Adaptive clamping fixture and clamping method for fan blades of an aeroengine

Abstract

This invention relates to the field of CNC machining of blades, and more particularly to an adaptive blade tip clamping fixture and method for machining aero-engine blades. The device includes a fixture base plate, a tenon positioning module, a blade tip contouring top plate positioning module, and a blade tip contouring pressure plate positioning module. In use, the blade tenon is first clamped using the blade tenon for positioning, and then the blade tip contouring pressure plate and blade tip contouring top plate are adjusted synchronously to achieve stress-free adaptive clamping of the blade tip. This solves the problem of blade deformation caused by the blade tip position deviation due to tenon positioning error and blade stress deformation after positioning with the blade tenon, which is then addressed by the blade tip auxiliary clamping. This device can improve the rigidity of the machining system without introducing clamping stress, achieving stress-free adaptive clamping of the blade tip. The device has a simple structure, is easy to operate, and provides reliable clamping force, offering strong support for precision blade machining.

Description

Technical Field

[0001] This invention relates to the field of CNC machining of blades, and more particularly to a clamping device and method for machining aero-engine fan blades. Background Technology

[0002] As a core component of aero-engines, the shape and manufacturing precision of fan blades directly affect the propulsion efficiency of the engine. Aero-engine blade manufacturing is characterized by thin-walled structures, complex free-form surfaces, and features such as bending, twisting, and sweeping shapes, along with high precision requirements. These characteristics place extremely high demands on blade clamping during machining. During machining, fixtures are needed to ensure the blade is in the correct position and clamped securely, preventing positional changes and workpiece deformation caused by clamping loosening due to cutting forces and vibrations. Existing blade machining fixtures come in many types, including general-purpose fixtures, adjustable fixtures, and combination fixtures. They typically use a tenon to fix one end, directly clamping and supporting the blade tip at its theoretical position and shape. This introduces clamping deformation and stress. After machining, releasing the clamping device causes the blade to deform again, resulting in a discrepancy between the shape accuracy after clamping and the shape accuracy during machining. This significantly reduces product quality. To eliminate this type of blade clamping error, it is necessary to find a way to clamp the blades according to their actual condition without causing deformation. Summary of the Invention

[0003] The purpose of this invention is to overcome the shortcomings of the prior art and provide an adaptive clamping fixture and clamping method for aero-engine fan blades that can be clamped according to the actual position of the blade when the blade is positioned by the tenon root, by using a contour-following contact clamping device, overcoming the clamping stress caused by the slight deviation of the blade tip position due to blade deformation and tenon root positioning error, and achieving adaptive clamping of the blade tip.

[0004] To achieve the above objectives, the technical solution adopted by the present invention is as follows: an adaptive clamping fixture for aero-engine fan blades, including a fixture base plate, a tenon positioning clamping device for positioning and clamping the tenon of the fan blade is installed on the fixture base plate, and a blade tip adaptive positioning device for clamping the blade tip is provided on the base on the side corresponding to the tenon positioning clamping device.

[0005] The blade tip adaptive positioning device includes a contoured top plate and a propulsion sliding pressing device for driving the contoured top plate to move up and down, and the contoured top plate is rotatably mounted on the propulsion sliding pressing device.

[0006] It also includes a contouring pressure plate, which is set above the contouring top plate in cooperation with a pressure plate support device, and the contouring pressure plate is rotatably mounted on the pressure plate support device;

[0007] The shape of the contoured top plate and the contoured pressure plate at the contact point with the blade tip is matched with the blade shape at the blade tip, so that the contoured top plate and the contoured pressure plate fit against the blade tip respectively. Through the mutual adaptation and cooperation of the contoured top plate and the contoured pressure plate, stress-free clamping of the fan blade tip is achieved.

