Automatic positioning tool for repairing stator blade of low-pressure compressor of CFM56 engine

Abstract

The utility model discloses a CFM56 engine low-pressure compressor stator blade repair automatic positioning tool, which comprises a support, a milling head seat fixed on the support, a lifting rod, a metal elastic sleeve and a hand wheel, a transmission mechanism is arranged in the milling head seat, the hand wheel is arranged on the side surface of the milling head seat and is in transmission connection with the transmission mechanism, and the lifting rod is connected with the lifting rod. The elastic sleeve is vertically arranged on the top face of the milling head seat, an open hole extending in the height direction of the elastic sleeve and penetrating through the upper end of the elastic sleeve is formed in the side wall of the elastic sleeve, the lower end of the lifting rod is in linkage with the transmission mechanism, and the upper end of the lifting rod penetrates through the elastic sleeve. And the upper end of the lifting rod is provided with an expansion part which is used for expanding the elastic sleeve to enable the elastic sleeve to be expanded in the reference mounting hole of the blade workpiece so as to position the blade workpiece. According to the utility model, the elastic sleeve is expanded through the expansion part, and the blade reference mounting hole is expanded by the elastic sleeve, so that the coaxiality of the blade reference mounting hole and the elastic sleeve is less than 0.05 mm, the blade is automatically positioned, the use is convenient during batch maintenance, and the working efficiency is improved.

Description

Technical Field

[0001] The utility model belongs to aviation mechanical processing technology, in particular to an automatic positioning tool for repairing stator blades of a low-pressure compressor of a CFM56 engine. Background Art

[0002] The stator assembly of the low-pressure compressor of the CFM56-7B turbofan engine is mainly composed of 76 full-ring outlet guide vanes, four-stage stator vane assembly and a casing containing the full-ring vanes. The 76 full-ring outlet guide vanes are an important part of the stator assembly. The main function of the stator assembly is to guide the flow and bear the force. The role of the outlet guide stator vanes is to improve the flow of the outer airflow after the fan and improve the working efficiency of the engine.

[0003] The outlet guide stator blades are composed of a hard aluminum alloy structure. When the aircraft flies in corrosive media such as moisture / salt spray and harsh environments, it will inevitably cause intergranular corrosion / stress corrosion and other damage to the root mounting surface and mounting holes of the aluminum alloy blades and wear of the load-bearing parts. If not repaired in time, it will eventually lead to corrosion fatigue and stress fracture around the root mounting surface and mounting holes of the blades, causing major catastrophic accidents.

[0004] When repairing the outlet guide stator blades, a positioning fixture is required. When the stator blades are processed using the existing tooling fixtures specifically for aircraft engine blade processing, the positioning effect is poor, and the flatness and coaxiality of each blade need to be adjusted, which makes the processing of each blade time-consuming. In addition, the number of stator blades repaired each time is very large, resulting in a long overall processing time. Utility Model Content

[0005] The utility model aims to provide a CFM56 engine low-pressure compressor stator blade repair automatic positioning tool which has simple structure, low cost, good positioning effect, is easy to use and can improve processing efficiency.

[0006] The purpose of the utility model is achieved through the following technical measures: an automatic positioning tool for repairing the stator blades of a low-pressure compressor of a CFM56 engine, characterized in that it includes a support, a milling head seat fixed on the support, a lifting rod, an elastic sleeve made of metal and a handwheel, a transmission mechanism is provided in the milling head seat, the handwheel is mounted on the side of the milling head seat and is connected to the transmission mechanism, the elastic sleeve is vertically arranged on the top surface of the milling head seat, and an opening extending along the height direction and passing through the upper end of the elastic sleeve is provided on the side wall of the elastic sleeve, the lower end of the lifting rod is linked to the transmission mechanism, and the upper end passes through the elastic sleeve, and an enlarged portion is provided at the upper end of the lifting rod for expanding the elastic sleeve so that it is expanded and tightened in the reference mounting hole of the blade workpiece to position the blade workpiece.

