping nut 4, the clamping nut 4 is arranged on the outside of the pressure block 3 of the center pull rod 5, and the adapter 1 is connected to the connecting shaft 2 by a fastening screw 6.

[0072] The present invention designs a set of test fixtures to simulate the connection mode of the wheel disc 9 with adjacent parts on the engine, adopts the structure of the center tie rod 5, obtains the preload force of the center tie rod 5 through calculation and analysis, applies the preload force on a special press, and at the same time, measures the difference in fixture height before and after the preload force is applied, obtains the elongation of the center tie rod 5, and compares and analyzes it with the calculated elongation to verify that the preload force is applied in place, ensuring that the test will not fail due to insufficient preload force.

[0073] like Figure 4As shown, the end faces of the connecting shaft 2 and the pressing block 3 in the test fixture are designed with an end tooth structure 10 connected to the wheel disc 9 for centering and torque transmission. The center pull rod 5 passes through the wheel disc 9, and the first end of the center pull rod 5 is connected to the connecting shaft 2 and partially extends into the connecting shaft 2. The second end of the center pull rod 5 passes through the pressing block 3. The entire fixture is tightened by the clamping nut 4 after the pre-tightening force is applied by the center pull rod 5. A plurality of first threaded holes 7 and second threaded holes 8 are respectively designed on the connecting shaft 2 and the pressing block 3. The first threaded holes 7 and the second threaded holes 8 are both M6 threaded holes. Preferably, the first threaded holes 7 and the second threaded holes 8 are respectively set to 12, and are respectively evenly distributed on the connecting shaft 2 and the pressing block 3. The first threaded holes 7 and the second threaded holes 8 are used to apply counterweights during low-speed dynamic balancing to ensure that the dynamic balancing accuracy of the entire rotor system meets the requirements. The adapter 1 is a universal adapter 1, which is used to connect with the tester and drive the wheel disc to rotate through the tester. The adapter 1 and the connecting shaft 2 are fastened by a plurality of fastening screws 6 . The number of the fastening screws 6 is preferably 6, and the fastening screws 6 are evenly distributed on the adapter 1 in the circumferential direction.

[0074] The embodiment of the third aspect of the present invention provides a preload force verification method, which uses the wheel integrity test fixture to perform preload force verification, and the preload force verification method includes the following contents:

[0075] 1) Calculate and analyze the center tie rod 5 in the wheel integrity test fixture to obtain the preload force of the center tie rod 5, and calculate the elongation of the center tie rod 5 after the preload force is applied;

[0076] 2) The length of the entire tooling is measured before the preload is applied as L1, and the length of the entire tooling is measured after the preload is applied as L2. The elongation ΔL of the center tie rod 5 after the preload is applied is obtained by formula (4);

[0077] ΔL=L2-L1(4)

[0078] 3) Compare the elongation ΔL of the center tie rod 5 obtained in step 2) with the elongation of the center tie rod 5 after the preload force is applied calculated in step 1) to determine whether the preload force is applied in place.

[0079] The present invention measures the length of the entire tooling before and after applying the preload, and obtains the elongation of the center tie rod 5 after the preload is applied, thereby comparing it with the calculated elongation of the center tie rod 5 after the preload is applied to determine whether the preload is applied in place. The calculation method of the preload of the center tie rod 5 and the elongation of the center tie rod 5 after the preload is applied can be carried out using conventional methods. In order to ensure that the connecting surfaces do not loosen when the rotor is working, the applied preload must be greater than the maximum relaxation force that occurs when the rotor is working. When the elongation ΔL of the center tie rod 5 is equal to the calculated elongation of the center tie rod 5 after the preload is applied, it is considered that the preload is applied in place. The present invention ensures that the preload is applied in place by measuring the elongation of the center tie rod 5, thereby ensuring that the wheel integrity test will not fail due to insufficient preload.

[0080] An embodiment of the fourth aspect of the present invention provides a roulette integrity test device, comprising a test chamber 11, a heating furnace 12 and a temperature collection device, wherein the heating furnace 12 is arranged inside the test chamber 11, and a heating element is arranged on the side wall of the heating furnace 12, and the roulette integrity test tooling is arranged inside the heating furnace 12, and the temperature collection device is used to collect the temperature of the roulette 9 in the heating furnace 12 and / or the roulette integrity test tooling.