[0008] Furthermore, the tenon positioning clamping device includes a rectangular column-shaped support base inclinedly disposed on the fixture base plate, and a sliding block is mounted on the inclined mounting surface of the support base facing the fixture base plate via a pair of sliding shafts. Bolt holes are provided on the sliding block and the support base respectively, and a sliding block bolt for controlling the position of the sliding block is installed in the bolt holes.

[0009] A fixing block is provided on the support base facing the fan blade tenon. Adjust the sliding block bolt so that the side of the sliding block facing the fan blade tenon cooperates with the fixing block to form a clamp for clamping the fan blade tenon.

[0010] A positioning pin is provided on the support base near the clamp base and between the clamps to position the fan blade tenon in the clamp.

[0011] Furthermore, the sliding block bolt passes through the positioning washer and the support base in sequence and is connected to the sliding block; the inclination angle between the support base and the fixture base plate is 60-65 degrees.

[0012] Furthermore, the fixing block is mounted on the support base by at least two positioning bolts; the support base is fixedly connected to the clamp base plate by a fixing base plate and base plate bolts.

[0013] Furthermore, the pushing sliding pressing device includes a sliding box mounted on the fixture base plate, and a sliding cavity with a wedge-shaped top block is provided in the sliding box. One side of the first wedge-shaped surface on the wedge-shaped top block enters the sliding cavity through a first mounting hole, and the first mounting hole is located at the top of the sliding box.

[0014] It also includes a wedge block for pushing the wedge top block to slide along the first wedge surface. The wedge block is provided with a second wedge surface that matches the wedge top block. One side of the second wedge surface of the wedge block enters the sliding cavity through a second mounting hole, and the second mounting hole is provided on the sliding box corresponding to the first wedge surface.

[0015] The contoured top plate is mounted on the wedge-shaped top block via a support block, and the contoured top plate is rotatably hinged to the wedge-shaped top block via a top plate pin.

[0016] Furthermore, the wedge block is rectangular prism-shaped, with an adjustment hole and a second wedge surface extending sequentially along its length. A first fastening bolt for fixing the wedge block passes through the adjustment hole and is fixed to the fixture base plate. By adjusting the position of the first fastening bolt within the adjustment hole, the degree to which the wedge surface of the wedge block extends into the sliding cavity is adjusted, thereby allowing the wedge top block to move up and down, achieving the tightening and loosening of the contouring top plate and the contouring pressure plate.

[0017] Furthermore, the sliding box is fixedly mounted on the fixture base plate by a second fastening bolt.

[0018] Furthermore, the pressure plate support device includes a pressure plate base, and the contoured pressure plate is mounted on the pressure plate base via a connecting rod. One end of the connecting rod is mounted on the pressure plate base, and the contoured pressure plate is mounted on the other end of the connecting rod. The connecting rod is used to make the contoured pressure plate correspond to the position of the contoured top plate.

[0019] Meanwhile, the connecting rod at the installation location of the contour plate is provided with a plate mounting hole for accommodating the contour plate. The contour plate is movably hinged in the plate mounting hole through a plate pin, thereby realizing the adaptive tightening and loosening of the contour plate in accordance with the contour plate.

[0020] Furthermore, the pressure plate base is provided with a mounting groove for mounting the connecting rod, and the end of the connecting rod is hinged in the mounting groove by a connecting rod bolt; at the same time, a clamping bolt is also provided on the connecting rod, passing through the connecting rod and connected in the mounting groove.

[0021] The pressure plate base is fixed to the fixture base plate by a third fastening bolt.

[0022] The present invention also provides a method for clamping the aforementioned fixture onto a fan blade for an aero-engine, comprising the following clamping steps:

[0023] Steps for distributing assembly fixtures:

[0024] First, install the assembled tenon positioning clamping device on the fixture base plate using the support base, fixed base plate, and base plate bolts;

[0025] Then, install the pushing and sliding pressing device on the clamp base plate on the corresponding side of the tenon positioning and clamping device, and fix it with the second fastening bolt; then install the contoured top plate on the wedge-shaped top block of the pushing and sliding pressing device through the support block and the top plate pin;

[0026] At the same time, the pressure plate support device is used to movably set the contour pressure plate above the contour top plate through the pressure plate mounting hole and pressure plate pin;

[0027] Finally, the sliding top pressing device and the pressure plate support device are fixed to the fixture base plate by the second and third fastening bolts, respectively.

