A polishing device for an aeroengine rotor

Abstract

The utility model discloses a kind of grinding devices for aero-engine rotor, including bottom plate, rotor assembly fixing mechanism being set on bottom plate and respectively located at impeller end polishing unit and turbine end polishing unit of the two sides of fixing mechanism. Impeller end polishing unit includes impeller end linear feed mechanism and impeller end polishing executor, and turbine end polishing unit includes turbine end linear feed mechanism and turbine end polishing executor. The linear feed mechanism is preferably precision screw rod sliding table, and polishing executor can be driven to move positioning accurately along rotor axial and radial direction. The utility model realizes quantitative, accurate polishing weight removal in specified position of rotor according to dynamic balance calculation result by simple mechanical structure, significantly improves the precision, efficiency and qualification rate of aero-engine rotor dynamic balance correction, reduces the dependence on operator skill.

Description

Technical Field

[0001] This utility model belongs to the field of aero-engine manufacturing and assembly technology, and specifically relates to a grinding device for aero-engine rotors. Background Technology

[0002] The rotor assembly is a critical core component of an aero-engine, and its dynamic balance performance directly determines the engine's vibration level, operational stability, and lifespan. At high speeds (tens of thousands or even hundreds of thousands of revolutions per minute), even minute imbalances can generate enormous centrifugal forces, leading to bearing overload, component fatigue, and even complete engine failure. Therefore, precise dynamic balancing testing and correction of the rotor assembly are essential during the assembly and manufacturing process of aero-engines.

[0003] Currently, one of the mainstream methods for dynamic balancing rotor assemblies involves removing a certain mass of material from specific locations on the rotor (such as turbine disks, impeller bosses, or tenon joints) after detecting the phase and magnitude of the imbalance. However, in existing technologies, this weight removal operation largely relies on operators using tools such as angle grinders and pneumatic polishing pens based on experience. This manual operation mode has many drawbacks: First, the positional accuracy of the grinding is difficult to guarantee, making it difficult to accurately align with the phase specified in the dynamic balancing analysis; second, the grinding depth and weight removal are difficult to control precisely, easily leading to insufficient weight removal (requiring re-grinding and reduced efficiency) or excessive weight removal (potentially causing rotor component scrapping and significant economic losses); third, this process is highly dependent on the skill level and experience of the operators, requiring long training cycles, and exhibiting poor consistency in work results among different operators; finally, manual operation is inefficient and has become one of the bottleneck processes in the high-precision, high-volume aero-engine manufacturing process. Utility Model Content

[0004] To address the aforementioned shortcomings of existing technologies, this utility model provides a grinding device for aero-engine rotors. Existing technologies for aero-engine rotor dynamic balance correction mainly rely on manual grinding, which suffers from difficulties in precision control, low efficiency, and high dependence on operator skills.

[0005] To achieve the above objectives, the technical solution adopted by this utility model is as follows: A grinding device for aircraft engine rotors is provided, comprising a base plate, a rotor assembly fixing mechanism, an impeller end grinding unit, and a turbine end grinding unit. The rotor assembly fixing mechanism is mounted on the base plate and is used to fix the rotor assembly to be polished. The impeller end grinding unit and the turbine end grinding unit are respectively disposed on both sides of the rotor assembly fixing mechanism and are both mounted on the base plate. The impeller end grinding unit includes an impeller end linear feed mechanism and an impeller end grinding actuator mounted thereon; the turbine end grinding unit includes a turbine end linear feed mechanism and a turbine end grinding actuator mounted thereon. The impeller end linear feed mechanism drives the impeller end grinding actuator to move radially along the rotor assembly; the turbine end linear feed mechanism drives the turbine end grinding actuator to move axially along the rotor assembly; the impeller end grinding actuator and the turbine end grinding actuator perform quantitative grinding on designated parts of the impeller end and turbine end of the rotor assembly.

