A tool and method for axially interference fitting a rotating air guide wheel with a low pressure turbine disk

Abstract

This invention discloses a fixture and method for axial interference fit installation of a rotating guide vane and a low-pressure turbine disk. The fixture includes a base, a support ring, a positioning ring, a first screw, a pressure ring, a pressure plate, an anti-rotation plate, a pin, a top pin, a first insert pin, a second insert pin, a second screw, a centering ring, an elastic retaining ring, a one-way thrust bearing, and a third screw. During interference fit installation, the low-pressure turbine disk is first fixed using the base, support ring, positioning ring, and anti-rotation plate. Then, the rotating guide vane is placed on the low-pressure turbine disk. Next, the first screw, pressure ring, pressure plate, and top pin complete the non-interference fit assembly between the rotating guide vane boss and the low-pressure turbine disk boss. The pressure ring then drives the rotating guide vane to rotate by an angle. When the through hole of the rotating guide vane boss aligns with the groove of the low-pressure turbine disk boss as observed through the top pin hole on the pressure ring, the pin is inserted to complete the interference fit assembly. This invention can complete the axial interference fit assembly of the rotating guide vane and the low-pressure turbine disk in one step, and the rotating guide vane is not easily deformed.

Description

Technical Field

[0001] This invention belongs to the field of aero-engine assembly technology, specifically relating to special tooling and assembly methods in the interference fit assembly process of a rotating guide vane and a low-pressure turbine disk. Background Technology

[0002] Aero-engines have strict controls on component weight and extremely high requirements for the machining precision of each component. To ensure structural reliability, most components are currently assembled using thin-walled cantilever parts with axial interference. Therefore, more technical research is needed on the assembly technology and assembly quality of thin-walled cantilever parts with axial interference constraints. The low-pressure turbine rotor of an aero-engine is assembled from components such as the low-pressure turbine disk, rotating guide vane, and low-pressure turbine shaft.

[0003] The rotating guide vane is a typical thin-walled component with a high elastic modulus and a high coefficient of friction. Its outer diameter is greater than 400 mm, its inner diameter is greater than 300 mm, and its minimum wall thickness is 2 mm.

[0004] The low-pressure turbine disk is a typical turbine disk structure with high rigidity. Because it operates under high temperature and high centrifugal force, it uses FGH4097 material. This material has extremely high tensile and endurance strength, as well as fatigue and creep resistance, high elastic modulus, and high resistance to deformation.

[0005] The axial interference fit between the low-pressure turbine disk and the rotating guide vane assembly surface is 0.1–0.2 mm, such as… Figure 2 As shown, during installation, the 12 rotating guide vane bosses need to be simultaneously and evenly installed on the 12 low-pressure turbine disk bosses of the low-pressure turbine disk. Figure 2 The 12 bosses with through holes (round holes) in the upper left corner are pressed into... Figure 2 The lower left side features 12 bosses with slots (U-shaped openings) at their bottom ends, with the surfaces of two bosses having an axial interference fit. After axial installation, the rotating guide vane needs to be rotated relative to the low-pressure turbine disk by an angle (approximately 2° based on assembly experience) to align the through holes of the 12 bosses on the rotating guide vane with the slots of the 12 bosses on the low-pressure turbine disk. Finally, the pins are installed by inserting them into both the holes and slots simultaneously to complete the assembly.

[0006] Because the rotary guide vane is a thin-walled component, it is prone to deformation during installation under high deformation resistance. Furthermore, it is extremely difficult to simultaneously and evenly install all 12 bosses into position during axial installation, making successful installation almost impossible on the first attempt. After axially installing the rotary guide vane, it is necessary to rotate it into position under strong rotational resistance (sliding friction generated by axial interference), while simultaneously ensuring that the through holes of the 12 bosses on the rotary guide vane and the slots of the 12 bosses on the low-pressure turbine disk are aligned. Multiple technical conditions must be met simultaneously, making the process very challenging. Summary of the Invention

[0007] The present invention aims to provide a tooling and method for axial interference fit installation of a rotating guide vane and a low-pressure turbine disk, which can efficiently control the quality of axial interference fit assembly, complete the axial interference fit assembly of the rotating guide vane and the low-pressure turbine disk in one go, ensure the uniformity of the boss assembly, and prevent the rotating guide vane from deforming, thus meeting the assembly technical requirements of the rotating guide vane and the low-pressure turbine disk.

