Engine rotor blade combination machining replacement tool for maintenance and machining method

Abstract

The invention relates to the technical field of aero-engines, and discloses an engine rotor blade combination machining replacement tool for maintenance, clamping of an old blade tenon is completed through a jacking mechanism and a tenon groove, and a blade tip of an old blade is clamped through a blade back positioning block and a blade basin positioning block; the standard curved surface of the blade back positioning block and the standard curved surface of the blade basin positioning block are flush with the blade tip of the old blade at the same time, precise positioning and clamping of the blade are achieved, the assembly state of the blade in a rotor is restored, the blade tip size of the old blade is transmitted to a replacement tool, then a new blade is clamped to the tool, and association of the blade tip sizes of the new blade and the old blade is achieved. At the moment, the part, higher than the standard curved surface, of the new blade tip is the part needing to be machined and removed. The invention further discloses an engine rotor blade combination machining replacement machining method for maintenance, accurate positioning and clamping of the blade are achieved through the replacement tool, machine tool machining is replaced with manual plier repair, and the repair quality and efficiency are improved.

Description

TECHNICAL FIELD

[0001] The application relates to the technical field of aero-engines and discloses an engine rotor blade combined machining replacement tool and a machining method for maintenance. BACKGROUND

[0002] The reliability of blades directly affects the flight safety of aero-engines. Under an extreme combined working condition, the blades need to bear high-speed aerodynamic load, centrifugal load, vibration load and high-temperature gas corrosion and the like, so that tip cracks and wear damage are generally generated after the blades are operated, and then the engine thrust is attenuated. As core vulnerable components of the aero-engines, the blades have a very high replacement rate in the engine overhaul cycle. In the maintenance process, the blades with excessive damage need to be replaced by new blades, and the tip of the new blade needs to be ground according to the tip profile size of the old blade to ensure a proper tip gap.

[0003] Regarding the tip machining method of the new blade, the prior art is that after the new blade is installed on the rotor, the rotor is clamped on a machine tool, the tip sizes of the new and old blades are measured, and then the tip of the new blade is machined. However, the prior art has the following problems: first, since the number of blades to be machined is small and the machining allowance of each blade is inconsistent, the overall machining quality is affected; second, the clamping and positioning of the rotor is relatively cumbersome, special tool clamps are needed, and in the case of the feed amount setting of the machine tool, the blades with large residual amount need to be machined for several hours, the efficiency is low, and it is difficult to respond to the rapid support demand; third, the equipment resources, working hours and costs occupied by the tip machining are relatively high. SUMMARY

[0004] The application aims to provide an engine rotor blade combined machining replacement tool for maintenance, which restores the assembly state of the blades in the rotor through accurate positioning and clamping of the blades, correlates the tip sizes of the new and old blades, and is convenient for manual repair to replace machine tool machining, is suitable for tip size machining under the condition of a small number of blades, and can improve repair quality and efficiency.

[0005] The application also aims to provide an engine rotor blade combined machining replacement machining method for maintenance, which realizes accurate positioning and clamping of the blades through the replacement tool, restores the assembly state of the blades in the rotor, correlates the tip sizes of the new and old blades, and replaces machine tool machining through manual repair to improve repair quality and efficiency.

[0006] In order to achieve the above technical effects, the technical scheme adopted by the application is as follows:

[0007] The engine rotor blade combined machining replacement tool for maintenance comprises:

[0008] a base;

[0009] A tenon positioning seat is fixed to the base, and is provided with a tenon slot for accommodating a tenon. A positioning surface is arranged in the tenon slot. The tenon positioning seat is further provided with a clamping mechanism for clamping a blade. The tenon slot is further provided with a stopper at one end, which is used for abutting against one end of the tenon when the blade is clamped.

[0010] A tip positioning mechanism includes a blade back positioning block and a blade basin positioning block which can be combined and clamped to the tip of a blade. The positions of the blade back positioning block and the blade basin positioning block can be adjusted along the radial direction of the blade. The top of the blade back positioning block and the top of the blade basin positioning block are both provided with a standard curved surface which is used for being flush with the tip of the blade when the blade is clamped.