[0006] The beneficial effects of the above technical solution are as follows: by setting impeller end grinding unit and turbine end grinding unit on the base plate, independent and precise quantitative grinding of impeller end and turbine end of rotor assembly can be achieved from different directions. The grinding position can be located based on dynamic balance calculation results, which can cover the grinding needs of key parts of rotor, avoid manual operation error, and improve the efficiency and quality of dynamic balance correction.

[0007] Furthermore, the rotor assembly fixing mechanism includes a fixing base body and a clamp disposed thereon for adapting to and clamping the central shaft section of the rotor assembly; the clamp includes a lower clamping body and an upper clamping body with a semi-circular cross-section, the lower clamping body is fixedly connected to the top of the fixing base body, the upper clamping body is located on top of the lower clamping body, and one side of the upper clamping body is hinged to one side of the lower clamping body via a hinge; an elastic pressure block is provided on the inner wall of the upper clamping body; a clamping device is provided on the other side of the upper and lower clamping bodies; the clamping device includes an upper clamping seat and a lower clamping seat, the upper clamping seat is fixedly disposed on the other side wall of the upper clamping body, and a clamping groove is provided on the front side of the upper clamping seat; the lower clamping seat is fixedly disposed on the other side wall of the lower clamping body, and a locking rod is hinged inside the lower clamping seat, the diameter of the locking rod is smaller than the groove width of the clamping groove, and a cam pressing handle is provided on the top of the locking rod, the cam end of the cam pressing handle is hinged to the top end of the locking rod.

[0008] The beneficial effects of the above technical solution are as follows: The fixture adopts a semi-circular lower clamping body and an upper clamping body, which are connected by a hinge to achieve opening and closing. An elastic pressure block is provided on the inner wall of the upper clamping body to provide cushioning. The clamping device achieves rapid locking through a locking rod and a cam-operated clamping handle. When the rotor assembly is placed on the lower clamping body, the upper clamping body closes, and the cam-operated clamping handle presses down the locking rod, causing it to engage in the clamping groove of the upper clamping seat, generating clamping force using the cam principle. The clamping device is simple and quick to operate, reducing workpiece clamping time; the elastic pressure block avoids damage to the rotor surface during clamping, adapts to rotor shaft sections of different diameters, and the clamping device has high reliability, ensuring rotor stability during grinding, thereby improving grinding accuracy and safety.

[0009] Furthermore, both the impeller end linear feed mechanism and the turbine end linear feed mechanism are screw-slide mechanisms; the screw-slide mechanism includes a slide base, a ball screw, a guide shaft, a movable slide, and a hand crank; the center of the hand crank is connected to the ball screw via a coupling, driving the movable slide to move linearly along the guide shaft; both the impeller end grinding actuator and the turbine end grinding actuator are mounted on the movable slide.

[0010] The beneficial effects of the above technical solution are as follows: the hand crank directly drives the ball screw to rotate through the coupling, which drives the moving slide to move linearly along the guide optical axis, thereby accurately controlling the position of the grinding actuator. The hand crank is intuitive to operate and easy to manually fine adjust. It has a simple structure, low manufacturing cost, and convenient maintenance. It is suitable for small and medium batch production or occasions that require flexible adjustment, thus reducing automation costs.

[0011] Furthermore, the upper surface of the movable slide is provided with a mounting base, and the upper surface of the mounting base is provided with a mounting groove with a semi-circular arc structure. The top of the mounting groove is detachably provided with a clamp, and the impeller end grinding actuator and the turbine end grinding actuator are fixedly installed in the mounting groove by the clamp.

[0012] The beneficial effects of the above technical solution are as follows: the shape of the mounting groove matches the housing of the grinding actuator, and the clamp is tightened by bolts or quick-release mechanism to ensure that the actuator is installed firmly. The clamp installation method is simple and reliable, allowing for quick replacement or adjustment of the grinding actuator, which improves the adaptability and maintainability of the device. The semi-circular mounting groove and the clamp provide uniform clamping force to prevent the actuator from loosening during vibration and ensure the stability of the grinding process.