[0008] To achieve the above objectives, the present invention adopts the following technical solution:

[0009] A tooling for axial interference fit of a rotating guide vane and a low-pressure turbine disk, comprising:

[0010] Base;

[0011] A support ring, which is an annular component, is coaxial with the base and can be detachably mounted on the upper surface of the base;

[0012] The positioning ring is a ring-shaped component. The positioning ring is coaxial with the base and can be detachably installed on the upper end face of the base and located inside the inner ring surface of the support ring.

[0013] A pressure plate, which is connected to the base via a first screw, is located above the positioning ring;

[0014] The pressure ring is located below the pressure plate. The pressure ring is an annular part with top pin holes. The number and distribution of the top pin holes are consistent with the number and distribution of the bosses of the rotating guide wheel.

[0015] An anti-rotation plate is disposed between the positioning ring and the pressure plate, and the anti-rotation plate is provided with at least one positioning pin hole and a pin;

[0016] A centering ring, which is an annular component, is located between the outer annular surface of the positioning ring and the inner annular surface of the pressure ring;

[0017] Top pin, which is fitted into the top pin hole of the pressure ring.

[0018] Furthermore, both the support ring and the positioning ring are connected to the upper surface of the base by hexagonal head screws and cylindrical pins.

[0019] Furthermore, a lifting eye screw is connected to the base.

[0020] Furthermore, the first screw is positioned on the pressure plate by an elastic retaining ring, and a one-way thrust bearing is also assembled between the first screw and the pressure plate.

[0021] As one solution:

[0022] The inner wall of the top pin hole contains an internal thread;

[0023] The top pin includes a first top pin and a second top pin, wherein a threaded hole is formed on one end face of the second top pin;

[0024] The pressure ring is provided with rotating bosses, and the number and distribution of rotating bosses are the same as the number and distribution of rotating guide wheel bosses. The top pin hole is opened on the rotating bosses.

[0025] As one option, the tooling for axial interference fitting of the rotating guide vane and the low-pressure turbine disk also includes:

[0026] The first pin has an outer diameter less than or equal to the diameter of the through hole on the rotating guide vane boss and the groove width on the low-pressure turbine disk boss.

[0027] The second pin has a smaller outer diameter than the first pin.

[0028] The second screw has an external thread that matches the threaded hole on the end face of the second top pin.

[0029] The third screw has an external thread that matches the internal thread on the inner wall of the top pin hole, and an operating rod is vertically connected to the third screw.

[0030] A method for axial interference fit installation of a rotating guide vane and a low-pressure turbine disk, employing the aforementioned tooling for axial interference fit installation of the rotating guide vane and the low-pressure turbine disk, and including the following steps:

[0031] Step 1: Install the low-pressure turbine disk onto the base, support the lower end of the low-pressure turbine disk with the support ring, and locate the center hole of the low-pressure turbine disk with the outer ring surface of the positioning ring.

[0032] Step 2: Place the anti-rotation plate on the upper end of the low-pressure turbine disk and the positioning ring at the same time. Fix the anti-rotation plate and the positioning ring with the connector. Fix the low-pressure turbine disk to the base with the positioning pin holes and pins on the anti-rotation plate. Then install the rotating guide wheel on the low-pressure turbine disk. During installation, ensure that one rotating guide wheel boss is paired with one low-pressure turbine disk boss and close to it. Measure the axial clearance value between the axial end face of the rotating guide wheel and the low-pressure turbine disk boss directly above each rotating guide wheel boss.

[0033] Step 3: Place the pressure ring on the rotating guide wheel and ensure that the top pin hole is aligned with the rotating guide wheel boss. Then place the pressure plate on the pressure ring. Next, pass the first screw through the pressure plate and screw it into the base.

[0034] Step 4: Apply pressure to the pins in all the pin holes on the pressure ring, causing the pins to push the rotating guide wheel towards the low-pressure turbine disk boss to deform (the lower end of the pin presses against the axial upper end face of the rotating guide wheel, that is, the axial end face directly above the rotating guide wheel boss and located on the outer side of the rotating guide wheel. There are two axial end faces corresponding to the rotating guide wheel boss, one closer to the rotating guide wheel is the inner axial end face, and the other farther from the rotating guide wheel boss is the outer axial end face. Under the force of the pins, including the outer axial end face of the rotating guide wheel...) The three parts, including the outer end face, the inner axial end face, and the rotating guide wheel boss, are all cantilevered with the center position of the rotating guide wheel as the origin. The outer axial end face and the inner axial end face of the rotating guide wheel deform towards the low-pressure turbine boss, while the rotating guide wheel boss deforms away from the low-pressure turbine boss. This continues until the axial clearance between the rotating guide wheel axial end face and the low-pressure turbine disk boss, which are directly above the low-pressure turbine disk boss, decreases and they tend to fit together. The axial interference between the rotating guide wheel boss and the low-pressure turbine disk boss also decreases.