[0011] Further, the tenon positioning seat is provided with a clamping sliding slot which is in communication with the tenon slot. The clamping mechanism further includes a locking assembly and a clamping inclined block which is provided with a clamping inclined surface and is arranged in the clamping sliding slot. The locking assembly is connected with the clamping inclined block and is used for driving the clamping inclined block to slide along the clamping sliding slot so as to clamp or release the clamping inclined block.

[0012] Further, the locking assembly includes a shoulder nut and a screw rod. The screw rod is fixed with the clamping inclined block, and the shoulder nut is arranged outside the clamping sliding slot and is threadedly connected with the screw rod.

[0013] Further, the tip positioning mechanism further includes a support which is slidingly connected with the base. The blade back positioning block and the blade basin positioning block are respectively matched with one support and are connected with the support. The blade back positioning block and the blade basin positioning block can be slidingly adjusted in position along the support.

[0014] Further, the blade back positioning block and the blade basin positioning block are both provided with a guide protrusion, and are respectively provided with a fixing bolt which is used for fixing with the support. The support is provided with a lifting sliding slot along the radial direction of the blade, and the lifting sliding slot is provided with a lifting waist-shaped hole. The guide protrusion slides in the lifting sliding slot, and the fixing bolt penetrates through the lifting waist-shaped hole and can slide in the lifting waist-shaped hole.

[0015] Further, the support is provided with a transverse waist-shaped hole which is used for adjusting the transverse position of the support.

[0016] Further, at least one transverse guide block is arranged on each side of the support. The transverse guide blocks are fixed with the base. The area between the transverse guide blocks on the two sides of the support is defined as a transverse channel for the sliding of the support.

[0017] A combined machining method for replacing machining of engine rotor blades during maintenance, which uses the replacement tooling as described above to clamp new and old blades, and the machining method comprises:

[0018] S1. Make the back of the leaf positioning block and the leaf basin positioning block move in the opposite direction back to the preset distance;

[0019] S2. The tenon of the old blade is placed into the tenon slot, and the tenon is tightened with the tightening inclined block to force the pressure surface of the tenon to fit with the positioning surface;

[0020] S3. The back of the leaf positioning block and the leaf basin positioning block are moved towards each other until the back of the leaf positioning block and the leaf basin positioning block are combined to fit the blade body;

[0021] S4. Adjust the height of the back of the leaf positioning block and the leaf basin positioning block relative to the positioning surface, so that the standard curved surfaces of the two are flush with the tip of the old blade, and then fix the height of the back of the leaf positioning block and the leaf basin positioning block;

[0022] S5. The back of the leaf positioning block and the leaf basin positioning block are moved away from the old blade in the opposite direction, and the old blade is taken out of the tenon slot, and then the tenon of the new blade is placed into the tenon slot, and the tenon is tightened with the tightening inclined block to force the pressure surface of the tenon to fit with the positioning surface;

[0023] S6. The back of the leaf positioning block and the leaf basin positioning block are moved towards each other until the back of the leaf positioning block and the leaf basin positioning block are combined to hold the blade body;

[0024] S7. Remove the tip part higher than the standard curved surface, and after processing, take out the new blade and process the next blade.

[0025] Further, when the tightening inclined block is locked, the calculation method of the number of turns of the shoulder nut is: when the blade is installed or removed, the gap between the bottom surface of the blade tenon and the tightening inclined surface is selected, and the number of turns of the shoulder nut is calculated according to the following formula:

[0026]

[0027] Wherein, p is the pitch of the shoulder nut (32), n is the number of turns of the shoulder nut (32) when clamped, d is the measured gap between the bottom surface of the tenon and the tightening inclined surface (311) when the blade is installed or removed, and α is the angle of the tightening inclined surface (311).