[0028] Fan blade clamping steps:

[0029] First, fix the fixture base plate to the machine tool worktable;

[0030] Then, the blade is inserted into the clamp between the sliding block and the fixed block with the tenon, and positioned by the positioning pin. The sliding block bolt is adjusted, and the sliding block is pulled to move so that the clamping surfaces of the tenon positioning sliding block and the tenon positioning fixed block are in contact with the blade tenon, thereby achieving the purpose of positioning with the tenon.

[0031] Next, by moving the wedge block in the sliding top pressing device back and forth, the wedge block and the wedge top block contact the inclined surface in the sliding cavity of the sliding box, so that the wedge top block pushes the contour top plate to move up and down. Then, by finely adjusting the blade tip contour top plate to twist on the support block, the contour top plate and the blade are fitted together.

[0032] Simultaneously, during the process of adjusting the clamping bolt and tightening the connecting rod with a torque wrench, the contour plate rotates around the pressure plate pin in the pressure plate mounting hole, achieving the purpose of fitting the contour plate with the blade. Together with the contour top plate, it achieves stress-free adaptive clamping of the blade while ensuring that the parts do not deform. It also ensures that the blade is free from the risk of chatter and deformation caused by changes in dynamic milling force when machining the blade tip.

[0033] The beneficial effects of this invention are as follows: This invention proposes an adaptive clamping device and method for aero-engine blade tips. The clamping fixture's tip-contouring positioning top plate and tip-contouring pressure plate are manufactured according to the blade profile. The tip-contouring positioning top plate and tip-contouring pressure plate rotate around a pin on a wedge block and a tip-contouring connecting rod, respectively. The tip-contouring positioning top plate and tip-contouring pressure plate can achieve contact with the blade area through movement and rotation without deformation of the blade, thus realizing adaptive clamping of the blade tip. This device avoids blade deformation and uneven contact stress concentration during the clamping process, preventing blade deformation and impacting surface quality. This is of great significance for the efficient and high-quality production of aero-engine blades. Attached Figure Description

[0034] Figure 1 This is a schematic diagram of the overall structure of the present invention;

[0035] Figure 2 This is an exploded structural diagram of the tenon positioning and clamping device of the present invention;

[0036] Figure 3 This is an exploded structural diagram of the conformal top plate and the sliding pressing device of the present invention;

[0037] Figure 4 This is an exploded structural diagram of the conformal pressure plate and pressure plate support device of the present invention;

[0038] Figure 5 This is a schematic diagram of the exploded structure of the present invention.

[0039] In the diagram: 1. Fixture base plate; 2. Tenon positioning and clamping device; 2-1. Support base; 2-2. Sliding block; 2-3. Fixing block; 2-4. Sliding block bolt; 2-5. Positioning washer; 2-6. Positioning bolt; 2-7. Base plate bolt; 2-8. Positioning pin; 2-9. Fixing base plate; 2-10. Sliding shaft; 3. Pushing and sliding pressing device; 3-1. Wedge block; 3-2. First fastening bolt; 3-3. Support block; 3-4. Top plate pin; 3-5. Wedge-shaped top block; 3-6. Sliding... Box, 3-7. First mounting hole, 3-8. Second mounting hole, 3-9. First wedge surface, 3-10. Second wedge surface, 3-11. Adjustment hole, 3-12. Second fastening bolt, 4. Pressure plate support device, 4-1. Blade tip contouring pressure plate, 4-2. Pressure plate pin, 4-3. Clamping bolt, 4-4. Connecting rod, 4-5. Connecting rod bolt, 4-6. Pressure plate base, 4-7. Third fastening bolt, 4-8. Pressure plate mounting hole, 4-9. Mounting groove, 5. Contour top plate, 6. Contour pressure plate. Detailed Implementation

[0040] The principles and features of the present invention are described below with reference to the accompanying drawings. The examples given are only for explaining the present invention and are not intended to limit the scope of the present invention.