[0035] Step 5: Measure the axial clearance between the axial end face of the rotating guide wheel directly above the low-pressure turbine disk boss and the low-pressure turbine disk boss. If it is less than the axial interference between the rotating guide wheel boss and the low-pressure turbine disk boss and is close to zero, continue to step 6. If it does not meet the requirements, adjust the top pin in the corresponding position of the top pin hole on the pressure ring until the axial clearance requirement is met.

[0036] Step 6: By rotating the pressure ring, the top pin is moved, which in turn drives the rotating guide wheel to rotate (the lower end of the top pin drives the rotating guide wheel to rotate through the static friction between it and the outer axial end face of the rotating guide wheel), so that the rotating guide wheel boss and the low-pressure turbine disk boss are rotated relative to each other at an angle in a non-interference state to achieve assembly.

[0037] Step 7: Remove the top pin from one of the top pin holes on the pressure ring. Visually inspect whether the through hole of the rotating guide vane boss is aligned with the groove on the low-pressure turbine disk. If aligned, insert the pin into both the through hole of the rotating guide vane boss and the groove of the low-pressure turbine disk boss. Remove the axial interference fit tooling to complete the axial interference fit assembly of the rotating guide vane and the low-pressure turbine disk.

[0038] Alternatively, step one may include cleaning burrs and debris from the surfaces of the low-pressure turbine disk and the rotating guide vane, and smoothing the chamfers of the rotating guide vane.

[0039] Alternatively, in step two, before installing the rotating guide vane onto the low-pressure turbine disk, white paraffin wax is applied to the surfaces of the rotating guide vane and the low-pressure turbine disk to be assembled.

[0040] Alternatively, in step seven, after visually observing through the top pin hole that the through hole of the rotating guide vane boss is aligned with the groove on the low-pressure turbine disk, first insert a detection pin with an outer diameter smaller than the pin into the through hole, and then rotate the pressure ring. When the detection pin just falls from the through hole of the rotating guide vane boss into the groove of the low-pressure turbine disk boss, the through hole of the rotating guide vane boss is aligned with the groove on the low-pressure turbine disk.

[0041] Compared with the prior art, the tooling and method for axial interference fitting of the rotating guide vane and the low-pressure turbine disk of the present invention have the following characteristics:

[0042] (1) All the bosses on the rotating guide vane can be successfully installed on the low-pressure turbine disk bosses in one go and evenly.

[0043] (2) During installation, it can overcome the deformation problem caused by the rotational resistance due to axial interference fit, and the rotating guide wheel is not easily deformed.

[0044] (3) After installation, it can ensure that the through hole of the rotating guide wheel boss is aligned with the groove of the low-pressure turbine disk boss, and finally the pin is correctly placed for positioning. Attached Figure Description

[0045] Figure 1 This is a schematic diagram of the tooling used for axial interference fit of the rotating guide vane and the low-pressure turbine disk in this invention;

[0046] Figure 2 This is a schematic diagram of the low-pressure turbine disk and the rotating guide vane.

[0047] Figure 3 It is a schematic diagram of the pressure ring, the top pin hole on the pressure ring, and the 12 rotating bosses on the pressure ring;

[0048] In the diagram: 1. Base, 2. Support ring, 3. Positioning ring, 4. First screw, 5. Pressure ring, 6. Pressure plate, 7. Anti-rotation plate, 8. Pin, 9. First top pin, 10. Nameplate, 11. Second pin, 12. First pin, 13. Second screw, 14. Second top pin, 15. Centering ring, 16. First screw, 17. Operating lever, 18. Elastic retaining ring, 19. One-way thrust bearing, 20. Socket head cap screw, 21. Third screw, 22. Socket head cap screw, 23. Eye bolt, 24. Slotted pan head screw, 25. Cylindrical pin. Detailed Implementation

[0049] The present invention will be further described below with reference to specific embodiments, but it should not be construed as limiting the scope of the subject matter of the present invention to the following embodiments. All modifications, substitutions and alterations made based on ordinary technical knowledge and common practices in the art without departing from the above-described technical concept of the present invention are included within the scope of the present invention.