[0028] Compared with the prior art, the present application has the following beneficial effects:

[0029] The old blade tenon is clamped by the pressing mechanism and the tenon groove, the tip of the old blade is clamped by the back positioning block and the basin positioning block, the standard curved surface of the back positioning block and the standard curved surface of the basin positioning block are flush with the tip of the old blade at the same time, the precise positioning and clamping of the blade are realized, the assembly state of the blade in the rotor is restored, the tip size of the old blade is transmitted to the replacement tool, and then the new blade is clamped on the tool, that is, the correlation of the tip sizes of the new and old blades is realized, the part of the new blade tip which is higher than the standard curved surface is the part which needs to be machined and removed, and the machining of the new blade tip can be completed by manual repair, compared with the prior art, the machining of the machine tool is replaced, the rotor is avoided from being clamped on the machine tool and the blade is avoided from being machined, the machining of the tip size is suitable for the case that the number of blades is small, the cost can be saved, and the repair quality and efficiency are improved. BRIEF DESCRIPTION OF DRAWINGS

[0030] Figure 1 Structure schematic view of the engine rotor blade combined machining replacement tool for repair in the embodiment;

[0031] Figure 2 is a top view of Figure 1 ;

[0032] Figure 3 is an A-A sectional view of Figure 2 ;

[0033] Figure 4 is an enlarged schematic view of part B of Figure 2 ;

[0034] Figure 5 is a schematic view of the tenon bottom surface pressed by the inclined block in the embodiment;

[0035] Figure 6 is a schematic view of the old blade clamped by the replacement tool in the embodiment;

[0036] Figure 7 is a schematic view of the tenon and the pressing inclined surface of the inclined block in the embodiment;

[0037] Figure 8 is a flow chart of the engine rotor blade combined machining replacement machining method for repair in the embodiment;

[0038] Wherein, 1-base, 2-tenon positioning seat, 21-tenon groove, 211-positioning surface, 22-stop block, 23-pressing sliding groove, 31-pressing inclined block, 311-pressing inclined surface, 32-shouldered nut, 33-screw rod, 4-stand, 41-transverse waist-shaped hole, 42-lifting sliding groove, 43-lifting waist-shaped hole, 51-back positioning block, 52-basin positioning block, 53-guiding protrusion, 54-standard curved surface, 6-transverse guiding block, 7-positioning seat guiding block. DETAILED DESCRIPTION

[0039] The present invention will now be described in further detail with reference to the embodiments and accompanying drawings. However, this should not be construed as limiting the scope of the above-described subject matter of the present invention to the following embodiments; all technologies implemented based on the content of the present invention fall within the scope of the present invention.

[0040] Example 1

[0041] See Figures 1-7 Replacement tooling for machining engine rotor blades for maintenance, including:

[0042] Base 1;

[0043] The tenon positioning seat 2 is fixed on the base 1. The tenon positioning seat 2 is provided with a tenon groove 21 for accommodating the tenon. The tenon groove 21 is provided with a positioning surface 211. The tenon positioning seat 2 is also provided with a clamping mechanism for clamping the tenon when holding the old blade, forcing the pressure surface of the tenon to fit with the positioning surface 211. One end of the tenon groove 21 is also provided with a stop block 22, which is used to fit tightly against one end of the tenon when holding the old blade.

[0044] The leaf tip positioning mechanism includes a leaf back positioning block 51 and a leaf basin positioning block 52 that can be combined and clamped at the leaf tip. The positions of the leaf back positioning block 51 and the leaf basin positioning block 52 can be adjusted radially along the leaf. The top of the leaf back positioning block 51 and the top of the leaf basin positioning block 52 both have a standard curved surface 54, which is used to be flush with the leaf tip when clamping an old leaf. In this embodiment, the base 1 serves as the support structure for the entire tooling, and the tenon positioning seat 2 is fixed on the base 1. The design of the tenon groove 21 not only accommodates the tenon, but also positions the tenon in the groove by setting a stop block 22 at one end of the tenon groove 21. The precise positioning of the tenon is achieved through the cooperation of the positioning surface 211 and the clamping mechanism, ensuring the stability and accuracy of the tenon during the clamping process. This simulates the assembly state of the blade on the rotor. At this time, the tenon pressure surface of the old blade or the positioning surface 211 of the tenon groove 21 in the tooling is the first positioning reference for transferring the blade tip size of the old blade to the tooling, providing a basis for the correlation of the blade tip size of the new and old blades. In this embodiment, the blade tip positioning mechanism uses the blade back positioning block 51 and the blade base positioning block 52 to clamp the blade tip together. The blade back positioning block 51 has a curved surface similar to the shape of the blade back, and similarly, the blade base positioning block 52 also has a curved surface similar to the shape of the blade base, so as to achieve close clamping of the blade. Moreover, the positions of the blade back positioning block 51 and the blade base positioning block 52 can be adjusted radially along the blade, so that the tooling of this embodiment can adapt to old blades of different sizes within the design range, improving the versatility and practicality of the tooling. This embodiment also designs a standard curved surface 54 on the top of the blade back positioning block 51 and the blade base positioning block 52 to ensure that the blade tip is flush with the standard curved surface 54 during the clamping process. At this time, the standard curved surface 54 is the second positioning reference for transferring the blade tip size of the old blade to the tooling. Through the cooperation of the base 1, the tenon positioning seat 2 and the blade tip positioning mechanism, this embodiment achieves precise clamping of the old blade, determines the first positioning reference and the second positioning reference, and associates the blade tip size of the old blade with the tooling, providing a precise reference for the subsequent blade tip processing of the new blade.

