Machining method for aviation flywheel
By using a 5,000-ton press for pre-forging, gas-shielded welding wire full penetration welding and tempering treatment, combined with a coupling mechanism and a buffer mechanism, the deformation problem caused by welding residual stress in the machining of large flywheels was solved, and the precise assembly and efficient simulation test of the flywheel were realized.
Patent Information
- Application Number
- CN202511017651.6
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-07-23
- Publication Date
- 2025-10-28
AI Technical Summary
During the machining of large flywheels, residual welding stress is difficult to eliminate, leading to deformation and dimensional instability, which affects the flywheel's form and position tolerances and assembly accuracy, and consequently affects the reliability and accuracy of simulation tests of aircraft landing gear.
The drum wheel rim is prepared by pre-forging with a 5000-ton press and rolling with a 9-meter ring forging machine. Combined with full penetration welding with gas shielded welding wire and tempering treatment, residual welding stress is eliminated. The coaxiality of the rotating shaft and the connecting shaft and the accuracy of the dynamic balance test are ensured by the coupling mechanism and the buffer mechanism.
It effectively eliminated residual welding stress, stabilized the dimensional accuracy of the flywheel, ensured the concentricity and assembly accuracy of the flywheel and other components, and improved the reliability and accuracy of the simulation test of the aircraft take-off and landing device.
Smart Images
Figure CN120839429A_ABST
Abstract
Description
Technical Field
[0001] This application relates to the field of aerospace manufacturing technology, and in particular to a method for processing an aircraft flywheel. Background Technology
[0002] Currently, in ground simulation tests of aircraft landing gear, the flywheel, as a key component of the core test equipment, is mainly used to simulate the dynamic load of aircraft takeoff and landing to verify the performance of components such as landing gear. In recent years, with the increase in aircraft load, the flywheel diameter has exceeded 5 meters, and the industry now generally adopts the processing technology of forging-machining-assembly.
[0003] However, during the machining of large flywheels, due to their large size and complex structure, the residual stress generated during welding is difficult to eliminate effectively through conventional means. In subsequent machining processes such as cutting and grinding, these residual stresses can cause deformation such as twisting and warping of the flywheel due to uneven stress release, which seriously affects the form and position tolerances of the flywheel. At the same time, when the deformed flywheel is assembled with other precision components, it will cause problems such as misalignment of fitting clearances and inaccuracy of concentricity. This not only reduces assembly efficiency but also significantly affects the accuracy of the flywheel in simulating the dynamic loads of aircraft takeoff and landing. Ultimately, it interferes with the performance verification results of key components such as landing gear, wheels, and braking systems, thus restricting the reliability and accuracy of ground simulation tests of aircraft takeoff and landing devices.
[0004] In response to the aforementioned technologies, a method for processing aerospace flywheels is proposed. Summary of the Invention
[0005] The purpose of this application is to provide a method for machining an aircraft flywheel.
[0006] Firstly, the processing method for an aircraft flywheel provided in this application adopts the following technical solution: A method for manufacturing an aircraft flywheel includes the following steps: S1. The drum wheel rim is prepared by pre-forging with a 5000-ton press and rolling with a 9-meter ring forging machine; the rim and hub are pre-machined. After the S2 and 9-meter pit-type electric furnace is preheated to 250±10℃, full penetration welding is carried out using gas shielded welding wire. After welding, the temperature is maintained and slowly cooled. Each weld is tested by UT and MT. Then, the temperature is increased to 500℃ at ≤50℃ / h and tempered for 8 hours. The temperature is then reduced to below 250℃ in the furnace before being taken out of the furnace. S3. Rough machining removes excess parts of the drum assembly, fine machining improves the coaxiality of the shaft hole, knurling the outer diameter, then heats the drum to 250℃ at 50℃ / h, and measures the shaft hole diameter to be 450+0.6mm or more. After ensuring that the perpendicularity deviation between the shaft and the hole is <0.01°, heat fits the drum and allows it to cool naturally. S4. Perform sandblasting for rust removal and corrosion prevention, then spray epoxy zinc-rich primer, epoxy micaceous iron oxide intermediate layer, and polyurethane topcoat. Use a dynamic balancing tester for low-speed and high-speed testing, and correct through milling and drilling to ensure that the imbalance is no more than 560g. S5. Design the shipping platform to fix the flywheel with the transmission end facing upwards, tighten the bolts, apply anti-rust oil to the drum shaft and unpainted surfaces, wrap with cling film and plastic film, and provide secondary protection with plastic bags, tarpaulins and nylon netting after loading.