[0050] like Figure 2 The rotating guide vane material has a high elastic modulus and is a thin-walled part, making it challenging to synchronously and evenly install all 12 bosses with a significant axial interference fit. If even one boss is not properly installed axially while the rotating guide vane is being rotated, the boss surface will be compressed and damaged, posing a significant safety risk to the engine during later operation. The key technology for safely and reliably installing the rotating guide vane lies in designing a tooling and a clever assembly method based on the structural characteristics and fit between the rotating guide vane bosses and the low-pressure turbine disk bosses, to synchronously and evenly install all 12 bosses on the rotating guide vane.

[0051] Because of the 0.1–0.2 mm axial interference between the rotating guide vane and the low-pressure turbine disk (i.e., the axial interference between the mating surfaces of the rotating guide vane boss and the low-pressure turbine disk boss), coupled with the high elastic modulus and high coefficient of friction of the rotating guide vane, a strong force is required to cause the rotating guide vane and the low-pressure turbine disk to rotate relative to each other after they come into contact. When the two parts rotate relative to each other, the web of the low-pressure turbine disk will be scratched by the reinforcing ribs on the rotating guide vane, thus compromising the surface integrity of the low-pressure turbine disk. The key assembly point of this invention is: when the two parts rotate relative to each other under high stress, the web of the low-pressure turbine disk must not be scratched by the rotating guide vane.

[0052] Based on the above analysis, it can be seen that when assembling the rotating guide vane boss and the low-pressure turbine disk boss, all 12 assembly contact surfaces of the two should be assembled in a non-interference state (or in a very small interference state).

[0053] The solution proposed in this invention is as follows:

[0054] 1. Simulate and analyze the stress on the rotating guide vane under axial interference conditions of 0.1–0.2 mm, such as… Figure 2 Under this stress condition, there is a gap between the upper end face of the low-pressure turbine disk boss and the end face of the rotating guide wheel directly above the upper end face of the rotating guide wheel boss. This gap can be used to solve the interference fit resistance problem between the lower end face (i.e., the assembly surface) of the rotating guide wheel boss and the lower end face (i.e., the assembly surface) of the low-pressure turbine disk boss.

[0055] 2. Determine the installation scheme based on the stress condition of the rotating guide vane under large interference, and determine the tooling for installation.