[0041] To achieve the above objectives, the present invention provides the following specific embodiments:

[0042] Example 1: As Figure 1-5 As shown, an adaptive clamping fixture for aero-engine fan blades includes a fixture base plate 1, a tenon positioning clamping device 2 for positioning and clamping the tenon of the fan blade is installed on the fixture base plate 1, and a blade tip adaptive positioning device for clamping the blade tip is provided on the base 1 on the side corresponding to the tenon positioning clamping device 2.

[0043] like Figure 1 As shown, the blade tip adaptive positioning device includes a contoured top plate 5 and a propulsion sliding pressing device 3 for driving the contoured top plate 5 to move up and down, and the contoured top plate 5 is rotatably mounted on the propulsion sliding pressing device 3.

[0044] It also includes a contouring pressure plate 6, which is set above the contouring top plate 5 in cooperation with the pressure plate support device 4, and the contouring pressure plate 6 is rotatably mounted on the pressure plate support device 4.

[0045] The shapes of the contoured top plate 5 and the contoured pressure plate 6 at the contact points with the blade tip are matched with the blade shape at the blade tip, so that the contoured top plate 5 and the contoured pressure plate 6 respectively fit against the blade tip. Through the mutual adaptation and cooperation of the contoured top plate 5 and the contoured pressure plate 6, stress-free clamping of the fan blade tip is achieved.

[0046] like Figure 2 As shown, the tenon positioning clamping device 2 includes a rectangular column-shaped support base 2-1 that is inclinedly set on the clamp base plate 1. The sliding block 2-2 is mounted on the inclined mounting surface of the support base 2-1 facing the clamp base plate 1 through a pair of sliding shafts 2-10. Bolt holes are provided on the sliding block 2-2 and the support base 2-1 respectively. The sliding block bolt 2-4 for controlling the position of the sliding block 2-2 is installed in the bolt holes.

[0047] A fixing block 2-3 is provided on the support base 2-1 facing the fan blade tenon. The sliding block bolt 2-4 is adjusted so that the side of the sliding block 2-2 facing the fan blade tenon cooperates with the fixing block 2-3 to form a clamping mouth for clamping the fan blade tenon. The sliding block bolt 2-4 passes through the positioning washer 2-5, the support base 2-1 and the sliding block 2-2 in sequence. The inclination angle between the support base 2-1 and the fixture base plate 1 is 60-65 degrees. The fixing block 2-3 is installed on the support base 2-1 by at least two positioning bolts 2-6. The support base 2-1 is fixedly connected to the fixture base plate 1 by the fixing base plate 2-9 and the base plate bolt 2-7.

[0048] A positioning pin 2-8 is provided on the support base 2-1 near the clamp base 1 and between the clamps, for positioning the fan blade tenon in the clamp.

[0049] like Figure 3 , Figure 5 As shown, the sliding pressing device 3 includes a sliding box 3-6 mounted on the fixture base plate 1. A sliding cavity for a wedge-shaped top block 3-5 is provided in the sliding box 3-6. One side of the first wedge-shaped surface 3-9 provided on the wedge-shaped top block 3-5 enters the sliding cavity through the first mounting hole 3-7, and the first mounting hole 3-7 is located at the top of the sliding box 3-6.

[0050] It also includes a wedge block 3-1 for pushing the wedge top block 3-5 to slide along the first wedge surface 3-9. The wedge block 3-1 is provided with a second wedge surface 3-10 that matches the wedge top block 3-5. One side of the second wedge surface 3-10 of the wedge block 3-1 enters the sliding cavity through the second mounting hole 3-8, and the second mounting hole 3-8 is provided on the sliding box 3-6 corresponding to the first wedge surface 3-9.