[0007] Secondly, the processing equipment for aircraft flywheels provided in this application adopts the following technical solution: A processing device for aircraft flywheels includes a dynamic balancing testing machine, and further includes: a rotating shaft, the rotating shaft being fixedly connected to the output shaft of the dynamic balancing testing machine; a connecting shaft, the connecting shaft being disposed on the outer wall of the rotating shaft via a coupling mechanism, and a drum housing being fixedly connected to the outer wall of the connecting shaft; and a buffer mechanism, the buffer mechanism being disposed on the bottom outer wall of the dynamic balancing testing machine. The coupling mechanism includes a connecting block, and a trapezoidal block is slidably connected to the inner wall of the connecting block; the buffer mechanism includes a base, and a round rod is fixedly connected to the inner wall of the base.
[0008] Preferably, the trapezoidal block is elastically connected to the inner wall of the connecting block by a reset spring, a slide rod is fixedly connected to the outer wall of the trapezoidal block, a protrusion is fixedly connected to the outer wall of the slide rod, a partition is fixedly connected to the outer wall of both the rotating shaft and the connecting shaft, an inclined groove is provided on the outer wall of the partition, and a pressing block is fixedly connected to the outer wall of both the rotating shaft and the connecting shaft.
[0009] Preferably, one end of the return spring is fixedly connected to the inner wall of the connecting block, and the other end of the return spring is fixedly connected to the outer wall of the trapezoidal block.
[0010] Preferably, the trapezoidal block contacts the outer wall of the pressing block, and the protrusion engages with the inclined groove.
[0011] Preferably, the outer walls of the rotating shaft and the connecting shaft are in contact with the inner wall of the connecting block. There are two sets of connecting blocks, and the two sets of connecting blocks are connected by fixing bolts. The outer wall of the fixing bolt is threaded with a fixing nut.
[0012] Preferably, a fixed cylinder is fixedly connected to the inner wall of the base, the inner wall of the fixed cylinder has a groove, a rubber pad is elastically connected to the inner wall of the fixed cylinder by a buffer spring, a moving rod is fixedly connected to the outer wall of the rubber pad, a rubber ring is fixedly connected to the outer wall of the round rod, a damping block is slidably connected to the outer wall of the round rod, and the damping block is hinged to the bottom outer wall of the dynamic balancing test machine by a hinge rod.
[0013] Preferably, the base is slidably connected to the bottom outer wall of the dynamic balancing testing machine, and the damping block is in contact with the outer wall of the rubber ring.
[0014] Preferably, one end of the buffer spring is fixedly connected to the inner wall of the fixed cylinder, the other end of the buffer spring is fixedly connected to the outer wall of the rubber pad, and the moving rod is slidably connected to the inner wall of the fixed cylinder.
[0015] Preferably, one end of the hinge rod is hinged to the outer wall of the damping block, the other end of the hinge rod is hinged to the bottom outer wall of the dynamic balancing testing machine, and the top outer wall of the moving rod is fixedly connected to the bottom outer wall of the dynamic balancing testing machine.