[0056] 3. Fabricate tooling for axial interference fit between the rotating guide vane and the low-pressure turbine disk (e.g., Figure 1(As shown). The component includes a base 1, a support ring 2, a positioning ring 3, a first screw 4, a pressure ring 5, a pressure plate 6, an anti-rotation plate 7, a pin 8, a first top pin 9, a nameplate 10 (mounted on the base 1), a second pin 11, a first pin 12, a second screw 13, a second top pin 14, a centering ring 15, a first screw 16, an operating lever 17, an elastic retaining ring 18, a one-way thrust bearing 19, a hexagon socket head cap screw 20, a third screw 21, a hexagon socket head cap screw 22, an eye bolt 23, a slotted pan head screw 24, and a cylindrical pin 25. The support ring 2 is an annular component, coaxial with the base 1, and detachably mounted on the upper surface of the base 1; the positioning ring 3 is an annular component, coaxial with the base 1, and detachably mounted on the upper surface of the base 1 and located inside the inner annular surface of the support ring 2; the pressure plate 6 is connected to the base 1 via the first screw 4, and is located above the positioning ring 3; the pressure ring 5 is located below the pressure plate 6, is an annular component, and has 12 rotating bosses. The distribution positions of the top pin holes are consistent with those of the rotating guide wheel bosses. The top pin holes are opened on the rotating bosses, and the inner wall of the top pin holes contains a section of internal thread. The anti-rotation plate 7 is set between the positioning ring 3 and the pressure plate 6. The anti-rotation plate 7 is provided with at least one positioning pin hole and a pin 8 to prevent the low-pressure turbine disk from rotating and to fix it. The centering ring 15 is an annular part. The centering ring 15 is located between the outer ring surface of the positioning ring 3 and the inner ring surface of the pressure ring 5 to prevent the pressure ring 5 from accidentally damaging the rotating guide wheel when rotating. The support ring 2 and the positioning ring 3 are both connected to the upper end face of the base 1 by hexagonal head screws 22 and cylindrical pins 25. The base 1 is connected with eye bolts 23. The first screw 4 is positioned on the pressure plate 6 by an elastic retaining ring 18, and a one-way thrust bearing 19 is also assembled between the first screw 4 and the pressure plate 6 to facilitate the positioning and rotation of the first screw 4. The top pins include two types: first top pins 9 (11 pieces) and second top pins 14 (1 piece). The second top pin 14 has a threaded hole on its upper end face, while the first top pin 9 does not. The outer diameter of the first pin 12 (it should be noted that the outer diameter here refers to the outer diameter at the matching point with the through hole on the rotating guide vane boss and the groove on the low-pressure turbine disk boss) Figure 1The first pin 12 has three different outer diameters. The lowest and smallest outer diameter is the outer diameter referred to in this invention. The two outer diameters above it (for ease of handling and to ensure rigidity) are less than or equal to the diameter of the through hole on the rotating guide vane boss and the groove width on the low-pressure turbine disk boss. The second pin 12 serves as the pin that is finally inserted into the through hole of the rotating guide vane boss and the groove of the low-pressure turbine disk boss. The outer diameter of the second pin 11 (it should be noted that the definition of the outer diameter here is the same as the definition of the outer diameter of the first pin 12) is smaller than the outer diameter of the first pin 12, serving as... For inspection pins, the outer diameter of the inspection pin is only slightly smaller than the outer diameter of the first pin 12, for example, 0.05 mm smaller; the external thread of the second screw 13 matches the threaded hole on the end face of the second top pin 14, and is used to cooperate with the second top pin 14. When the second top pin 14 is put into the top pin hole, it is convenient to remove it from the top pin hole using the second screw 13; the external thread of the third screw 21 matches the internal thread on the inner wall of the top pin hole, and an operating rod 17 is vertically connected to the third screw 21. The lower end of the third screw 21 is used to drive the second top pin 14 and the first top pin 9.

[0057] 4. Before installation, carefully check the surface integrity of the two parts' mating surfaces. Ensure that the guide chamfers of the parts are within the dimensional tolerances required by the design. After inspection, use Fudis cleaner to clean the mating surfaces of the parts to ensure the cleanliness of the mating surfaces.

[0058] 5. After blowing the cleaning agent off all surfaces of the low-pressure turbine disk and rotating guide vane with compressed air, dry them.

[0059] 6. Install the base 1 of the axial interference fit tooling for the rotating guide vane and the low-pressure turbine disk onto the working platform, and fix the base 1 to the working platform with bolts.

[0060] 7. Install the low-pressure turbine disk onto base 1.

[0061] 8. Install and secure the anti-rotation plate 7 to the low-pressure turbine disk.

[0062] 9. Install the pressure ring 5 and pressure plate 6 in sequence, and tighten the first screw 4 at the same time.

[0063] 10. Insert the first top pin 9 and the second top pin 14 into the 12 top pin holes of the pressure ring 5 respectively, and then tighten the third screw 21 downwards so that the inner axial end face of the rotating guide wheel directly above the 12 rotating guide wheel bosses tends to be close to the upper end face of the low-pressure turbine disk boss.

[0064] 11. Use a feeler gauge to check the gap between the inner axial end face of the rotating guide vane and the upper end face of the low-pressure turbine disk boss. When the gap is approximately zero, it is considered that the two are completely fitted together.

[0065] 12. Using a wrench (with an opening matching the side length of the square rotating boss on the pressure ring 5, to facilitate locking the rotating boss on the pressure ring 5 for rotating the pressure ring 5), slightly rotate the pressure ring 5 to an angle so that the upper surface of the rotating guide vane boss engages with the lower surface of the low-pressure turbine disk boss (see...). Figure 2 ).

[0066] 13. Remove the third screw 21 and the second top pin 14 from one of the top pin holes. Drive the pressure ring 5 to continue rotating the rotating guide wheel with a wrench. Visually inspect that the through hole of the rotating guide wheel boss is basically aligned with the groove of the low-pressure turbine disk boss.

