A fixture for numerically controlled machining of thin-walled parts of aircraft frames

Abstract

The present invention discloses a fixture for CNC machining of thin-walled parts of aircraft frames, which relates to the technical field of CNC machining. It comprises a machining frame and a clamping assembly, wherein an L-shaped plate is fixedly mounted on the right side of the machining frame, a servo motor is fixedly mounted on the right side of the L-shaped plate, a lead screw is fixedly mounted on the output end of the servo motor, a U-shaped frame is fixedly mounted on the surface of the machining frame, a gear is rotatably mounted on the top of the U-shaped frame, a clamping plate is slidably mounted on the top of the machining frame, a rack 1 is fixedly mounted on the left side of the clamping plate, the rack 1 is meshed with the gear, an auxiliary plate is slidably mounted on the top of the machining frame, a rack 2 is fixedly mounted on the right side of the auxiliary plate, the rack 2 is meshed with the gear, the clamping plate is limited by a limit plate and cannot continue to move to clamp the workpiece, and the anti-clamping protection of the limit plate can prevent the clamping force from being excessively concentrated on a certain point, thereby reducing the deformation of the workpiece.

Description

Technical Field

[0001] The present invention relates to the technical field of numerical control machining, and particularly to a fixture for numerically controlling the machining of thin-walled parts of aircraft frame type. Background Art

[0002] A fixture for numerically controlling the machining of thin-walled parts of aircraft frame type generally consists of parts such as a clamping component, a positioning component, and a supporting component.

[0003] The patent with the patent announcement number CN221313324U relates to a fixture for numerical control machining and belongs to the field of numerical control machining. This fixture for numerical control machining includes a slideway frame. A motor is fixedly connected to the outer surface of the front end of the slideway frame. One end of the motor close to the slideway frame is fixedly connected to a threaded rod. The threaded rod penetrates through the outer surface of the front end of the slideway frame to the inside of the slideway frame. Convex rails are fixedly connected to the middle parts of the inner walls on the left and right sides of the slideway frame. A bearing block is slidably connected between the two convex rails. A threaded hole is opened on the outer surface of the front end of the bearing block. The threaded rod is rotationally connected to the threaded hole. When this fixture for numerical control machining is in use, the pipe column part is clamped and fixed by the three points of rack A, rack B, and rack C. Moreover, rack A, rack B, and rack C have a certain stroke when moving, so that this device can be applicable to pipe column parts with different pipe diameters. The pipe column part is clamped and fixed by using three acting points, which has the advantages of enhancing the versatility and clamping stability of the device.

[0004] In the above patent, by being applicable to pipe column parts with different pipe diameters and clamping and fixing the pipe column part by using three acting points, it has the advantages of enhancing the versatility and clamping stability of the device. However, it is difficult to provide anti-clamping protection for the workpiece. If the fixture cannot effectively disperse the clamping force, the thin-walled structure will be unevenly stressed, resulting in deformation, and further leading to fracture or surface damage of the workpiece. Summary of the Invention

[0005] Aiming at the deficiencies of the prior art, the present invention provides a fixture for numerically controlling the machining of thin-walled parts of aircraft frame type, and solves the problems put forward in the above background art.

[0006] The cam is fixedly mounted on the upper portion of the L-shaped plate, and a servo motor is fixedly mounted on the right side of the L-shaped plate. A screw is fixedly mounted on the output end of the servo motor. A U-shaped plate is fixedly mounted on the surface of the processing frame, and a gear is rotatably mounted on the top of the U-shaped frame. A clamping plate is slidably mounted on the top of the processing frame. A rack 1 is fixedly mounted on the left side of the clamping plate, and the rack 1 is meshed with the gear. An auxiliary plate is slidably mounted on the top of the processing frame, and a rack 2 is fixedly mounted on the right side of the auxiliary plate. The rack 2 is meshed with the gear. A placement slot is provided on the top of the processing frame, and a workpiece is provided on the top of the processing frame. A limit rod is fixedly mounted on the top of the processing frame, and a limit plate is slidably mounted on the circumferential surface of the limit rod. A limit slot is provided on the top of the limit plate, and the clamping plate cannot continue to move to clamp the workpiece due to the limitation of the limit plate.

[0007] According to the above technical solution, a limiting spring is arranged between the limiting rod and the limiting plate, and the limiting spring can drive the limiting plate to reset. A buffer hole is opened on the right side of the auxiliary plate, and a buffer plate is slidably installed on the inner wall of the buffer hole. A buffer block is fixedly installed on the inner wall of the buffer hole, and a linkage rod is fixedly installed on the right side of the clamping plate. The buffer block slowly deforms to cooperate with the buffer plate to prevent the workpiece from warping during processing.