[0016] In summary, this application includes at least one of the following beneficial technical effects: 1. In the process of machining aerospace flywheels, this invention uses a temperature gun to monitor the temperature of the measuring point in real time during welding, and selects gas-shielded welding wire for full penetration welding. During tempering, the microstructure is homogenized, residual welding stress is eliminated, deformation and cracking are prevented in subsequent processing or use, and dimensional accuracy is stabilized to ensure the accuracy of subsequent processing. 2. The present invention, through the setting of the coupling mechanism, by installing two sets of connecting blocks on the rotating shaft and the connecting shaft, the pressing block will squeeze the trapezoidal block and drive the sliding rod and the protrusion to move to both sides. By engaging the protrusion with the inclined groove on the partition plate on both sides, the rotating shaft and the connecting shaft can be connected and fastened through the coupling mechanism, and it can be ensured that the two will not be offset due to rotation, thus ensuring the accuracy of the dynamic balance test. 3. By setting up a buffer mechanism, the present invention can provide a certain buffering effect through the moving rod and buffer spring when the dynamic balancing testing machine is started. The contact between the rubber pad and the groove, and the contact between the damping block and the rubber ring can play a damping role, reducing the vibration and rebound amplitude of the dynamic balancing testing machine and avoiding the influence of shaft offset caused by large vibration amplitude during the test. Attached Figure Description
[0017] Figure 1 This is a schematic diagram of the overall structure of Embodiment 2 of this application; Figure 2 This is an exploded structural diagram of the connecting shaft, connecting block, and rotating shaft according to Embodiment 2 of this application; Figure 3 This is a cross-sectional view of the connecting shaft and connecting block, and an exploded structural diagram of the rotating shaft according to Embodiment 2 of this application; Figure 4 This is a schematic cross-sectional view of the connecting block in Embodiment 2 of this application; Figure 5 This is a cross-sectional view of the base and an exploded structural diagram of the dynamic balancing testing machine according to Embodiment 2 of this application; Figure 6This is a cross-sectional view of the base and fixing cylinder according to Embodiment 2 of this application; Figure 7 This is a schematic diagram of the overall process of Embodiment 1 of this application.
[0018] Explanation of reference numerals in the attached drawings: 1. Dynamic balancing testing machine; 2. Coupling mechanism; 201. Connecting block; 202. Return spring; 203. Trapezoidal block; 204. Sliding rod; 205. Protrusion; 206. Partition plate; 207. Inclined groove; 208. Pressing block; 3. Buffer mechanism; 31. Base; 32. Fixed cylinder; 33. Buffer spring; 34. Moving rod; 35. Rubber pad; 36. Groove; 37. Round rod; 38. Damping block; 39. Rubber ring; 30. Hinge rod; 4. Drum shell; 5. Rotating shaft; 6. Connecting shaft; 7. Fixing bolt; 8. Fixing nut. Detailed Implementation
[0019] The following combination Figures 1-7 This application will be described in further detail below.
[0020] Example 1 A method for machining an aircraft flywheel, referring to... Figure 7 This includes the following steps: S1. The drum wheel rim is prepared by pre-forging with a 5000-ton press and rolling with a 9-meter ring forging machine; the rim and hub are pre-machined. After the S2 and 9-meter pit-type electric furnace is preheated to 250±10℃, full penetration welding is carried out using gas shielded welding wire. After welding, the temperature is maintained and slowly cooled. Each weld is tested by UT and MT. Then, the temperature is increased to 500℃ at ≤50℃ / h and tempered for 8 hours. The temperature is then reduced to below 250℃ in the furnace before being taken out of the furnace. S3. Rough machining removes excess parts of the drum assembly, fine machining improves the coaxiality of the shaft hole, knurling the outer diameter, then heats the drum to 250℃ at 50℃ / h, and measures the shaft hole diameter to be 450+0.6mm or more. After ensuring that the perpendicularity deviation between the shaft and the hole is <0.01°, heat fits the drum and allows it to cool naturally. S4. Sandblasting is carried out for rust removal and corrosion prevention. Then, epoxy zinc-rich primer, epoxy micaceous iron oxide intermediate layer and polyurethane topcoat are sprayed. Low-speed and high-speed tests are carried out using a dynamic balancing tester (1). Through milling and drilling correction, the unbalance amount is ensured to be no more than 560g. S5. Design the shipping platform to fix the flywheel with the transmission end facing upwards, tighten the bolts, apply anti-rust oil to the drum shaft and unpainted surfaces, wrap with cling film and plastic film, and provide secondary protection with plastic bags, tarpaulins and nylon netting after loading.