[0013] Furthermore, the upper surface of the movable slide is provided with multiple mounting holes. Users can adjust the mounting base and the mounting positions of the impeller-end grinding actuator and turbine-end grinding actuator on it according to different rotor models or grinding requirements, increasing the flexibility and scalability of the entire grinding device; the mounting hole design facilitates customized modification, improves the versatility of the grinding device, and is suitable for multi-variety, small-batch production environments.

[0014] Furthermore, both the impeller end grinding actuator and the turbine end grinding actuator include a rotary motor installed in the mounting slot, and the output end of the rotary motor is connected to a grinding head through a clamping head.

[0015] The beneficial effects of the above technical solution are as follows: the clamping head design makes it easy to replace the grinding head, supports a variety of grinding tools, and adapts to different grinding requirements; the rotary motor provides a stable speed to ensure grinding quality.

[0016] This utility model provides a grinding device for aero-engine rotors, which has the following advantages: Through a dedicated rotor assembly fixing mechanism and a dual grinding unit design, high-precision, quantitative grinding of the rotor assembly is achieved. The fixing mechanism clamps quickly without damaging the rotor, the linear feed mechanisms at the impeller and turbine ends provide precise movement, the grinding actuators at the impeller and turbine ends are flexibly installed, and the overall structure is simple and reliable. This significantly improves the efficiency and pass rate of dynamic balance correction and reduces reliance on operator skills. Attached Figure Description

[0017] Figure 1 This is a three-dimensional structural diagram of a grinding device for aircraft engine rotors.

[0018] Figure 2 A three-dimensional structural diagram of the rotor assembly fixing mechanism.

[0019] Figure 3 This is a schematic diagram of the structure in which the rotor assembly is fixed in the fixture.

[0020] Figure 4 A schematic diagram of the structure in which the mounting base is set on the lead screw slide mechanism.

[0021] In the diagram, 1. Base plate; 2. Rotor assembly fixing mechanism; 3. Impeller end grinding unit; 4. Turbine end grinding unit; 5. Rotor assembly; 6. Impeller end linear feed mechanism; 7. Impeller end grinding actuator; 8. Turbine end linear feed mechanism; 9. Turbine end grinding actuator; 10. Fixed seat body; 11. Clamp; 12. Lower clamp body; 13. Upper clamp body; 14. Elastic pressure block; 15. Clamping device; 16. Upper clamping seat; 17. Lower clamping seat; 18. Clamping groove; 19. Locking rod; 20. Cam clamping handle; 21. Slide table base; 22. Ball screw; 23. Guide shaft; 24. Moving slide table; 25. Hand crank; 26. Coupling; 27. Mounting seat; 28. Mounting groove; 29. ​​Clamp. Detailed Implementation

[0022] The specific embodiments of this utility model are described below to enable those skilled in the art to understand this utility model. However, it should be understood that this utility model is not limited to the scope of the specific embodiments. For those skilled in the art, as long as various changes are within the spirit and scope of this utility model as defined and determined by the appended claims, these changes are obvious. All utility model creations utilizing the concept of this utility model are within the scope of protection.

[0023] like Figures 1-4As shown, this utility model provides a grinding device for aero-engine rotors, mainly including a base plate 1, a rotor assembly fixing mechanism 2, an impeller end grinding unit 3, and a turbine end grinding unit 4. The base plate 1 is made of cast iron or steel, possessing sufficient rigidity and flatness, serving as the foundation platform for the entire device. The rotor assembly fixing mechanism 2 is located in the middle of the base plate 1, used to fix the rotor assembly 5 to be ground. The impeller end grinding unit 3 and the turbine end grinding unit 4 are located on opposite axial sides of the rotor assembly fixing mechanism 2, and are mounted on the base plate 1 by bolts or guide rails, forming a symmetrical layout.