[0008] According to the above technical solution, the buffer block is elastic, the clamping plate is threadedly connected to the screw rod, the auxiliary plate is threadedly connected to the screw rod, and a No. 1 spring is arranged between the buffer plate and the buffer hole. One end of the No. 1 spring is arranged on the inner wall of the buffer hole, and the other end is arranged on the surface of the buffer plate. The buffer plate can be driven to reset by the No. 1 spring.

[0009] According to the above technical solution, an auxiliary component for preventing the workpiece from being deformed is provided on the top of the processing frame, and a supporting component for improving the clamping effect of the workpiece is provided on the bottom of the processing frame. The auxiliary component includes a load-bearing hole, a load-bearing rod, a load-bearing plate, a linkage plate, a cooling device and a button. The load-bearing plate moves toward the direction close to the workpiece to contact the side of the workpiece and assist in clamping the workpiece. The load-bearing hole is opened on the top of the processing frame, the load-bearing rod is fixedly installed on the inner wall of the load-bearing hole, the load-bearing plate is slidably installed on the circumferential surface of the load-bearing rod, the linkage plate is fixed on the front side of the load-bearing plate, the cooling device is fixedly installed on the front side of the load-bearing plate, and the button is fixedly installed on the front side of the cooling device.

[0010] According to the above technical solution, a protective plate is slidably passed through the front and rear walls of the load-bearing plate, the button is electrically connected to the cooling device, and a No. 2 spring is arranged between the load-bearing plate and the load-bearing hole, and the No. 2 spring can drive the load-bearing plate to reset.

[0011] According to the above technical solution, a third spring is provided between the protection plate and the bearing plate. One end of the third spring is arranged on the surface of the protection plate, and the other end is arranged on the top of the bearing plate. The protection plate can be reset by the third spring. The button contacts the protection plate. One side of the linkage plate close to the linkage rod is set as an inclined surface, and the cooling device is adjusted by pressing the button.

[0012] According to the above technical solution, the support assembly includes a support hole, a support rod, a support frame, a square hole, a square plate and a curved panel. The support frame moves upward to contact the inside of the workpiece and support the inner wall of the workpiece. The support hole is opened at the top of the processing frame. The support rod is fixedly installed at the bottom of the processing frame. The support frame is slidably installed on the circumferential surface of the support rod. The square hole is opened on the circumferential surface of the support frame. The square plate is fixedly installed on the inner wall of the square hole. The curved panel is fixedly installed on the circumferential surface of the support rod.

[0013] According to the above technical solution, the support frame contacts the inner wall of the support hole. A fourth spring is provided between the support frame and the processing frame. The support frame can be reset by the fourth spring. The square plate contacts the bearing plate. When the support frame moves upward, the workpiece will be lifted. The waste chips between the support frame and the workpiece can be shaken off by the vibration of the support frame, thereby improving the support effect of the support frame.

[0014] The present invention provides a fixture for numerically controlling the machining of aircraft frame thin-walled parts. It has the following beneficial effects:

[0015] (1) For the fixture for numerically controlling the machining of aircraft frame thin-walled parts, the workpiece is clamped by the clamping plate being limited by the limiting plate and unable to move further. Through the anti-clamping protection of the limiting plate, the clamping force can be prevented from being overly concentrated at a certain point, thereby reducing the deformation of the workpiece and maintaining the original geometric shape and accuracy of the workpiece. The buffer block slowly generates deformation to cooperate with the buffer plate to prevent the workpiece from warping during machining. The buffer block and the buffer plate can prevent the workpiece from warping during machining, thereby maintaining the clamping accuracy of the workpiece and reducing the risk of workpiece damage.

[0016] (2) For the fixture for numerically controlling the machining of aircraft frame thin-walled parts, the bearing plate moves towards the workpiece to contact the side surface of the workpiece and assist in clamping the workpiece. By clamping from four sides, a uniform clamping force is applied to the workpiece, making it difficult for the workpiece to bend or twist during the clamping process, thereby avoiding machining errors caused by workpiece deformation.

[0017] (3) For the fixture for numerically controlling the machining of aircraft frame thin-walled parts, the protection plate moves forward to disengage from the button and release the limit on the button. The cooling device can cool the workpiece, thereby protecting the workpiece during the machining process. The protection plate can effectively prevent the temperature of the cooling device from being misadjusted, thereby ensuring the stable operation of the cooling device and further reducing the risk of workpiece thermal deformation.

[0018] (4) The fixture for numerically controlled machining of thin-walled parts of aircraft frames contacts the inside of the workpiece by moving the support frame upward and supports the inner wall of the workpiece. Through the support of the support frame, the workpiece can be firmly fixed between the clamping plate and the auxiliary plate, preventing the workpiece from shifting or deforming due to changes in cutting force during numerically controlled machining.