[0081] like Figure 5 As shown, the side wall of the heating furnace 12 is provided with a heat-insulating material, and a heating element is provided on the side wall of the heating furnace 12, and the heating element is used to provide a heat source for the inside of the heating furnace 12. Preferably, the heating element is provided on the left and right side walls of the heating furnace 12. The heating element is preferably a heating wire 15. A bracket 14 is provided outside the heating furnace 12, and the heating furnace 12 is arranged in the bracket 14, and the bracket 14 is connected to the connecting rod 16 at the top of the test chamber 11, so as to suspend the heating furnace 12 inside the test chamber 11. There is a gap between the heating furnace 12 and the inner wall of the test chamber 11. The wheel integrity test fixture is arranged inside the heating furnace 12 through the adapter 1, and the wheel integrity test is carried out under the drive of the test device. The temperature acquisition device is used to collect the temperature of the heating furnace 12 and the wheel disc 9, and is used to perform temperature calibration according to the temperature of the heating furnace 12 and the wheel disc 9.

[0082] In this embodiment, if Figure 5 As shown, the temperature acquisition device includes a temperature acquisition system 13, and a temperature measuring element T0 arranged on the inner wall of the heating furnace 12, a temperature measuring element T1 arranged under the wheel disc 9, a temperature measuring element T2 arranged circumferentially at the center of the wheel disc 9, and a temperature measuring element T3 arranged on the outer surface of the wheel disc 9. The temperature measuring element T0, the temperature measuring element T1, the temperature measuring element T2 and the temperature measuring element T3 are all electrically connected to the temperature acquisition system 13.

[0083] The temperature measuring element T0, the temperature measuring element T1, the temperature measuring element T2 and the temperature measuring element T3 are all thermocouples, wherein the temperature measuring element T0 is used to measure the temperature near the heating furnace wire 15, the temperature measuring element T1 is used to measure the temperature of the position below the wheel disc 9, close to the wheel disc 9 but not in contact with the wheel disc 9, the temperature measuring element T2 is used to measure the temperature of the wheel core of the wheel disc 9, and the temperature measuring element T2 is provided in a plurality of pieces, and the plurality of the temperature measuring elements T2 are evenly distributed in the wheel core of the wheel disc 9 in the circumferential direction, and the temperature measuring element T3 is used to measure the temperature of the outer surface of the wheel disc 9. During the temperature calibration process, the temperature measuring element T0, the temperature measuring element T1, the temperature measuring element T2 and the temperature measuring element T3 convert the collected temperature signal into an electrical signal and transmit it to the temperature acquisition system 13 for temperature calibration. In order to avoid affecting the test temperature and thus the test results due to the position movement of T0 and T1, after the temperature calibration, the positions of T0 and T1 are no longer moved, and the positions of T0 and T1 are kept consistent with those during the calibration during the formal test.

[0084] In this embodiment, if Figure 6 As shown, the wheel integrity test device also includes a control system 17 and a vibration displacement sensor 18. The vibration displacement sensor 18 is arranged outside the test chamber 11 and is used to collect vibration data of the wheel 9 when it rotates at high speed and transmit the vibration data to the control system 17. The temperature collection device is used to transmit the temperature data in the heating furnace 12 to the control system 17. The control system 17 is used to monitor the wheel integrity test according to the vibration data and the temperature data.

[0085] During the formal test, the temperature acquisition device only collects temperature data at positions T0 and T1, and the positions of T0 and T1 remain unchanged. The temperature measuring elements T0 and T1 convert the temperature signal into an electrical signal and transmit it to the temperature acquisition system 13. Figure 6 The test device is installed on the test device, and the temperature control value is set according to the temperature calibration result. When the temperature reaches the test temperature, the test device is started to drive the wheel 9 to rotate at a high speed to the test speed N test , and the test is successfully completed if the machine runs stably at this speed for no less than 5 minutes. During the test, vibration data and test temperature are collected by the vibration displacement sensor 18 and the temperature acquisition device, and fed back to the control system 17 for display. The test personnel monitor the vibration data and test temperature and judge the test operation according to the changes in the vibration data and test temperature.

[0086] The present invention proposes a temperature calibration method for the integrity test of a civil turboshaft engine disc, a disc integrity test method, and a more reliable center tie rod preload scheme and preload force verification method, so that the test conditions are closer to the load borne by the disc on the engine, providing support for the airworthiness certification of civil turboshaft engines. The present invention has been verified by experiments, and the technical solution of the present invention has been used to complete the integrity test of a civil turboshaft engine disc. The test speed exceeds 60,000 r / min, and the disc runs stably for a specified time at the integrity test speed, successfully passing the integrity test assessment, and meeting the airworthiness requirements of aviation engines.