[0045] It should be noted that, see Figure 1 On both sides of the tenon positioning seat 2, there are positioning seat guide blocks 7. The positioning seat guide blocks 7 are positioned by positioning pins and fixed to the base 1 by bolts, so as to realize the positioning of the tenon positioning seat 2.

[0046] It should be noted that during the clamping process, in order to ensure that the blade tip is flush with the standard curved surface 54, the degree of flushness between the blade tip and the standard curved surface 54 can be measured by using a knife-edge ruler or a lever dial indicator. If the measurement results show that the degree of flushness between the blade tip and the standard curved surface 54 does not meet the requirements, the blade back positioning block 51 and the blade base positioning block 52 are finely adjusted until the degree of flushness between the blade tip and the standard curved surface 54 meets the requirements, and then the positions of the blade back positioning block 51 and the blade base positioning block 52 are fixed.

[0047] It should be noted that the standard curved surface 54 is a curved surface that is consistent with the blade tip profile. Compared with the new blade, although the blade tip profile size of the old blade has changed, the blade tip profile size is still within the tolerance range. It can be understood as being parallel to the standard curved surface 54. Since the blade tip profile is a large conical surface, the shape of the blade tip profile of the old blade changes very little within the tolerance range. Therefore, the difference in the blade tip profile size between the new and old blades can be understood as the shape of the blade tip remaining unchanged, with only the size difference along the radial direction, i.e., along the height direction of the tooling. Therefore, the blade tip profile positioning of the new and old blades can be directly achieved by adjusting the blade back positioning block 51 and the blade base positioning block 52 up and down to make the standard curved surface 54 flush with the blade tip of the old blade.

[0048] In this embodiment, see Figure 1 , 3 5. The tenon positioning seat 2 is provided with a tightening groove 23, which is connected to the tenon groove 21. The tightening mechanism also includes a locking component and a tightening inclined block 31 with a tightening inclined surface 311. The tightening inclined block 31 is located in the tightening groove 23 and can slide in the length direction of the tightening groove 23. The locking component includes a shoulder nut 32 and a screw 33. The screw 33 is fixed to the tightening inclined block 31, and one end of the screw 33 extends to the outside of the tightening groove 23 and is threadedly connected to the shoulder nut 32. The diameter of the shoulder nut 32 is larger than the groove width of the tightening groove 23. By rotating the shoulder nut 32, the screw 33 can be driven to move along the direction of the tightening groove 23, thereby driving the tightening inclined block 31 to slide, so as to tighten or release the tightening inclined block 31. When the tenon needs to be tightened, the shoulder nut 32 is rotated forward, and the screw 33 drives the tightening wedge block 31 to slide along the tightening groove 23. The tightening wedge block 31 gradually tightens the bottom surface of the tenon with its tightening wedge surface 311 until the pressure surface of the tenon is in close contact with the positioning surface 211 of the tenon groove 21, and the tenon is firmly clamped in the tenon positioning seat 2. When the tenon needs to be released, the shoulder nut 32 is rotated in the reverse direction, and the screw 33 drives the tightening wedge block 31 to slide in the reverse direction along the tightening groove 23 until the tightening wedge block 31 is completely disengaged from the tenon. This design ensures the stability and accuracy of the tenon during the clamping process, simulating the assembly state of blades on a rotor. At the same time, by adjusting the number of rotations of the shoulder nut 32, the tightening force of the tightening wedge block 31 on the tenon can be flexibly controlled, allowing the tooling to adapt to the clamping requirements of tenons of different sizes within the design range. In addition, the locking assembly has a simple and reliable structure, is easy to operate and maintain, and further improves the convenience and practicality of the entire tooling.