[0019] (5) For the fixture for numerically controlled machining of thin-walled parts of aircraft frames, if the position of the workpiece is offset, the upward movement of the support frame will lift the workpiece, thereby prompting the operator to re-align the workpiece. Through the support frame, a prompt can be issued immediately when the workpiece is offset, helping the operator quickly discover the deviation of the workpiece position, so as to promptly correct the workpiece position and prevent the expansion of machining errors. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 is a schematic diagram of the overall structure of the present invention;

[0021] Figure 2 is a schematic diagram of the positional structure of the servo motor and the lead screw of the present invention;

[0022] Figure 3 is the present invention Figure 2 enlarged schematic diagram of the structure of part A in;

[0023] Figure 4 is the present invention Figure 2 enlarged schematic diagram of the structure of part B in;

[0024] Figure 5 is a schematic diagram of the semi-sectional structure of the machining rack of the present invention;

[0025] Figure 6 is the present invention Figure 5 enlarged schematic diagram of the structure of part C in;

[0026] Figure 7 is a schematic diagram of the positional structure of the limit plate and the limit groove of the present invention.

[0027] In the figure: 1. Machining rack; 2. L-shaped plate; 3. Servo motor; 4. Lead screw; 5. U-shaped frame; 6. Gear; 7. Clamping plate; 8. Rack one; 9. Auxiliary plate; 10. Rack two; 11. Buffer hole; 12. Buffer plate; 13. Buffer block; 14. Limit spring; 15. Limit rod; 16. Limit plate; 17. Limit groove; 18. Placement groove; 19. Linking rod; 20. Workpiece; 211. Bearing hole; 212. Bearing rod; 213. Bearing plate; 214. Linking plate; 215. Cooling equipment; 216. Button; 217. Protection plate; 221. Support hole; 222. Support rod; 223. Support frame; 224. Square hole; 225. Square plate; 226. Curved plate. Detailed implementation mode

[0028] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0029] Please refer to Figures 1-6 , an embodiment of the present invention is: a fixture for numerically controlled machining of aircraft frame thin-walled parts, including a machining frame 1, and further including a clamping component. On the right side of the machining frame 1, an L-shaped plate 2 is fixedly installed. On the right side of the L-shaped plate 2, a servo motor 3 is fixedly installed. The output end of the servo motor 3 is fixedly installed with a lead screw 4. On the surface of the machining frame 1, a U-shaped frame 5 is fixedly installed. At the top of the U-shaped frame 5, a gear 6 is rotatably installed. On the top of the machining frame 1, a clamping plate 7 is slidably installed. On the left side of the clamping plate 7, a first rack 8 is fixedly installed. The first rack 8 meshes with the gear 6. On the top of the machining frame 1, an auxiliary plate 9 is slidably installed. On the right side of the auxiliary plate 9, a second rack 10 is fixedly installed. The second rack 10 meshes with the gear 6. On the top of the machining frame 1, a placement groove 18 is opened. On the top of the machining frame 1, a workpiece 20 is arranged. On the top of the machining frame 1, a limiting rod 15 is fixedly installed. On the circumferential surface of the limiting rod 15, a limiting plate 16 is slidably installed. On the top of the limiting plate 16, a limiting groove 17 is opened. Through the anti-clamping protection of the limiting plate 16, the clamping force can be prevented from being overly concentrated at a certain point, thereby reducing the deformation of the workpiece 20 and maintaining the original geometric shape and accuracy of the workpiece 20.

[0030] A limiting spring 14 is arranged between the limiting rod 15 and the limiting plate 16. Through the limiting spring 14, the limiting plate 16 can be driven to reset. On the right side of the auxiliary plate 9, a buffer hole 11 is opened. Inside the inner wall of the buffer hole 11, a buffer plate 12 is slidably installed. On the inner wall of the buffer hole 11, a buffer block 13 is fixedly installed. On the right side of the clamping plate 7, a linkage rod 19 is fixedly installed. The buffer block 13 slowly generates deformation to cooperate with the buffer plate 12 to prevent the workpiece 20 from warping during machining. Through the buffer block 13 and the buffer plate 12, the workpiece 20 can be prevented from warping during machining, thereby maintaining the clamping accuracy of the workpiece 20 and reducing the risk of damage to the workpiece 20.

[0031] The buffer block 13 has elasticity. The clamping plate 7 is threadedly connected to the lead screw 4. The auxiliary plate 9 is threadedly connected to the lead screw 4. A first spring is arranged between the buffer plate 12 and the buffer hole 11. One end of the first spring is arranged on the inner wall of the buffer hole 11, and the other end is arranged on the surface of the buffer plate 12. Through the first spring, the buffer plate 12 can be driven to reset.