[0021] The above scheme is adopted as follows: a 5000-ton press is used for pre-forging. Based on the design dimensions of the drum rim and the material forging ratio requirements, the single pressing amount is controlled to ensure a reasonable distribution of metal flow lines. Then, the drum rim is prepared by rolling on a 9-meter ring forging machine. The rim and hub are pre-processed by rough turning on a CNC lathe and key dimensions are detected by a coordinate measuring machine to prepare for the subsequent welding process. During welding and heat treatment strengthening, a 9-meter pit-type electric furnace was used for preheating, uniformly heating the drum to 250±10℃. Temperature measurement points were evenly distributed on the surface of the drum, and the temperature was monitored in real time using a temperature gun to ensure preheating uniformity. Gas-shielded welding wire with a composition matching the base material was selected, and a multi-layer, multi-pass welding process was used for full penetration welding. After welding, the drum was kept at the furnace and slowly cooled to room temperature. Each weld underwent 100% UT and MT testing, strictly adhering to the GB3323-87 Class II standard, and using professional flaw detection equipment. The test blocks were used for calibration. During tempering, the drum assembly was brought into the furnace at room temperature and heated to 500±10℃ at a heating rate of ≤50℃ / h. It was then held at this temperature for 8 hours for stress relief annealing. After the stress relief annealing was completed, the assembly was cooled with the furnace at a cooling rate of 60±5℃ / h. The assembly was removed from the furnace when the temperature inside the furnace dropped to below 250℃. Tempering can homogenize the microstructure, eliminate residual welding stress, improve material properties, prevent deformation and cracking during subsequent processing or use, stabilize dimensional accuracy, and ensure the accuracy of subsequent machining and dynamic balancing.
[0022] In the roughing stage, a large gantry machining center is used to cut or turn the welded drum assembly, employing a layered cutting method to remove excess parts and provide a stable foundation for finish machining. During finish machining, a high-precision boring and milling machine is used for precision boring and milling. The drum shaft hole is reamed, and a laser interferometer is used to monitor the coaxiality of the drum shaft and the drum in real time, achieving an interference fit. A knurling cutter is used to knurl the outer surface of the drum, creating a grid-like pattern. During the heat fitting process, a large hydraulic positioning assembly is used. The drum shaft and drum are positioned, and the drum is heated to 250°C at a heating rate of 50°C / h using electric heating. The surface temperature of the drum assembly is measured in real time using an infrared thermometer. The inner diameter of the drum shaft hole is measured with vernier calipers to ensure it reaches 450 ± 0.6 mm or more. The perpendicularity of the drum shaft and the drum shaft hole is checked using a laser alignment instrument to ensure the deviation is less than 0.01°. The drum shaft is then vertically aligned with the drum shaft hole, and the drum shaft is slowly lowered into place using a hydraulic device for assembly. After assembly, the assembly is allowed to cool naturally to room temperature to prevent thermal stress concentration. During the anti-corrosion treatment, sandblasting equipment is used to remove rust, remove oxide scale, oil stains and burrs from the surface of the drum assembly. The coating is applied in the order of primer, intermediate coat and topcoat. The bottom layer is sprayed with epoxy zinc-rich primer, the middle layer is made of epoxy micaceous iron oxide material, and the top layer is made of polyurethane topcoat. After each layer is sprayed, it is left to air dry at room temperature for 24 hours.
[0023] The dynamic balancing test uses a high-precision dynamic balancing testing machine 1. First, a low-speed test is performed to initially detect the static imbalance and mark the direction of the imbalance. If the static imbalance exceeds the threshold, excess material is removed by CNC milling or drilling equipment. Then, the speed is gradually increased to the rated speed for high-speed testing. The vibration spectrum and phase angle are recorded. The magnitude and phase angle of the imbalance are calculated using professional software to ensure that the imbalance does not exceed 560g. A dedicated integrated shipping platform is designed, with a 10-15mm thick rubber buffer pad on the platform surface. The flywheel drive end is placed upwards, and the downward-facing test end plane and inner hole precisely align with the positioning pins and slots of the shipping platform to prevent deformation during transportation. High-strength bolts are used to secure the flywheel to the transport platform. All surfaces of the drum shaft are coated with hard film anti-rust oil and wrapped in multiple layers of cling film and plastic film. The unpainted surfaces of the drum are also coated with hard film anti-rust oil, and the outer circumference is wrapped with cling film and plastic film, then a protective layer of pearl cotton is added. After being loaded onto the truck, the entire structure is sealed in plastic bags, covered with tarpaulin for rain and sun protection, and finally secured with nylon netting to prevent displacement during transportation.