[0049] In this embodiment, the leaf tip positioning mechanism further includes a support 4 slidably connected to the base 1. The leaf back positioning block 51 and the leaf base positioning block 52 are each matched with a support 4 and connected to the support 4. Both the leaf back positioning block 51 and the leaf base positioning block 52 can be slidably adjusted along the support 4. Specifically, as shown... Figure 1 and Figure 2As shown, the direction in which the blade back positioning block 51 and the blade base positioning block 52 clamp the blade or move away from the blade is the lateral direction. The support 4 is provided with a lateral oblong hole 41 for adjusting the lateral position of the support 4. The support 4 is locked to the base 1 by bolts, and the bolts pass through the lateral oblong hole 41. The length of the lateral oblong hole 41 is the travel of the support 4. Before clamping the blade, the bolts are loosened, so that the supports 4 corresponding to the blade back positioning block 51 and the blade base positioning block 52 move in opposite directions, so that the distance between the blade back positioning block 51 and the blade base positioning block 52 is increased, making it easier to insert the blade. After the tenon of the blade is fixed on the tenon positioning seat 2, the supports 4 corresponding to the blade back positioning block 51 and the blade base positioning block 52 move towards each other, so that the blade back positioning block 51 and the blade base positioning block 52 clamp the blade together.

[0050] In this embodiment, see Figure 1 , 3 and Figure 4 Both the leaf back positioning block 51 and the leaf base positioning block 52 are provided with guide protrusions 53, and each of the leaf back positioning block 51 and the leaf base positioning block 52 is provided with fixing bolts for fixing to the support 4. The support 4 is provided with a lifting groove 42 parallel to the radial direction of the blade, and a lifting waist-shaped hole 43 is provided in the lifting groove 42. The guide protrusion 53 slides in the lifting groove 42, and the fixing bolt passes through the lifting waist-shaped hole 43 and can slide in the lifting waist-shaped hole 43. In this embodiment, through the cooperation of the guide protrusion 53 and the lifting groove 42, the leaf back positioning block 51 and the leaf base positioning block 52 can only be finely adjusted along the radial direction of the blade, ensuring that the leaf back positioning block 51 and the leaf base positioning block 52 cannot rotate during the lifting and fine adjustment process. Meanwhile, the design of the lifting waist-shaped hole 43 allows the fixing bolt to slide within a certain range, which means that the blade back positioning block 51 and the blade basin positioning block 52 can slide within a certain range, increasing the flexibility of adjustment and making the tooling applicable to blades of different sizes within the design range, enhancing the versatility and practicality of the tooling, and providing a structural basis for the standard curved surface 54 of the blade back positioning block 51 and the blade basin positioning block 52 to be flush with the blade tip.

[0051] In this embodiment, see Figure 1 and Figure 2Each side of the support 4 is provided with at least one transverse guide block 6. The transverse guide block 6 is positioned by a locating pin and fixed to the base 1 by bolts. The area between the transverse guide blocks 6 on both sides of the support 4 is defined as a transverse channel for the support 4 to slide, and a small clearance fit is formed between the support 4 and the transverse guide blocks 6. In this embodiment, the fixed connection between the transverse guide blocks 6 and the base 1 ensures the stability and accuracy of the support 4 when sliding in the transverse channel. The formation of the transverse channel provides a clear sliding path for the support 4, and the cooperation between the transverse guide blocks 6 and the transverse channel also restricts the rotation of the support 4. When the support 4 slides in the transverse direction, the transverse guide blocks 6 can prevent the support 4 from rotating unnecessarily, thereby ensuring the stability and accuracy of the leaf back positioning block 51 and the leaf basin positioning block 52 in the process of positioning the leaf tip.