[0007] The lifting rod of the utility model can be driven by the transmission mechanism to move up and down when the operating hand wheel is rotated. When the lifting rod moves downward, the elastic sleeve is expanded by the expansion part, and the blade workpiece placed on the elastic sleeve has its blade reference mounting hole expanded by the elastic sleeve, so that the coaxiality of the blade reference mounting hole and the elastic sleeve is less than 0.05mm, which plays an automatic positioning role for the blade. Therefore, there is no need to manually align the blade workpiece. When performing batch maintenance, it is easy to use and the work efficiency can be improved by 200%. The utility model greatly improves the accuracy and stability of blade maintenance, and prolongs the service life of components, shortens the maintenance cycle, reduces maintenance costs, and can generate huge economic benefits.

[0008] In order to perform secondary fixation on the blade workpiece and further improve the positioning effect, the utility model provides a clamping mechanism for clamping the blade workpiece on the top surface of the milling head seat.

[0009] The clamping mechanism of the utility model includes a support rod, a pressure plate and a locking nut. The support rod is composed of two concentric cylinders with a smaller upper section and a larger lower section. The lower end of the lower cylinder is fixed to the top surface of the milling head seat, and the upper cylinder has an external thread. A step is formed at the intersection of the lower cylinder and the upper cylinder. One end of the pressure plate is fork-shaped and corresponds to the two sides of the reference mounting hole of the blade workpiece, and the other end is sleeved on the upper cylinder and limited by the step. The locking nut is installed on the upper cylinder to press the pressure plate onto the blade workpiece.

[0010] The transmission mechanism of the utility model comprises a worm and a worm wheel, the hand wheel is connected to the worm, the worm is meshed with the worm wheel, the center hole of the worm wheel is a threaded hole, the lifting rod adopts a screw rod, and the screw rod is threadedly matched with the center hole of the worm wheel.

[0011] The milling head seat of the utility model is a rectangular block, which has an installation cavity. The hand wheel and the worm are connected by an extended shaft of the handle extending into the installation cavity. The worm is located in the installation cavity and supported by a pair of deep groove ball bearings. Bearing end covers are installed at the outer ends of the pair of deep groove ball bearings. The side of the installation cavity is open, the worm wheel is located at the opening and a worm wheel end cover for installing the worm wheel is provided at the lower end of the opening, and a guide sleeve for providing guidance for the upward and downward movement of the screw rod is provided at the upper end of the opening, and the elastic sleeve is installed on the guide sleeve.

[0012] The elastic sleeve of the utility model is made of spring steel, specifically spring steel-65Mn, which is quenched and tempered to 50Rc, and other metal materials that meet the hardness requirements can also be used.

[0013] The utility model provides a plurality of openings along the circumference of the elastic sleeve.

[0014] The enlarged portion at the upper end of the screw rod of the utility model is an inverted cone head.

[0015] Compared with the prior art, the utility model has the following significant effects:

[0016] ⑴ The lifting rod of the utility model can be driven by the transmission mechanism to move up and down when the operating hand wheel is rotated. When the lifting rod moves downward, the elastic sleeve is expanded by the expansion part, and the blade reference mounting hole of the blade workpiece placed on the elastic sleeve will be expanded by the elastic sleeve, so that the coaxiality of the blade reference mounting hole and the elastic sleeve is less than 0.05mm, which plays an automatic positioning role for the blade. Therefore, there is no need to manually align the blade workpiece. When performing batch maintenance, it is easy to use and the work efficiency can be improved by 200%; the utility model greatly improves the accuracy and stability of blade maintenance, and prolongs the service life of components, shortens the maintenance cycle, reduces maintenance costs, and can generate huge economic benefits.

[0017] (2) After the utility model automatically positions the blade workpiece, the clamping structure is used to perform secondary fixation on the blade to further improve the positioning effect.

[0018] ⑶The utility model has the advantages of simple structure, low cost and strong practicability and is suitable for wide promotion and use. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The utility model is further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0020] Figure 1 It is the front view of the utility model;

[0021] Figure 2 is along Figure 1 Sectional view along the AA line;

[0022] Figure 3 yes Figure 2 Middle I is a partial enlarged schematic diagram;

[0023] Figure 4 is along Figure 1 mid-HH line section;

[0024] Figure 5 This is the front view of the milling head seat of the utility model;

[0025] Figure 6 is along Figure 5 Mid-DD line section;

[0026] Figure 7 It is one of the three-dimensional structural schematic diagrams of the utility model;

[0027] Figure 8 This is the second schematic diagram of the three-dimensional structure of the utility model.