[0024] Example 2 A processing device for aircraft flywheels includes a dynamic balancing testing machine 1, and further includes: a rotating shaft 5, which is fixedly connected to the output shaft of the dynamic balancing testing machine 1; a connecting shaft 6, which is disposed on the outer wall of the rotating shaft 5 through a coupling mechanism 2, and a drum housing 4 is fixedly connected to the outer wall of the connecting shaft 6; and a buffer mechanism 3, which is disposed on the bottom outer wall of the dynamic balancing testing machine 1. The coupling mechanism 2 includes a connecting block 201, and a trapezoidal block 203 is slidably connected to the inner wall of the connecting block 201; the buffer mechanism 3 includes a base 31, and a round rod 37 is fixedly connected to the inner wall of the base 31.
[0025] The above scheme is adopted: the dynamic balancing test machine 1 is the main body of the equipment required for dynamic balancing testing, which is the existing technology. Its outer wall rotating shaft 5 can be connected to the connecting shaft 6 through the coupling mechanism 2. The connecting shaft 6 can be connected to the transmission shaft of the drum shell 4. The high-speed rotation of the output end of the dynamic balancing test machine 1 drives the drum shell 4 to rotate synchronously for testing. The coupling mechanism 2 can ensure that when the output shaft of the dynamic balancing test machine 1 rotates, the connecting shaft 6 always maintains coaxial rotation with the rotating shaft 5, improving the connection stability between the two, so as to avoid the vibration generated during the operation of the dynamic balancing test machine 1 from affecting the connection state between the two.
[0026] The trapezoidal block 203 is elastically connected to the inner wall of the connecting block 201 by a return spring 202. The outer wall of the trapezoidal block 203 is fixedly connected to a slide rod 204. The outer wall of the slide rod 204 is fixedly connected to a protrusion 205. The outer walls of the rotating shaft 5 and the connecting shaft 6 are both fixedly connected to a partition plate 206. The outer wall of the partition plate 206 is provided with a sloping groove 207. The outer walls of the rotating shaft 5 and the connecting shaft 6 are both fixedly connected to a pressing block 208.
[0027] The above-mentioned scheme is adopted: the connecting block 201 is provided with two sets, upper and lower. During installation, the two sets of connecting blocks 201 can fit against the outer walls of the connecting shaft 6 and the rotating shaft 5 from the top and bottom, and are engaged with the inclined groove 207 on the outer wall of the partition 206 by the protrusion 205, so that the connecting shaft 6 and the rotating shaft 5 remain coaxial and ensure the stability between them; each set of connecting blocks 201 is provided with two sets of trapezoidal blocks 203, a return spring 202, a slide rod 204, and a protrusion 205. Symmetrically distributed on both sides of the inner wall of the connecting block 201; two sets of pressing blocks 208 are symmetrically arranged on the outer walls of the connecting shaft 6 and the rotating shaft 5, and the pressing blocks 208 are also provided with inclined surfaces, and the inclined surfaces of the pressing blocks 208 and the trapezoidal blocks 203 are in a relative state; under normal conditions, the return spring 202 keeps the trapezoidal blocks 203 in a certain position due to its elastic force, the slide rod 204 is completely in the inner wall of the connecting block 201, and the protrusion 205 is in contact with the outer wall of the connecting block 201, such as Figure 3 As shown, at this time, the long side slope of trapezoidal block 203 corresponds to the long side slope of pressing block 208.
[0028] One end of the return spring 202 is fixedly connected to the inner wall of the connecting block 201, and the other end of the return spring 202 is fixedly connected to the outer wall of the trapezoidal block 203; the trapezoidal block 203 contacts the outer wall of the pressing block 208, and the protrusion 205 is engaged with the inclined groove 207; the outer walls of the rotating shaft 5 and the connecting shaft 6 are both in contact with the inner wall of the connecting block 201. Two sets of connecting blocks 201 are provided, and the two sets of connecting blocks 201 are connected by fixing bolts 7. The outer wall of the fixing bolts 7 is threaded with fixing nuts 8.