[0052] Example 2

[0053] See Figure 8 This embodiment provides a method for alternative machining of engine rotor blades for maintenance, using the alternative tooling described in Embodiment 1 to clamp new and old blades. The machining method includes:

[0054] S1. Loosen the bolts of the locking support 4, move the support 4, and move the blade back positioning block 51 and the blade basin positioning block 52 in opposite directions by a preset distance so as to clamp the blade.

[0055] S2. Install the old blades removed from the rotor onto the tooling, and place the tenon of the old blade into the tenon groove 21, ensuring that one end of the tenon is tightly attached to the stop block 22. Then rotate the shoulder nut 32 to make the clamping wedge block 31 press against the bottom surface of the tenon, forcing the pressure surface of the tenon to fit against the positioning surface 211, thus completing the positioning and clamping of the tenon.

[0056] S3. Move the support 4 until the leaf back positioning block 51 and the leaf basin positioning block 52 are joined together and attached to the leaf body, and then lock the two supports 4. It should be noted that in this step, the leaf back positioning block 51 and the leaf basin positioning block 52 only need to be attached to the leaf, and it is not necessary to clamp the leaf, so as to facilitate the subsequent adjustment of the height of the leaf back positioning block 51 and the leaf basin positioning block 52.

[0057] S4. Loosen the fixing bolts of the locking blade back positioning block 51 and the blade basin positioning block 52 respectively, adjust the height of the blade back positioning block 51 and the blade basin positioning block 52 relative to the positioning surface 211 so that the standard curved surface 54 of the blade back positioning block 51 and the blade basin positioning block 52 is flush with the tip of the old blade, and then tighten the blade back positioning block 51 and the blade basin positioning block 52 to fix the height of the blade back positioning block 51 and the blade basin positioning block 52.

[0058] It should be noted that during the clamping process, in order to ensure that the blade tip is flush with the standard curved surface 54, the degree of flushness between the blade tip and the standard curved surface 54 can be measured by using a knife-edge ruler or a lever dial indicator. If the measurement results show that the degree of flushness between the blade tip and the standard curved surface 54 does not meet the requirements, the blade back positioning block 51 and the blade base positioning block 52 are finely adjusted until the degree of flushness between the blade tip and the standard curved surface 54 meets the requirements, and then the positions of the blade back positioning block 51 and the blade base positioning block 52 are fixed.

[0059] S5. Loosen the bolts of the locking support 4, move the support 4 so that the blade back positioning block 51 and the blade basin positioning block 52 move away from the old blade in opposite directions, release the tenon, take the old blade out of the tenon groove 21, and then place the tenon of the new blade into the tenon groove 21, ensuring that one end of the tenon is in close contact with the stop block 22, and use the tightening inclined block 31 to tighten the tenon, forcing the pressure surface of the tenon to fit with the positioning surface 211.

[0060] S6. Move the support 4 so that the leaf back positioning block 51 and the leaf basin positioning block 52 move towards each other until the leaf back positioning block 51 and the leaf basin positioning block 52 merge to clamp the leaf body.

[0061] S7. Remove the blade tip portion exceeding the standard curvature of 54. After machining using a manual clamping method, remove the new blade and proceed with the clamping and machining of the next blade. It should be noted that if several old blades of the same rotor and same stage need to be replaced, only one old blade needs to be clamped with a replacement fixture, the blade tip is positioned, and the blade tip size of the old blade is associated with the replacement fixture. Then, the new blades to be replaced are machined one by one. It is not necessary to reposition each one, because the blade tips of the same rotor and same stage have the same size.