[0067] 14. Continue rotating the rotating guide wheel until the first pin 12 can be inserted into the through hole of the rotating guide wheel boss and the slot of the low-pressure turbine disk boss at the same time. At this point, the rotating guide wheel installation is complete.

[0068] The following section will detail the axial interference fit method for the rotating guide vane and the low-pressure turbine disk:

[0069] Step 1: Collect one low-pressure turbine disc and one rotating guide vane.

[0070] Step 2: Carefully inspect all surfaces of the low-pressure turbine disc and the rotating guide vane. There should be no bumps, scratches, or burrs. Pay special attention to the burrs on the reinforcing ribs of the rotating guide vane.

[0071] Step 3: Use 400# sandpaper to clean the chamfered edges of the rotating guide vane reinforcing ribs to prevent scratching the low-pressure turbine disk during installation. Also, clean the mating surfaces of the rotating guide vane and the low-pressure turbine disk to remove any debris that could prevent proper installation.

[0072] Step 4: Install base 1 on a fixed platform and secure base 1 to the platform to prevent parts from moving during subsequent press-fitting due to the axial interference fit of the rotating guide vane and the low-pressure turbine disk not being fixed.

[0073] Step 5: Clean the base 1 and the end face of the low-pressure turbine disk. Install the low-pressure turbine disk onto the support ring 2 and positioning ring 3 of the base 1. The support ring 2 supports the lower end face of the low-pressure turbine disk, and the positioning ring 3 passes through the center hole of the low-pressure turbine disk to achieve center positioning. Then install the anti-rotation plate 7. Note that the pin 8 should be aligned with the hole on the low-pressure turbine disk so that the tooling can restrict the circumferential rotation of the low-pressure turbine disk. Then tighten the hexagon socket head cap screw 20 to ensure that the anti-rotation plate 7 is stably fixed on the upper end of the positioning ring 3.

[0074] Step 6: Apply white paraffin wax to the web of the low-pressure turbine disk and the end face that mates with the rotating guide vane.

[0075] Step 7: Install the rotating guide vane onto the low-pressure turbine disk from above. Make sure the low-pressure turbine disk bosses and the rotating guide vane bosses are aligned. This alignment means that each of the 12 low-pressure turbine disk bosses is paired with one of the 12 rotating guide vane bosses, so that each rotating guide vane boss is close to one of the low-pressure turbine disk bosses in the circumferential direction of the low-pressure turbine disk. The circumferential clamping between the two is close to zero degrees, but there is a gap between them in the axial direction of the low-pressure turbine disk.

[0076] Step 8: Using a set of feeler gauges, check the clearance between the upper end face of the low-pressure turbine disc boss and the inner end face of the rotating guide vane, and record the actual value. Check the clearance position as follows: Figure 2 As shown.

[0077] Step 9: Install the pressure ring 5. When installing, make sure to align the square rotating boss on the pressure ring 5 with the through hole of the rotating guide wheel so that the 12 pin holes on the pressure ring and the 12 rotating guide wheel boss through holes on the rotating guide wheel are aligned.

[0078] Step 10: Install the pressure plate 6 on the pressure ring 5, and then tighten the first screw 4 so that the lower end of the pressure plate 6 is pressed against the pressure ring 5. At this time, be careful not to overtighten the first screw 4. Use a torque of about 20 N·m to tighten it.

[0079] Step 11: Using manual force, rotate the third screw 21 sequentially by operating lever 17, causing the first top pin 9 and the second top pin 14 to move downwards. The downward force will bring the inner axial end face of the rotating guide vane into contact with the upper end face of the low-pressure turbine disk boss, thus... Figure 2 The inspection gap position shown is aligned.

[0080] Step 12: Use a 0.03mm feeler gauge to check if... Figure 2 As shown in the gap position, when the 0.03mm feeler gauge does not pass through at the 12 contact positions, it is considered that the inner axial end face of the rotating guide vane and the upper end face of the low-pressure turbine disk boss are in contact.

[0081] Step 13: Use a wrench to hold the square rotating boss of the pressure ring 5 (e.g., Figure 3 As shown, the 12 square rotating bosses allow the rotating guide wheel to rotate at a small angle, so that the upper surface of the rotating guide wheel boss gradually overlaps with the lower surface of the low-pressure turbine disk boss until they are almost completely overlapped. At this time, the two end faces gradually overlap in a non-interference state (assembly).