[0051] The contoured top plate 5 is mounted on the wedge-shaped top block 3-5 via the support block 3-3, and the contoured top plate 5 is rotatably hinged to the wedge-shaped top block 3-5 via the top plate pin 3-4;

[0052] The wedge block 3-1 is rectangular prism in shape. An adjustment hole 3-11 and a second wedge surface 3-10 are provided along the length of the wedge block 3-1. The first fastening bolt 3-2 for fixing the wedge block 3-1 passes through the adjustment hole 3-11 and is fixed to the fixture base plate 1. By adjusting the position of the first fastening bolt 3-2 in the adjustment hole 3-11, the degree to which the wedge surface of the wedge block 3-1 extends into the sliding cavity is adjusted, thereby allowing the wedge top block 3-5 to move up and down, so as to realize the tightening and loosening of the contour top plate 5 and the contour pressure plate 6.

[0053] The sliding box 3-6 is fixedly installed on the fixture base plate 1 by the second fastening bolt 3-12.

[0054] like Figure 4 , Figure 5 As shown, the pressure plate support device 4 includes a pressure plate base 4-6, and a contoured pressure plate 6 is mounted on the pressure plate base 4-6 via a connecting rod 4-4. One end of the connecting rod 4-4 is mounted on the pressure plate base 4-6, and the contoured pressure plate 6 is mounted on the other end of the connecting rod 4-4. The connecting rod 4-4 is used to make the contoured pressure plate 6 correspond to the position of the contoured top plate 5.

[0055] Meanwhile, the connecting rod 4-4 at the installation location of the contouring pressure plate 6 is provided with a pressure plate mounting hole 4-8 for accommodating the contouring pressure plate 6. The contouring pressure plate 6 is movably hinged in the pressure plate mounting hole 4-8 through the pressure plate pin 4-2, thereby realizing the adaptive cooperation of the contouring pressure plate 6 with the contouring top plate 5 to tighten and loosen.

[0056] The pressure plate base 4-6 is provided with a mounting groove 4-9 for mounting the connecting rod 4-4. The end of the connecting rod 4-4 is hinged in the mounting groove 4-9 by a connecting rod bolt 4-5. At the same time, a clamping bolt 4-3 is also provided on the connecting rod 4-4, which passes through the connecting rod 4-4 and is connected in the mounting groove 4-9.

[0057] The pressure plate base 4-6 is fixed to the fixture base plate 1 by the third fastening bolt 4-7.

[0058] When in use, after assembling the adaptive blade tip adaptive clamping fixture, fix the fixture base plate 1 to the machine tool worktable, position the blade with the tenon root, adjust the sliding block bolt 2-4, and pull the sliding block 2-2 to move so that the clamping surfaces of the sliding block 2-2 and the fixed block 2-3 fit with the blade tenon root, thereby achieving the purpose of positioning with the tenon root.

[0059] Due to the deformation of parts and the positioning error of the tenon root, there is a positional deviation in the blade tip position. In the propulsion sliding top pressing device 3, by moving the wedge block 3-1 back and forth, the wedge block 3-1 and the wedge top block 3-5 are in contact on the inclined surface, causing the wedge top block 3-5 and the contour plate 5 to move up and down. Then, by finely adjusting the twist of the contour plate 5, the contour plate 5 is brought into contact with the blade. In the pressure plate support device 4, when the torque wrench is used to adjust the clamping bolt 4-3 to tighten the connecting rod 4-4, the blade tip contour plate 4-1 can rotate around the pressure plate pin 4-2, achieving the contact between the blade tip contour plate 4-1 and the blade, realizing stress-free adaptive clamping of the blade by the fixture.