[0062] In this embodiment, see Figure 5 The blade tenon and the clamping inclined surface 311 of the clamping block 31 fit tightly together. This precise clamping process relies on the accurate tightening of the shoulder nut 32. If the angle of the clamping inclined surface 311 is not set properly, such as too large an angle, the contact resistance between the blade tenon and the clamping inclined block 31 will increase significantly, making clamping difficult. Conversely, if the angle is too small, it will increase the number of turns required to tighten the shoulder nut 32, resulting in cumbersome operation and reduced efficiency. Therefore, the method for calculating the number of turns required to tighten the shoulder nut when locking the clamping inclined block is as follows: When installing or removing the blade, select the gap between the bottom surface of the blade tenon and the clamping inclined surface, and calculate the number of turns required to tighten the shoulder nut according to the following formula:

[0063]

[0064] Where p is the pitch of the shoulder nut (32), n is the number of turns of the shoulder nut (32) when clamping, d is the design gap between the bottom surface of the tenon and the tightening slope (311) when inserting or removing the blade, and α is the angle of the tightening slope (311).

[0065] In a practical application case of this tooling for clamping a certain type of blade, the design clearance d = 0.3~0.5mm, a shoulder nut 32 with a pitch of 1.5mm is selected, and the angle α of the clamping inclined surface 311 of the clamping block 31 is selected within the range of 5.74°~9.59°. Therefore, the number of turns n for the shoulder nut 32 can be calculated to be 2. This angle α range and the number of turns n ensure that the blade tenon can be stably and effectively clamped, while avoiding clamping difficulties caused by excessively large angles or cumbersome operation and low efficiency caused by excessively small angles. Through this precise calculation, the tooling can maintain its stability and accuracy when clamping blades of different sizes, greatly improving processing efficiency and quality.

[0066] This invention clamps the tenon of the old blade using a clamping mechanism and tenon groove 21. The blade tip of the old blade is clamped by the blade back positioning block 51 and the blade basin positioning block 52, so that the standard curved surface 54 of the blade back positioning block 51 and the standard curved surface 54 of the blade basin positioning block 52 are simultaneously flush with the blade tip of the old blade, achieving precise positioning and clamping of the blade, restoring the assembly state of the blade in the rotor, transferring the blade tip size of the old blade to the replacement tooling, and then clamping the new blade onto the tooling, thus realizing the correlation between the blade tip sizes of the old and new blades. At this time, the part of the new blade tip that is higher than the standard curved surface 54 is the part that needs to be removed by machining, and it is easy to complete the blade tip machining of the new blade by manual clamping. Compared with the prior art, it realizes the replacement of machine tool machining, avoids clamping the rotor and machining the blade on the machine tool, and is suitable for blade tip machining when the number of blades is small, which can save costs and improve repair quality and efficiency.

[0067] The above are merely preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A tooling replacement for machining engine rotor blades during maintenance, characterized in that, include: Base (1); A tenon positioning seat (2) is fixed to the base (1). The tenon positioning seat (2) is provided with a tenon groove (21) for accommodating the tenon. A positioning surface (211) is provided in the tenon groove (21). The tenon positioning seat (2) is also provided with a clamping mechanism for clamping the tenon when holding the blade, forcing the pressure surface of the tenon to fit with the positioning surface (211). A stop block (22) is also provided at one end of the tenon groove (21). The stop block (22) is used to fit tightly against one end of the tenon when holding the blade. The leaf tip positioning mechanism includes a leaf back positioning block (51) and a leaf basin positioning block (52) that can be combined and clamped at the leaf tip. The positions of the leaf back positioning block (51) and the leaf basin positioning block (52) can be adjusted radially along the leaf. The top of the leaf back positioning block (51) and the top of the leaf basin positioning block (52) both have a standard curved surface (54), which is used to be flush with the leaf tip when clamping the leaf.

2. The replacement tooling for machining engine rotor blades for maintenance according to claim 1, characterized in that, The tenon positioning seat (2) is provided with a tightening groove (23), which is connected to the tenon groove (21); the tightening mechanism also includes a locking component and a tightening inclined block (31) with a tightening inclined surface (311), which is located in the tightening groove (23); the locking component is connected to the tightening inclined block (31) and is used to drive the tightening inclined block (31) to slide along the tightening groove (23) to tighten or release the tightening inclined block (31).