[0082] Step 14: Remove one of the 12 third screws 21, and use the second screw 13 to insert into the threaded hole on the upper end face of the second top pin 14 to remove the second top pin 14.

[0083] Step 15: While rotating the pressure ring 5, visually check whether the through hole of the rotating guide wheel boss is aligned with the groove of the low-pressure turbine disk boss.

[0084] Step 16: When visually inspecting the blocks for alignment, use the second pin 11 to insert into the through hole of the rotating guide wheel boss.

[0085] Step 17: Slightly rotate the pressure ring 5. When the second pin 11 is just inserted into the through hole of the rotating guide wheel boss and the groove of the low-pressure turbine disk boss at the same time, it means that the rotating guide wheel has been rotated into place. Take out the second pin 11 and put in the first pin 12.

[0086] Step 18: Disassemble the tooling in sequence. After the force of the 11 first top pins 9 disappears, the rotating guide wheel boss will be axially interference-fitted with the low-pressure turbine disk boss through its own elastic deformation. Then, insert the first pin 12 into the through holes of the remaining 11 rotating guide wheel bosses and the slots of the low-pressure turbine disk bosses to finally complete the installation of the rotating guide wheel.

[0087] Contents not described in detail in this specification are prior art known to those skilled in the art. Although illustrative specific embodiments of the invention have been described above to facilitate understanding by those skilled in the art, it should be understood that the invention is not limited to the scope of the specific embodiments. Various modifications are readily apparent to those skilled in the art as long as they fall within the spirit and scope of the invention as defined and determined by the appended claims, and all inventions utilizing the concept of this invention are protected.

Claims

1. A tooling for axial interference fit of a rotating guide vane and a low-pressure turbine disk, characterized in that, include: Base (1); Support ring (2), the support ring (2) is an annular part, the support ring (2) is coaxial with the base (1) and the support ring (2) is detachably installed on the upper end face of the base (1); Positioning ring (3), the positioning ring (3) is a ring-shaped part, the positioning ring (3) is coaxial with the base (1) and the positioning ring (3) is detachably installed on the upper end face of the base (1) and located inside the inner ring surface of the support ring (2); Pressure plate (6), the pressure plate (6) is connected to the base (1) by the first screw (4), and the pressure plate (6) is located above the positioning ring (3); Pressure ring (5), the pressure ring (5) is located below the pressure plate (6), the pressure ring (5) is an annular part, and has a top pin hole, and the number and distribution position of the top pin hole are consistent with the number and distribution position of the rotating guide wheel boss; Anti-rotation plate (7), the anti-rotation plate (7) is disposed between the positioning ring (3) and the pressure plate (6), and the anti-rotation plate (7) is provided with at least one positioning pin hole and a pin (8); Centering ring (15), the centering ring (15) is an annular component, the centering ring (15) is located between the outer ring surface of the positioning ring (3) and the inner ring surface of the pressure ring (5); Top pin, which is fitted into the top pin hole of the pressure ring (5).

2. The tooling for axial interference fit installation of a rotating guide vane and a low-pressure turbine disk according to claim 1, characterized in that: The support ring (2) and the positioning ring (3) are both connected to the upper surface of the base (1) by hexagonal head screws (22) and cylindrical pins (25).

3. The tooling for axial interference fit installation of a rotating guide vane and a low-pressure turbine disk according to claim 1, characterized in that: The base (1) is connected to a lifting eye screw (23).

4. The tooling for axial interference fit of a rotating guide vane and a low-pressure turbine disk according to claim 1, characterized in that: The first screw (4) is positioned on the pressure plate (6) by an elastic retaining ring (18), and a one-way thrust bearing (19) is also assembled between the first screw (4) and the pressure plate (6).

5. The tooling for axial interference fit of a rotating guide vane and a low-pressure turbine disk according to claim 1, characterized in that: The inner wall of the top pin hole contains an internal thread; The top pin includes a first top pin (9) and a second top pin (14), wherein a threaded hole is opened on one end face of the second top pin (14); The pressure ring (5) is provided with a rotating boss, and the number and distribution of the rotating boss are the same as the number and distribution of the rotating guide wheel boss. The top pin hole is opened on the rotating boss.