[0028] In the figure: 1-locking nut, 2-pressure plate, 3-support rod, 4-milling head seat, 5-support; 6-blade workpiece, 7-worm gear end cover, 8-screw, 9-handwheel, 10-handle extension shaft, 11-worm, 12-worm gear, 13-deep groove ball bearing, 14-bearing end cover, 15-screw, 16-elastic sleeve, 17-opening, 18-guide sleeve. DETAILED DESCRIPTION

[0029] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0030] like Figures 1 to 8 As shown, it is a CFM56 engine low-pressure compressor stator blade repair automatic positioning tool of the utility model, including a columnar support 5, a milling head seat 4 fixed on the support 5 by screws 15, a lifting rod, a metal elastic sleeve 16 and a hand wheel 9. The support supports the entire tool. A transmission mechanism is provided in the milling head seat 4. The hand wheel 9 is installed on the side of the milling head seat 4 and is connected to the transmission mechanism. A vertical elastic sleeve 16 is provided on the top surface of the milling head seat 4. In this embodiment, the elastic sleeve 16 is made of spring steel -65Mn and tempered to 50Rc. An opening 17 extending along its height direction and penetrating its upper end is provided on the side wall of the elastic sleeve 16, and the opening 17 is arranged in multiples along the circumference of the elastic sleeve 16. The lower end of the lifting rod is linked to the transmission mechanism, and the upper end passes through the elastic sleeve 16. The outer side of the elastic sleeve 16 cooperates with the reference mounting hole of the blade workpiece 6. An enlarged part is provided at the upper end of the lifting rod for expanding the elastic sleeve 16 so that it is expanded and tightened in the reference mounting hole of the blade workpiece 6 to position the blade workpiece 6.

[0031] In this embodiment, the transmission mechanism includes a worm 11 and a worm wheel 12. The milling head seat 4 is a rectangular block having a mounting cavity. The hand wheel 9 and the worm 11 are connected by a handle extension shaft 10 extending into the mounting cavity. The worm 11 is located in the mounting cavity and supported by a pair of deep groove ball bearings 13. To prevent the worm from shifting, a bearing end cover 14 is installed at the outer end of the pair of deep groove ball bearings 13. The side of the mounting cavity is open, the worm wheel 12 is located at the opening, and a worm wheel end cover 7 for installing the worm wheel 12 is provided at the lower end of the opening, and the worm wheel end cover 7 can fix the position of the worm wheel. The worm 11 is meshed with the worm wheel 12, and the center hole of the worm wheel 12 is a threaded hole. The lifting rod adopts a screw 8, and the screw 8 is threadedly matched with the center hole of the worm wheel 12. A guide sleeve 18 for providing guidance for the screw 8 to move up and down is provided at the upper end of the opening of the mounting cavity, and the elastic sleeve 16 is fixed on the guide sleeve 18.

[0032] In order to prevent vibration during processing, which may cause displacement of the blade workpiece, a clamping mechanism for clamping the blade workpiece is provided on the top surface of the milling head seat 4, which can achieve a secondary fixing effect on the blade. In this embodiment, the clamping mechanism includes a support rod 3, a pressure plate 2 and a locking nut 1. The support rod 3 is composed of two concentric cylinders, one small on the top and one large on the bottom. The lower end of the lower cylinder is fixed on the top surface of the milling head seat 4. The upper cylinder has an external thread, and a step is formed at the junction of the lower cylinder and the upper cylinder. One end of the pressure plate 2 is fork-shaped and corresponds to the two sides of the reference mounting hole of the blade workpiece 6. The other end is sleeved on the upper cylinder and limited by the step. The locking nut 1 is installed on the upper cylinder to clamp the pressure plate 2 on the blade workpiece 6.