3. The replacement tooling for machining engine rotor blades for maintenance according to claim 2, characterized in that, The locking assembly includes a shoulder nut (32) and a screw (33); the screw (33) is fixed to the top clamping block (31), and the shoulder nut (32) is located outside the top clamping groove (23), and the shoulder nut (32) is threadedly connected to the screw (33).

4. The replacement tooling for machining engine rotor blades for maintenance according to claim 1, characterized in that, The leaf tip positioning mechanism also includes a support (4) slidably connected to the base (1). The leaf back positioning block (51) and the leaf basin positioning block (52) are respectively matched with a support (4) and connected to the support (4). The leaf back positioning block (51) and the leaf basin positioning block (52) can both slide along the support (4) to adjust their positions.

5. The replacement tooling for machining engine rotor blades for maintenance according to claim 4, characterized in that, Both the leaf back positioning block (51) and the leaf basin positioning block (52) are provided with guide protrusions (53), and the leaf back positioning block (51) and the leaf basin positioning block (52) are respectively provided with fixing bolts for fixing to the support (4); The support (4) is provided with a lifting groove (42) in a direction parallel to the radial direction of the blade, and a lifting waist-shaped hole (43) is provided in the lifting groove (42). The guide protrusion (53) slides in the lifting groove (42), and the fixing bolt passes through the lifting waist-shaped hole (43) and can slide in the lifting waist-shaped hole (43).

6. The replacement tooling for machining engine rotor blades for maintenance according to claim 4, characterized in that, The support (4) is provided with a transverse waist-shaped hole (41) for adjusting the transverse position of the support (4).

7. The replacement tooling for machining engine rotor blades for maintenance according to claim 4, characterized in that, At least one transverse guide block (6) is provided on each side of the support (4). The transverse guide block (6) is fixed to the base (1). The area between the transverse guide blocks (6) on both sides of the support (4) is defined as a transverse channel for the support (4) to slide.

8. A method for replacing machining of engine rotor blades for maintenance, characterized in that, The processing method comprises using the alternative tooling as described in any one of claims 1-7 to clamp new and old blades, wherein the tooling is used to clamp the blades. S1. Move the leaf back positioning block (51) and the leaf basin positioning block (52) in opposite directions by a preset distance; S2. Place the tenon of the old blade into the tenon groove (21) and use the clamping wedge (31) to clamp the tenon, forcing the pressure surface of the tenon to fit with the positioning surface (211); S3. Move the leaf back positioning block (51) and the leaf basin positioning block (52) toward each other until the leaf back positioning block (51) and the leaf basin positioning block (52) merge to clamp the leaf body; S4. Adjust the height of the leaf back positioning block (51) and the leaf basin positioning block (52) relative to the positioning surface (211) so that the standard curved surface (54) of both is flush with the tip of the old leaf at the same time, and then fix the height of the leaf back positioning block (51) and the leaf basin positioning block (52). S5. Move the leaf back positioning block (51) and the leaf basin positioning block (52) away from the old leaf in opposite directions, and remove the old leaf from the tenon groove (21). Then, place the tenon of the new leaf into the tenon groove (21) and use the clamping wedge block (31) to clamp the tenon, forcing the pressure surface of the tenon to fit with the positioning surface (211). S6. Move the leaf back positioning block (51) and the leaf basin positioning block (52) towards each other until the leaf back positioning block (51) and the leaf basin positioning block (52) merge and fit against the leaf body; S7. Remove the blade tip portion that is higher than the standard curved surface (54). After processing, take out the new blade and process the next blade.

9. The method for replacing machining of engine rotor blade assembly for maintenance according to claim 8, characterized in that, When tightening the top wedge block (31), the number of turns of the shoulder nut (32) is calculated as follows: When installing or removing the blade, select the gap between the bottom surface of the blade tenon and the tightening bevel (311), and calculate the number of turns of the shoulder nut (32) according to the following formula: Where p is the pitch of the shoulder nut (32), n is the number of turns of the shoulder nut (32) when clamping, d is the measured gap between the bottom surface of the tenon and the tightening inclined surface (311) when the blade is installed or removed, and α is the angle of the tightening inclined surface (311).

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