[0060] The blade of this invention is positioned by tenon, and the blade tip is pressed up and pushed down to ensure that the blade does not deform. This effectively protects the blade from the risk of chatter and deformation caused by changes in dynamic milling force during the machining of the blade tip.

[0061] Example 2: Same as Example 1, except that the inclination angle between the support base 2-1 and the clamp base plate 1 is 63 degrees.

[0062] Example 3: The present invention also provides a method for clamping the aforementioned fixture onto a fan blade for an aero-engine, comprising the following clamping steps:

[0063] Steps for distributing assembly fixtures:

[0064] First, install the assembled tenon positioning clamping device 2 onto the clamp base plate 1 via the support base 2-1, the fixed base plate 2-9 and the base plate bolts 2-7;

[0065] Then, the sliding top pressing device 3 is installed on the clamp base plate 1 on the corresponding side of the tenon positioning clamping device 2 and fixed by the second fastening bolt 3-12; then the contour top plate 5 is installed on the wedge-shaped top block 3-5 of the sliding top pressing device 3 by the support block 3-3 and the top plate pin 3-4;

[0066] At the same time, the pressure plate support device 4 is used to movably set the contour pressure plate 6 above the contour top plate 5 through the pressure plate mounting hole 4-8 and the pressure plate pin 4-2;

[0067] Finally, the sliding top pressing device 3 and the pressure plate support device 4 are fixed to the fixture base plate 1 by the second fastening bolt 3-12 and the third fastening bolt 4-7 respectively;

[0068] Fan blade clamping steps:

[0069] First, fix the fixture base plate 1 to the machine tool worktable;

[0070] Then, the blade is inserted into the clamp between the sliding block 2-2 and the fixed block 2-3 with the tenon, and positioned by the positioning pin 2-8. The sliding block bolt 2-4 is adjusted to pull the sliding block 2-2 to move, so that the clamping surfaces of the tenon positioning sliding block 2-2 and the tenon positioning fixed block 2-3 are in contact with the blade tenon, thereby achieving the purpose of positioning with the tenon.

[0071] Next, by moving the wedge block 3-1 in the sliding top pressing device 3 back and forth, the wedge block 3-1 and the wedge top block 3-5 come into contact with each other on the inclined surface in the sliding cavity of the sliding box 3-6, so that the wedge top block 3-5 pushes the contour plate 5 to move up and down. Then, by finely adjusting the blade tip contour plate 5 to twist on the support block 3-3, the contour plate 5 and the blade are brought into contact.

[0072] Simultaneously, during the process of adjusting the clamping bolt 4-3 to tighten the connecting rod 4-4 using a torque wrench, the contour plate 6 rotates around the clamping pin 4-2 within the clamping plate mounting hole 4-8, achieving the purpose of fitting the contour plate 6 with the blade. In conjunction with the contour plate 5, it achieves stress-free adaptive clamping of the blade while ensuring that the part does not deform. It also ensures that the blade is free from the risk of chatter and deformation caused by changes in dynamic milling force when machining the blade tip.