6. The tooling for axial interference fit installation of a rotating guide vane and a low-pressure turbine disk according to claim 5, characterized in that, Also includes: The outer diameter of the first pin (12) is less than or equal to the diameter of the through hole on the rotating guide wheel boss and the groove width on the low-pressure turbine disk boss. The outer diameter of the second pin (11) is smaller than that of the first pin (12); The second screw (13) has an external thread that matches the threaded hole on the end face of the second top pin (14); The third screw (21) has an external thread that matches the internal thread on the inner wall of the top pin hole, and an operating rod (17) is vertically connected to the third screw (21).

7. A method for axial interference fit installation of a rotating guide vane and a low-pressure turbine disk, characterized in that, The tooling for axial interference fit of the rotating guide vane and the low-pressure turbine disk as described in claim 1 includes the following steps: Step 1: Install the low-pressure turbine disk onto the base (1), support the lower end of the low-pressure turbine disk with the support ring (2), and position the center hole of the low-pressure turbine disk with the outer ring surface of the positioning ring (3); Step 2: Place the anti-rotation plate (7) on the upper end of the low-pressure turbine disk and the positioning ring (3) at the same time, fix the anti-rotation plate (7) and the positioning ring (3) with the connector, fix the low-pressure turbine disk and the base (1) with the positioning pin hole and pin (8) on the anti-rotation plate (7), and then install the rotating guide wheel on the low-pressure turbine disk. During installation, ensure that one rotating guide wheel boss is paired with one low-pressure turbine disk boss and close to it. Measure the axial clearance value between the axial end face of the rotating guide wheel and the low-pressure turbine disk boss directly above each rotating guide wheel boss. Step 3: Place the pressure ring (5) on the rotating guide wheel and ensure that the top pin hole is aligned with the rotating guide wheel boss. Then place the pressure plate (6) on the pressure ring (5). Next, pass the first screw (4) through the pressure plate (6) and screw it into the base (1). Step 4: Apply pressure to the pins in all the pin holes on the pressure ring (5) so that the pins push the rotating guide wheel to deform towards the low-pressure turbine disk boss until the axial clearance between the axial end face of the rotating guide wheel directly above the low-pressure turbine disk boss and the low-pressure turbine disk boss decreases and tends to fit together, while the axial interference between the rotating guide wheel boss and the low-pressure turbine disk boss decreases. Step 5: Measure the axial clearance between the axial end face of the rotating guide wheel directly above the low-pressure turbine disk boss and the low-pressure turbine disk boss. If it is less than the axial interference between the rotating guide wheel boss and the low-pressure turbine disk boss and close to zero, continue to step 6. If it does not meet the requirements, adjust the top pin in the corresponding position of the top pin hole on the pressure ring (5) until the axial clearance requirement is met. Step 6: By rotating the pressure ring (5), the top pin is moved, which in turn drives the rotating guide wheel to rotate, so that the rotating guide wheel boss and the low-pressure turbine disk boss rotate relative to each other at an angle in a non-interference state to achieve assembly; Step 7: Remove the top pin in one of the top pin holes on the pressure ring (5). Visually observe through the top pin hole whether the through hole of the rotating guide wheel boss is aligned with the groove on the low-pressure turbine disk. If aligned, insert the pin into both the through hole of the rotating guide wheel boss and the groove of the low-pressure turbine disk boss at the same time. Remove the axial interference fit tooling to complete the axial interference fit assembly of the rotating guide wheel and the low-pressure turbine disk.

8. The axial interference fit method for a rotating guide vane and a low-pressure turbine disk according to claim 7, characterized in that: Before step one, the process also includes cleaning burrs and debris from the surfaces of the low-pressure turbine disk and the rotating guide wheel, and smoothing the chamfers of the rotating guide wheel.

9. The axial interference fit method for a rotating guide vane and a low-pressure turbine disk according to claim 7, characterized in that: In step two, before installing the rotating guide vane onto the low-pressure turbine disk, white paraffin wax is applied to the surfaces of the rotating guide vane and the low-pressure turbine disk to be assembled.

10. The axial interference fit method for a rotating guide vane and a low-pressure turbine disk according to claim 7, characterized in that: In step seven, after visually observing that the through hole of the rotating guide wheel boss is aligned with the groove on the low-pressure turbine disk through the top pin hole, first insert a detection pin with an outer diameter smaller than the pin into the through hole, and then rotate the pressure ring (5). When the detection pin just falls from the through hole of the rotating guide wheel boss into the groove of the low-pressure turbine disk boss, the through hole of the rotating guide wheel boss is aligned with the groove on the low-pressure turbine disk.

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