[0087] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A roulette integrity test method, characterized in that: Includes the following: Conduct temperature calibration for the wheel test temperature; Determine the wheel integrity test speed, which is calculated by formula (1): <h2 style=";text-align:left;direction:ltr">N<h2 style=";text-align:left;direction:ltr"> test <h2 style=";text-align:left;direction:ltr"> =N<h2 style=";text-align:left;direction:ltr"> demo <h2 style=";text-align:left;direction:ltr"> K1K2+N<h2 style=";text-align:left;direction:ltr"> f <h2 style=";text-align:left;direction:ltr"> (1) Among them, N test Indicates the test speed, N demo Indicates the speed for verifying airworthiness clauses, K1 indicates the correction factor of material properties for the test speed, K2 indicates the correction factor of dimensional tolerance for the test speed, N f Indicates the corrected speed of the test device control accuracy; Set the temperature control value according to the temperature calibration result. When the wheel temperature reaches the test temperature, start the test device to drive the wheel to rotate at high speed to the test speed N. test , and run stably at the test speed for no less than 5 minutes.

2. The roulette integrity test method according to claim 1, characterized in that: The temperature calibration of the wheel disc test temperature comprises the following steps: S1: Obtain the roulette wheel center test point and its test temperature; S2: Arrange a temperature measuring element T0 on the inner wall of the temperature calibration device, arrange a temperature measuring element T1 under the wheel, arrange a temperature measuring element T2 around the wheel center, and arrange a temperature measuring element T3 on the outer surface of the wheel; S3: Set a temperature control value, heat until the temperature of T2 and T3 reaches the test temperature and is stable. If T2 and T3 do not reach the test temperature, cool down to room temperature, set a new temperature control value according to the previous temperature calibration result and perform another temperature calibration until T2 and T3 meet the test requirements and are stable. At this time, record the temperature values ​​of T0-T4; S4: During the formal test, ensure that the positions of T0 and T1 remain unchanged, and set the temperature control value according to the temperature calibration results.

3. The roulette integrity test method according to claim 2, characterized in that: Step S1 of obtaining the roulette wheel center test point and its test temperature Includes the following: An ANSYS finite element model of the wheel is established and meshed. The wheel centrifugal load, blade centrifugal load, temperature load and axial preload are applied to the finite element model to obtain the strain distribution of the wheel. The point with maximum strain is the assessment point of the wheel center, and the corresponding temperature load is the assessment temperature.

4. The roulette integrity test method according to claim 1, characterized in that: The K1 is calculated by formula (2): Among them, the R m实测 It represents the actual measured value of the ultimate tensile strength at the test temperature, R m最低 Indicates the minimum ultimate tensile strength specified in the drawing at the test temperature.

5. The roulette integrity test method according to claim 1, characterized in that: The K2 is calculated by formula (3): Among them, the N max represents the calculated rupture speed corresponding to the best model of the roulette wheel, N min It represents the calculated rupture speed corresponding to the worst model of the roulette wheel.

6. A wheel integrity test device, characterized in that: A roulette integrity test method for use in any one of claims 1 to 5, wherein the roulette integrity test device comprises a test chamber (11), a heating furnace (12) and a temperature acquisition device, wherein the heating furnace (12) is arranged inside the test chamber (11), a heating element is arranged on the side wall of the heating furnace (12), a roulette integrity test tool is arranged inside the heating furnace (12), and the temperature acquisition device is used to acquire the temperature of the roulette (9) in the heating furnace (12) and / or the roulette integrity test tool.

7. The wheel integrity test device according to claim 6, characterized in that: The temperature acquisition device comprises a temperature acquisition system (13), and a temperature measuring element T0 arranged on the inner wall of the heating furnace (12), a temperature measuring element T1 arranged below the wheel disc (9), a temperature measuring element T2 arranged circumferentially at the center of the wheel disc (9), and a temperature measuring element T3 arranged on the outer surface of the wheel disc (9), wherein the temperature measuring element T0, the temperature measuring element T1, the temperature measuring element T2 and the temperature measuring element T3 are all connected to the temperature acquisition system (13) by telecommunication.

8. The wheel integrity test device according to claim 6, characterized in that: The wheel integrity test device further comprises a control system (17) and a vibration displacement sensor (18). The vibration displacement sensor (18) is arranged outside the test chamber (11) and is used to collect vibration data of the wheel (9) when it rotates at high speed and transmit the vibration data to the control system (17). The temperature collection device is used to transmit temperature data in the heating furnace (12) to the control system (17). The control system (17) is used to monitor the wheel integrity test according to the vibration data and the temperature data.

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