[0073] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. An adaptive clamping fixture for fan blades of an aero-engine, characterized in that, Includes a clamp base plate (1), on which a tenon positioning clamping device (2) for positioning and clamping the tenon of the fan blade is installed, and on the clamp base plate (1) on the side corresponding to the tenon positioning clamping device (2), a blade tip adaptive positioning device for clamping the blade tip of the fan blade is provided. The blade tip adaptive positioning device includes a contoured top plate (5) and a propulsion sliding pressing device (3) for driving the contoured top plate (5) to move up and down, and the contoured top plate (5) is rotatably mounted on the propulsion sliding pressing device (3); It also includes a contouring pressure plate (6), which is set above the contouring top plate (5) in cooperation with the pressure plate support device (4), and the contouring pressure plate (6) is rotatably mounted on the pressure plate support device (4); The shape of the contoured top plate (5) and the contoured pressure plate (6) at the contact point with the blade tip is matched with the blade shape at the blade tip, so that the contoured top plate (5) and the contoured pressure plate (6) are respectively attached to the blade tip. Through the mutual adaptation and cooperation of the contoured top plate (5) and the contoured pressure plate (6), the stress-free clamping of the fan blade tip is achieved. The aforementioned sliding pressing device (3) includes a sliding box (3-6) mounted on the fixture base plate (1). The sliding box (3-6) has a sliding cavity with a wedge-shaped top block (3-5). One side of the first wedge-shaped surface (3-9) on the wedge-shaped top block (3-5) enters the sliding cavity through the first mounting hole (3-7), and the first mounting hole (3-7) is located at the top of the sliding box (3-6). It also includes a wedge block (3-1) for pushing the wedge top block (3-5) to slide along the first wedge surface (3-9). The wedge block (3-1) is provided with a second wedge surface (3-10) that matches the wedge top block (3-5). One side of the second wedge surface (3-10) of the wedge block (3-1) enters the sliding cavity through the second mounting hole (3-8), and the second mounting hole (3-8) is provided on the sliding box (3-6) corresponding to the first wedge surface (3-9). The contoured top plate (5) is mounted on the wedge-shaped top block (3-5) by a support block (3-3), and the contoured top plate (5) is rotatably hinged to the wedge-shaped top block (3-5) by a top plate pin (3-4); The wedge block (3-1) is rectangular prism-shaped. An adjustment hole (3-11) and a second wedge surface (3-10) are provided in sequence along the length direction of the wedge block (3-1). The first fastening bolt (3-2) for fixing the wedge block (3-1) passes through the adjustment hole (3-11) and is fixed to the fixture base plate (1). By setting the position of the first fastening bolt (3-2) in the adjustment hole (3-11), the degree to which the wedge surface of the wedge block (3-1) extends into the sliding cavity is adjusted, thereby allowing the wedge top block (3-5) to move up and down, so as to realize the tightening and loosening cooperation between the contour top plate (5) and the contour pressure plate (6). The pressure plate support device (4) includes a pressure plate base (4-6), and the contoured pressure plate (6) is mounted on the pressure plate base (4-6) via a connecting rod (4-4). One end of the connecting rod (4-4) is mounted on the pressure plate base (4-6), and the contoured pressure plate (6) is mounted on the other end of the connecting rod (4-4). The connecting rod (4-4) is used to make the contoured pressure plate (6) correspond to the position of the contoured top plate (5). Meanwhile, a pressure plate mounting hole (4-8) for accommodating the contour pressure plate (6) is provided on the connecting rod (4-4) at the installation location of the contour pressure plate (6). The contour pressure plate (6) is movably hinged in the pressure plate mounting hole (4-8) through the pressure plate pin (4-2), thereby realizing the adaptive tightening and loosening of the contour pressure plate (6) in conjunction with the contour top plate (5).

2. The adaptive clamping fixture for aero-engine fan blades as described in claim 1, characterized in that, The tenon positioning clamping device (2) includes a rectangular column-shaped support base (2-1) inclinedly arranged on the clamp base plate (1). A sliding block (2-2) is mounted on the inclined mounting surface of the support base (2-1) facing the clamp base plate (1) via a pair of sliding shafts (2-10). Bolt holes are provided on the sliding block (2-2) and the support base (2-1) respectively. A sliding block bolt (2-4) for controlling the position of the sliding block (2-2) is installed in the bolt holes. A fixing block (2-3) is provided on the support base (2-1) facing the fan blade tenon. Adjust the sliding block bolt (2-4) so ​​that the side of the sliding block (2-2) facing the fan blade tenon cooperates with the fixing block (2-3) to form a clamp for clamping the fan blade tenon. On the side near the base plate (1) of the clamp, and on the support base (2-1) between the clamps, there is a positioning pin (2-8) for positioning the fan blade tenon in the clamp.