[0024] The rotor assembly fixing mechanism 2 includes a fixing base body 10 and a clamp 11. The fixing base body 10 is fixed to the base plate 1 by bolts, and the clamp 11 is connected to its top. The clamp 11 consists of a lower clamping body 12 and an upper clamping body 13, both of which have a semi-circular cross-section, forming a complete circular clamping cavity. The lower clamping body 12 is fixedly connected to the fixing base body 10, and one side of the upper clamping body 13 is hinged to one side of the lower clamping body 12, allowing the upper clamping body 13 to rotate and open around the hinge axis. An elastic pressure block 14, such as rubber or polyurethane material, is bonded to the inner wall of the upper clamping body 13 to cushion and protect the surface of the rotor assembly 5 during clamping.

[0025] A clamping device 15 is provided on the other side of the upper clamping body 13 and the lower clamping body 12. The clamping device 15 includes an upper clamping seat 16 and a lower clamping seat 17: the upper clamping seat 16 is fixed to the side wall of the upper clamping body 13, and its front side has a clamping groove 18; the lower clamping seat 17 is fixed to the side wall of the lower clamping body 12, and a locking rod 19 is hinged inside it. The diameter of the locking rod 19 is slightly smaller than the groove width of the clamping groove 18, allowing the locking rod 19 to pass freely. A cam clamping handle 20 is hinged to the top of the locking rod 19. When the upper clamping body 13 is closed, the operator presses down the cam clamping handle 20, and the locking rod 19 is pulled tight and locked into the clamping groove 18 through the cam principle, thereby generating a strong clamping force to fix the rotor assembly 5. This clamping mechanism is fast and reliable in operation and is suitable for rotor shaft sections of different diameters.

[0026] The impeller end grinding unit 3 includes an impeller end linear feed mechanism 6 and an impeller end grinding actuator 7. The turbine end grinding unit 4 includes a turbine end linear feed mechanism 8 and a turbine end grinding actuator 9. The impeller end linear feed mechanism 6 drives the impeller end grinding actuator 7 to move radially along the rotor assembly 5, while the turbine end linear feed mechanism 8 drives the turbine end grinding actuator 9 to move axially along the rotor assembly 5.

[0027] The linear feed mechanism is a screw-slide mechanism, including a slide base 21, a ball screw 22, a guide shaft 23, a movable slide 24, and a handwheel 25. The slide base 21 is fixed to the base plate 1 by bolts. The ball screw 22 and the guide shaft 23 are mounted parallel to each other on the slide base 21, and the movable slide 24 is sleeved on the ball screw 22 and the guide shaft 23. The handwheel 25 is connected to one end of the ball screw 22 through a coupling 26. Rotating the handwheel 25 drives the ball screw 22 to rotate, thereby driving the movable slide 24 to move linearly along the guide shaft 23. The upper surface of the movable slide 24 has multiple mounting holes for fixing the mounting base 27.

[0028] The upper surface of the mounting base 27 is provided with a semi-circular mounting groove 28. The top of the mounting groove 28 is fixed to the grinding actuator by a clamp 29. The clamp 29 is a two-part structure, which is fastened with bolts to firmly press the grinding actuator into the mounting groove 28. The grinding actuator includes a rotary motor, a clamping head, and a grinding head. The rotary motor is installed in the mounting groove 28, and its output end is connected to the grinding head through the clamping head, which is a spring collet or an ER collet; the grinding head is a grinding wheel or a milling cutter. After the rotary motor is powered on, it drives the grinding head to rotate at high speed to realize the grinding operation.

[0029] In use, first place the rotor assembly 5 on the lower clamping body 12 of the fixing mechanism, close the upper clamping body 13, and press down the cam clamping handle 20 to lock the rotor. Based on the dynamic balance test results, determine the grinding position and grinding amount at the impeller end and turbine end. The operator rotates the handwheel 25 to adjust the radial position of the impeller end grinding actuator 7 and the axial position of the turbine end grinding actuator 9, aligning the grinding head with the designated part on the rotor. Start the rotary motor; the grinding head rotates and performs quantitative grinding. During grinding, the position can be finely adjusted using the handwheel 25 to ensure weight removal accuracy. After grinding is complete, loosen the clamping device 15 and remove the rotor assembly 5.