[0029] Using the above scheme: When installing the coupling mechanism 2, first rotate the rotating shaft 5 and the connecting shaft 6 until their pressing blocks 208 are in a straight line. Then align the trapezoidal blocks 203 of the two sets of connecting blocks 201 with the pressing blocks 208. Move the two sets of connecting blocks 201 towards the center simultaneously. The long side of the trapezoidal block 203 contacts the pressing block 208 first. Since the pressing block 208 is fixed, it will squeeze the trapezoidal block 203, causing it to move along the inclined surface of the pressing block 208. Since the trapezoidal block 203 can only move laterally within the inner wall of the connecting block 201, it will move to both sides of the connecting block 201, stretching the return spring 202 and driving the slide rod 2. 04 and protrusion 205 move to both sides; when protrusion 205 first moves, it contacts the inclined section of the inclined groove 207. During the process of the two sets of connecting blocks 201 moving and fitting together, protrusion 205 gradually moves outward to contact the straight section of the inclined groove 207 and gets stuck inside the inclined groove 207; after the two sets of connecting blocks 201 fit together, they can be fixed by fixing bolts 7 and fixing nuts 8 to complete the connection between the rotating shaft 5 and the connecting shaft 6. By the protrusion 205 being engaged with the inner wall of the inclined groove 207, it can be ensured that the connecting block 201 can always keep the rotating shaft 5 and the connecting shaft 6 coaxial and without deviation, so as not to affect the dynamic balance test results.
[0030] A fixed cylinder 32 is fixedly connected to the inner wall of the base 31. A groove 36 is provided on the inner wall of the fixed cylinder 32. A rubber pad 35 is elastically connected to the inner wall of the fixed cylinder 32 through a buffer spring 33. A moving rod 34 is fixedly connected to the outer wall of the rubber pad 35. A rubber ring 39 is fixedly connected to the outer wall of the round rod 37. A damping block 38 is slidably connected to the outer wall of the round rod 37. The damping block 38 is hinged to the bottom outer wall of the dynamic balancing test machine 1 through a hinge rod 30.
[0031] By adopting the above scheme: the buffer mechanism 3 can reduce the vibration generated during the operation of the dynamic balancing test machine 1, thereby further reducing the force of the offset caused by vibration between the rotating shaft 5 and the connecting shaft 6, and at the same time reducing some noise; the dynamic balancing test machine 1 is made in the base 31 by means of the fixed cylinder 32, the moving rod 34, the hinge rod 30, etc. When it vibrates during operation, it will move up and down inside the base 31. The buffer spring 33 can play a certain buffering effect, and the rubber pad 35 and the rubber ring 39 can provide a damping effect, reducing the amplitude of vibration and the rebound of the buffer spring 33, and ensuring the stability of the dynamic balancing test machine 1.
[0032] The base 31 is slidably connected to the outer wall of the bottom end of the dynamic balancing testing machine 1, and the damping block 38 is in contact with the outer wall of the rubber ring 39; one end of the buffer spring 33 is fixedly connected to the inner wall of the fixed cylinder 32, and the other end of the buffer spring 33 is fixedly connected to the outer wall of the rubber pad 35; the moving rod 34 is slidably connected to the inner wall of the fixed cylinder 32; one end of the hinge rod 30 is hinged to the outer wall of the damping block 38, and the other end of the hinge rod 30 is hinged to the outer wall of the bottom end of the dynamic balancing testing machine 1; the outer wall of the top end of the moving rod 34 is fixedly connected to the outer wall of the bottom end of the dynamic balancing testing machine 1.