[0033] The working principle and process of the utility model are as follows: the blade workpiece 6 is placed on the elastic sleeve 16 on the milling head seat 4, and the hand wheel 9 is manually rotated. The hand wheel 9 drives the handle extension shaft 10 to rotate, and then drives the worm 11 to rotate. The worm 11 is meshed with the worm wheel 12. The rotation of the worm 11 drives the worm wheel 12 to rotate, and the lateral rotation of the worm 11 is converted into the horizontal rotation of the worm wheel 12. The rotation of the worm wheel 12 drives the thread inside the center hole of the worm wheel 12 to rotate. The thread inside the center hole of the worm wheel 12 cooperates with the screw 8. The rotation of the thread inside the center hole of the worm wheel 12 drives the screw 8 to move up and down. When the screw 8 moves downward, the inverted cone head on the screw 8 will expand the elastic sleeve 16. The elastic sleeve 16 is expanded to vertically expand the blade reference mounting hole, so that the coaxiality of the reference mounting hole of the blade workpiece 6 and the elastic sleeve 16 on the milling head seat 4 is less than 0.05mm, so that the blade workpiece 6 achieves an automatic positioning effect. The clamping mechanism is then used to fix the blade workpiece 6 for a second time.

[0034] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. An automatic positioning tool for repairing stator blades of a CFM56 engine low-pressure compressor, characterized in that: It includes a support, a milling head seat fixed on the support, a lifting rod, an elastic sleeve made of metal and a handwheel. A transmission mechanism is arranged in the milling head seat. The handwheel is installed on the side of the milling head seat and is connected to the transmission mechanism. The elastic sleeve is vertically arranged on the top surface of the milling head seat. An opening extending along the height direction and passing through the upper end of the elastic sleeve is arranged on the side wall of the elastic sleeve. The lower end of the lifting rod is linked to the transmission mechanism, and the upper end passes through the elastic sleeve. An enlarged part is arranged at the upper end of the lifting rod for expanding the elastic sleeve so that it is expanded and tightened in the reference mounting hole of the blade workpiece to position the blade workpiece.

2. The CFM56 engine low-pressure compressor stator blade repair automatic positioning tool according to claim 1 is characterized by: A clamping mechanism for clamping the blade workpiece is arranged on the top surface of the milling head seat.

3. The CFM56 engine low-pressure compressor stator blade repair automatic positioning tool according to claim 2 is characterized by: The clamping mechanism includes a support rod, a pressure plate and a locking nut. The support rod is composed of two concentric cylinders with a smaller upper section and a larger lower section. The lower end of the lower cylinder is fixed to the top surface of the milling head seat. The upper cylinder has an external thread. A step is formed at the junction of the lower cylinder and the upper cylinder. One end of the pressure plate is fork-shaped and corresponds to the two sides of the reference mounting hole of the blade workpiece, and the other end is sleeved on the upper cylinder and limited by the step. The locking nut is installed on the upper cylinder to press the pressure plate onto the blade workpiece.

4. The CFM56 engine low-pressure compressor stator blade repair automatic positioning tool according to claim 3 is characterized by: The transmission mechanism includes a worm and a worm wheel. The hand wheel is connected to the worm, the worm is meshed with the worm wheel, the center hole of the worm wheel is a threaded hole, and the lifting rod is a lead screw, which is threadedly matched with the center hole of the worm wheel.

5. The CFM56 engine low-pressure compressor stator blade repair automatic positioning tool according to claim 4 is characterized by: The milling head seat is a rectangular block having an installation cavity. The handwheel and the worm are connected by an extension shaft of the handle extending into the installation cavity. The worm is located in the installation cavity and supported by a pair of deep groove ball bearings. Bearing end covers are installed at the outer ends of the pair of deep groove ball bearings. The side of the installation cavity is open. The worm wheel is located at the opening and a worm wheel end cover for installing the worm wheel is provided at the lower end of the opening. A guide sleeve for providing guidance for the up and down movement of the screw is provided at the upper end of the opening, and the elastic sleeve is fixed on the guide sleeve.

6. The CFM56 engine low-pressure compressor stator blade repair automatic positioning tool according to claim 5, characterized in that: The elastic sleeve is made of spring steel.

7. The CFM56 engine low-pressure compressor stator blade repair automatic positioning tool according to claim 6, characterized in that: The openings are arranged in plurality along the circumference of the elastic sleeve.

8. The CFM56 engine low-pressure compressor stator blade repair automatic positioning tool according to claim 7, characterized in that: The enlarged portion at the upper end of the screw rod is an inverted cone head.

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