3. The adaptive clamping fixture for aero-engine fan blades as described in claim 2, characterized in that, The sliding block bolt (2-4) passes through the positioning washer (2-5), the support base (2-1) and the sliding block (2-2) in sequence; the inclination angle between the support base (2-1) and the fixture base plate (1) is 60-65 degrees.

4. The adaptive clamping fixture for aero-engine fan blades as described in claim 2, characterized in that, The fixing block (2-3) is mounted on the support base (2-1) by at least two positioning bolts (2-6); the support base (2-1) is fixedly connected to the clamp base plate (1) by a fixing base plate (2-9) and base plate bolts (2-7).

5. The adaptive clamping fixture for aero-engine fan blades as described in claim 1, characterized in that, The sliding box (3-6) is fixedly mounted on the fixture base plate (1) by the second fastening bolt (3-12).

6. The adaptive clamping fixture for aero-engine fan blades as described in claim 1, characterized in that, The pressure plate base (4-6) is provided with a mounting groove (4-9) for mounting the connecting rod (4-4). The end of the connecting rod (4-4) is hinged in the mounting groove (4-9) by a connecting rod bolt (4-5). At the same time, a clamping bolt (4-3) is also provided on the connecting rod (4-4) that passes through the connecting rod (4-4) and is connected in the mounting groove (4-9). The pressure plate base (4-6) is fixed to the fixture base plate (1) by the third fastening bolt (4-7).

7. A method for clamping a fan blade for an aero-engine using the clamp as described in claim 4, characterized in that, The following clamping steps are included: Steps for distributing assembly fixtures: First, install the assembled tenon positioning clamping device (2) on the clamp base plate (1) through the support base (2-1), the fixed base plate (2-9) and the base plate bolts (2-7); Then, the sliding top pressing device (3) is installed on the clamp base plate (1) on the corresponding side of the tenon positioning clamping device (2) and fixed by the second fastening bolt (3-12); then the contour top plate (5) is installed on the wedge-shaped top block (3-5) of the sliding top pressing device (3) by the support block (3-3) and the top plate pin (3-4); At the same time, the pressure plate support device (4) is used to movably set the contour pressure plate (6) above the contour top plate (5) through the pressure plate mounting hole (4-8) and the pressure plate pin (4-2); Finally, the sliding top pressing device (3) and the pressure plate support device (4) are fixed to the fixture base plate (1) by the second fastening bolt (3-12) and the third fastening bolt (4-7), respectively. Fan blade clamping steps: First, fix the fixture base plate (1) to the machine tool worktable; Then, the blade is inserted into the clamp between the sliding block (2-2) and the fixed block (2-3) with the tenon, and positioned by the positioning pin (2-8). The sliding block bolt (2-4) is adjusted, and the sliding block (2-2) is pulled to move, so that the clamping surfaces of the tenon positioning sliding block (2-2) and the tenon positioning fixed block (2-3) fit with the blade tenon, thereby achieving the purpose of positioning with the tenon. Next, by moving the sliding top pressing device (3) back and forth, the wedge block (3-1) in the sliding top pressing device (3) is pushed up and down. The wedge block (3-1) and the wedge top block (3-5) are in contact with the inclined surface in the sliding cavity of the sliding box (3-6), so that the wedge top block (3-5) pushes the contour plate (5) to move up and down. Then, by fine-tuning the blade tip contour plate (5) to rotate on the support block (3-3), the contour plate (5) and the blade are fitted together. At the same time, while adjusting the clamping bolt (4-3) to tighten the connecting rod (4-4) with a torque wrench, the contour plate (6) rotates around the plate pin (4-2) in the plate mounting hole (4-8) to achieve the purpose of fitting the contour plate (6) with the blade. In conjunction with the contour plate (5), it achieves stress-free adaptive clamping of the blade while ensuring that the part does not deform. It also ensures that the blade is free from the risk of chatter and deformation caused by the change of dynamic milling force when machining the blade tip.

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