[0033] The above scheme is adopted: When the dynamic balancing testing machine 1 moves up and down, the moving rod 34 will move in the inner wall of the fixed cylinder 32. The buffer spring 33 contracts and rebounds under the action of elastic force. The moving rod 34 drives the rubber pad 35 to continuously contact multiple sets of grooves 36. The grooves 36 squeeze the rubber pad 35 and cause it to deform, increasing the friction. During the vibration of the dynamic balancing testing machine 1, it will drive the hinge rod 30 to continuously rotate, causing the damping block 38 to continuously move on the outer wall of the rubber ring 39 on the outer wall of the round rod 37. Since the inner wall of the damping block 38 is also made of rubber, a large friction force is generated between the two, which further plays a damping role, reduces the amplitude of vibration, and provides a better buffering effect for the dynamic balancing testing machine 1.
[0034] Working principle and usage process of this invention: Connect and fasten the rotating shaft 5 to the output shaft of the dynamic balancing test machine 1 with a key. Connect the connecting shaft 6 to the drum housing 4. Rotate the rotating shaft 5 and the connecting shaft 6 so that the pressure blocks 208 on their outer walls are on the same straight line. Align the trapezoidal blocks 203 of the two sets of connecting blocks 201 with the pressure blocks 208 and push the connecting blocks 201 towards the middle so that the trapezoidal blocks 203 and the long side of the pressure blocks 208 are in direct contact. Under the pressure of the pressure blocks 208, the trapezoidal blocks 203 move to both sides of the connecting blocks 201, stretching the return spring 202 and driving the slide rod 204 and the protrusion 205 to move outward. During the process of the connecting blocks 201 fitting together, the protrusion 205 gradually gets stuck into the inclined groove 207 on the outer wall of the partition 206. Use the fixing bolts 7 and fixing nuts 8 to fix the two sets of connecting blocks 201 to ensure that the rotating shaft 5 and the connecting shaft 6 are coaxially connected. Start the dynamic balancing testing machine 1 to perform dynamic balancing tests. During the operation of the dynamic balancing testing machine 1, the vibration generated by the equipment causes it to move up and down within the base 31. The moving rod 34 slides on the inner wall of the fixed cylinder 32, compressing the buffer spring 33 and causing it to contract and rebound. The rubber pad 35 contacts the groove 36 on the inner wall of the fixed cylinder 32, causing deformation and increasing friction. At the same time, the vibration of the dynamic balancing testing machine 1 causes the hinge rod 30 to rotate, causing the damping block 38 to move on the rubber ring 39 on the outer wall of the round rod 37. The friction between the two is used to further attenuate the vibration, reducing the impact of equipment vibration on the testing accuracy and operating noise. The embodiments described in this specific implementation are preferred embodiments of this application and are not intended to limit the scope of protection of this application. Identical components are represented by the same reference numerals. Therefore, all equivalent changes made to the structure, shape, and principle of this application should be covered within the scope of protection of this application.
Claims
1. A method for machining an aircraft flywheel, characterized in that, Includes the following steps: S1. The drum wheel rim is prepared by pre-forging with a 5000-ton press and rolling with a 9-meter ring forging machine; the rim and hub are pre-machined. After the S2 and 9-meter pit-type electric furnace is preheated to 250±10℃, full penetration welding is carried out using gas shielded welding wire. After welding, the temperature is maintained and slowly cooled. Each weld is tested by UT and MT. Then, the temperature is increased to 500℃ at ≤50℃ / h and tempered for 8 hours. The temperature is then reduced to below 250℃ in the furnace before being taken out of the furnace. S3. Rough machining removes excess parts of the drum assembly, fine machining improves the coaxiality of the shaft hole, knurling the outer diameter, then heats the drum to 250℃ at 50℃ / h, and measures the shaft hole diameter to be 450+0.6mm or more. After ensuring that the perpendicularity deviation between the shaft and the hole is <0.01°, heat fits the drum and allows it to cool naturally. S4. Sandblasting is carried out for rust removal and corrosion prevention. Then, epoxy zinc-rich primer, epoxy micaceous iron oxide intermediate layer and polyurethane topcoat are sprayed. Low-speed and high-speed tests are carried out using a dynamic balancing tester (1). Through milling and drilling correction, the unbalance amount is ensured to be no more than 560g. S5. Design the shipping platform to fix the flywheel with the transmission end facing upwards, tighten the bolts, apply anti-rust oil to the drum shaft and unpainted surfaces, wrap with cling film and plastic film, and provide secondary protection with plastic bags, tarpaulins and nylon netting after loading.