[0030] In summary, this utility model provides a grinding device for aero-engine rotors. Through a dedicated rotor assembly fixing mechanism 2 and a dual grinding unit design, it achieves high-precision, quantitative grinding of the rotor assembly 5. The fixing mechanism clamps quickly without damaging the rotor, the impeller end and turbine end linear feed mechanism 8 provides precise movement, and the impeller end and turbine end grinding actuator 9 are flexibly installed. The overall structure is simple and reliable, significantly improving the efficiency and pass rate of dynamic balance correction and reducing reliance on operator skills.

Claims

1. A grinding device for aircraft engine rotors, characterized in that, This includes a base plate, a rotor assembly fixing mechanism, an impeller end grinding unit, and a turbine end grinding unit; The rotor assembly fixing mechanism is mounted on the base plate and is used to fix the rotor assembly to be polished. The impeller end grinding unit and the turbine end grinding unit are respectively disposed on both sides of the rotor assembly fixing mechanism and are both mounted on the base plate. The impeller end grinding unit includes an impeller end linear feed mechanism and an impeller end grinding actuator mounted thereon; the turbine end grinding unit includes a turbine end linear feed mechanism and a turbine end grinding actuator mounted thereon. The impeller end linear feed mechanism drives the impeller end grinding actuator to move radially along the rotor assembly; the turbine end linear feed mechanism drives the turbine end grinding actuator to move axially along the rotor assembly; the impeller end grinding actuator and the turbine end grinding actuator perform quantitative grinding on designated parts of the impeller end and turbine end of the rotor assembly.

2. The grinding apparatus for aero-engine rotors according to claim 1, characterized in that, The rotor assembly fixing mechanism includes a fixing base body and a clamp disposed thereon for fitting and clamping the central shaft section of the rotor assembly; the clamp includes a lower clamp body and an upper clamp body with a semi-circular cross-section. The lower clamp body is fixedly connected to the top of the fixing base body, and the upper clamp body is located on top of the lower clamp body. One side of the upper clamp body is hinged to one side of the lower clamp body via a hinge; an elastic pressure block is provided on the inner wall of the upper clamp body; a clamping device is provided on the other side of the upper and lower clamp bodies; the clamping device includes an upper clamping seat and a lower clamping seat. The upper clamping seat is fixedly disposed on the other side wall of the upper clamp body, and a clamping groove is provided on the front side of the upper clamping seat; the lower clamping seat is fixedly disposed on the other side wall of the lower clamp body, and a locking rod is hinged inside the lower clamping seat. The diameter of the locking rod is smaller than the width of the clamping groove, and a cam pressing handle is provided on the top of the locking rod. The cam end of the cam pressing handle is hinged to the top end of the locking rod.

3. The grinding apparatus for aero-engine rotors according to claim 1, characterized in that, Both the impeller end linear feed mechanism and the turbine end linear feed mechanism are screw-slide table mechanisms; the screw-slide table mechanism includes a slide table base, a ball screw, a guide optical shaft, a movable slide table, and a hand crank; the center of the hand crank is connected to the ball screw through a coupling, driving the movable slide table to move linearly along the guide optical shaft; the impeller end grinding actuator and the turbine end grinding actuator are both mounted on the movable slide table.

4. The grinding apparatus for aero-engine rotors according to claim 3, characterized in that, The upper surface of the movable slide is provided with a mounting base, and the upper surface of the mounting base is provided with a mounting groove with a semi-circular arc structure. The top of the mounting groove is detachably provided with a clamp, and the impeller end grinding actuator and the turbine end grinding actuator are fixedly installed in the mounting groove by the clamp.

5. The grinding apparatus for aero-engine rotors according to claim 4, characterized in that, The upper surface of the movable slide is provided with multiple mounting holes.

6. The grinding apparatus for aero-engine rotors according to claim 4, characterized in that, Both the impeller end grinding actuator and the turbine end grinding actuator include a rotary motor installed in the mounting slot, and the output end of the rotary motor is connected to a grinding head through a clamping head.

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