2. A machining equipment for aircraft flywheels, applied to the machining method for aircraft flywheels as described in claim 1, comprising a dynamic balancing testing machine (1), characterized in that, Also includes: A rotating shaft (5) is fixedly connected to the output shaft of a dynamic balancing testing machine (1); A connecting shaft (6) is provided on the outer wall of the rotating shaft (5) through a coupling mechanism (2), and a drum housing (4) is fixedly connected to the outer wall of the connecting shaft (6). A buffer mechanism (3) is provided on the bottom outer wall of the dynamic balancing test machine (1); The connecting shaft mechanism (2) includes a connecting block (201), and a trapezoidal block (203) is slidably connected to the inner wall of the connecting block (201). The buffer mechanism (3) includes a base (31), and a round rod (37) is fixedly connected to the inner wall of the base (31).
3. The processing equipment for aircraft flywheels according to claim 2, characterized in that, The trapezoidal block (203) is elastically connected to the inner wall of the connecting block (201) by a return spring (202). A slide rod (204) is fixedly connected to the outer wall of the trapezoidal block (203). A protrusion (205) is fixedly connected to the outer wall of the slide rod (204). A partition plate (206) is fixedly connected to the outer wall of the rotating shaft (5) and the connecting shaft (6). An inclined groove (207) is opened on the outer wall of the partition plate (206). A pressing block (208) is fixedly connected to the outer wall of the rotating shaft (5) and the connecting shaft (6).
4. The processing equipment for aircraft flywheels according to claim 3, characterized in that, One end of the reset spring (202) is fixedly connected to the inner wall of the connecting block (201), and the other end of the reset spring (202) is fixedly connected to the outer wall of the trapezoidal block (203).
5. The processing equipment for aircraft flywheels according to claim 3, characterized in that, The trapezoidal block (203) contacts the outer wall of the pressing block (208), and the protrusion (205) engages with the inclined groove (207).
6. The processing equipment for aircraft flywheels according to claim 3, characterized in that, The outer walls of the rotating shaft (5) and the connecting shaft (6) are in contact with the inner wall of the connecting block (201). There are two sets of connecting blocks (201), and the two sets of connecting blocks (201) are connected by fixing bolts (7). The outer wall of the fixing bolts (7) is threaded with fixing nuts (8).
7. The processing equipment for aircraft flywheels according to claim 2, characterized in that, The inner wall of the base (31) is fixedly connected to a fixed cylinder (32), the inner wall of the fixed cylinder (32) is provided with a groove (36), the inner wall of the fixed cylinder (32) is elastically connected to a rubber pad (35) by a buffer spring (33), the outer wall of the rubber pad (35) is fixedly connected to a moving rod (34), the outer wall of the round rod (37) is fixedly connected to a rubber ring (39), the outer wall of the round rod (37) is slidably connected to a damping block (38), and the damping block (38) is hinged to the bottom outer wall of the dynamic balancing test machine (1) by a hinge rod (30).
8. The processing equipment for aircraft flywheels according to claim 7, characterized in that, The base (31) is slidably connected to the bottom outer wall of the dynamic balancing test machine (1), and the damping block (38) is in contact with the outer wall of the rubber ring (39).
9. The processing equipment for aircraft flywheels according to claim 7, characterized in that, One end of the buffer spring (33) is fixedly connected to the inner wall of the fixed cylinder (32), the other end of the buffer spring (33) is fixedly connected to the outer wall of the rubber pad (35), and the moving rod (34) is slidably connected to the inner wall of the fixed cylinder (32).
10. The processing equipment for aircraft flywheels according to claim 7, characterized in that, One end of the hinge rod (30) is hinged to the outer wall of the damping block (38), and the other end of the hinge rod (30) is hinged to the bottom outer wall of the dynamic balancing test machine (1). The top outer wall of the moving rod (34) is fixedly connected to the bottom outer wall of the dynamic balancing test machine (1).