[0032] During the operation of this embodiment: Place the workpiece 20 on the top of the processing frame 1. The servo motor 3 operates to drive the rotation of the screw rod 4. The rotation of the screw rod 4 drives the clamping plate 7 to move towards the workpiece 20. The movement of the clamping plate 7 towards the workpiece 20 drives the movement of the first rack 8. The movement of the first rack 8 squeezes the gear 6. The gear 6 rotates counterclockwise under the extrusion of the first rack 8. The counterclockwise rotation of the gear 6 drives the second rack 10 to move towards the L-shaped plate 2. The movement of the second rack 10 towards the L-shaped plate 2 drives the movement of the auxiliary plate 9. The movement of the auxiliary plate 9 cooperates with the clamping plate 7 to clamp the workpiece 20 together. When the clamping plate 7 moves towards the workpiece 20, the clamping plate 7 continuously moves towards the workpiece 20 and contacts the limiting groove 17. After the clamping plate 7 contacts the limiting groove 17, the limiting plate 16 moves upward under the elastic force of the limiting spring 14. The upward movement of the limiting plate 16 makes the limiting groove 17 fully contact with the clamping plate 7. The full contact between the clamping plate 7 and the limiting groove 17 and being limited by the limiting plate 16 makes the clamping plate 7 unable to move further to clamp the workpiece 20. At the same time, when the auxiliary plate 9 moves towards the L-shaped plate 2, the movement of the auxiliary plate 9 towards the L-shaped plate 2 drives the movement of the buffer plate 12. The movement of the buffer plate 12 towards the L-shaped plate 2 contacts the top of the workpiece 20 and protects the top of the workpiece 20. If the workpiece 20 warps during processing, it will squeeze the buffer plate 12 to move upward. The upward movement of the buffer plate 12 contacts the buffer block 13 and squeezes the buffer block 13. The buffer block 13 can only slowly deform under the extrusion of the buffer plate 12. The slow deformation of the buffer block 13 cooperates with the buffer plate 12 to prevent the workpiece 20 from warping during processing.

[0033] Please refer to Figures 1-7 , on the basis of the above embodiment, in another embodiment of the present invention, an auxiliary component for preventing the deformation of the workpiece 20 is provided on the top of the processing frame 1, and a support component for improving the clamping effect of the workpiece 20 is provided at the bottom of the processing frame 1. The auxiliary component includes a bearing hole 211, a bearing rod 212, a bearing plate 213, a linkage plate 214, a cooling device 215 and a button 216. The bearing hole 211 is opened on the top of the processing frame 1. The bearing rod 212 is fixedly installed on the inner wall of the bearing hole 211. The bearing plate 213 is slidably installed on the circumferential surface of the bearing rod 212. The linkage plate 214 is fixed to the front side of the bearing plate 213. The cooling device 215 is fixedly installed on the front side of the bearing plate 213. The button 216 is fixedly installed on the front side of the cooling device 215. By clamping from four sides to apply a uniform clamping force to the workpiece 20, the workpiece 20 is not easily bent or twisted during clamping, thus avoiding the processing error caused by the deformation of the workpiece 20.

[0034] The front and rear walls of the bearing plate 213 are slidably penetrated by a protection plate 217. The button 216 is electrically connected to the cooling device 215. A second spring is provided between the bearing plate 213 and the bearing hole 211, and the second spring can drive the bearing plate 213 to reset.

[0035] A third spring is provided between the protection plate 217 and the bearing plate 213. One end of the third spring is arranged on the surface of the protection plate 217, and the other end is arranged on the top of the bearing plate 213. The third spring can drive the protection plate 217 to reset. The button 216 contacts the protection plate 217. The side of the linkage plate 214 close to the linkage rod 19 is provided with an inclined surface. By pressing the button 216, the cooling device 215 can be adjusted. The protection plate 217 can effectively prevent the temperature of the cooling device 215 from being misadjusted, thereby ensuring the stable operation of the cooling device 215 and further reducing the risk of thermal deformation of the workpiece 20.

[0036] The support component includes a support hole 221, a support rod 222, a support frame 223, a square hole 224, a square plate 225 and a curved panel 226. The support hole 221 is opened at the top of the processing frame 1. The support rod 222 is fixedly installed at the bottom of the processing frame 1. The support frame 223 is slidably installed on the circumferential surface of the support rod 222. The square hole 224 is opened on the circumferential surface of the support frame 223. The square plate 225 is fixedly installed on the inner wall of the square hole 224. The curved panel 226 is fixedly installed on the circumferential surface of the support rod 222. Through the support of the support frame 223, the workpiece 20 can be firmly fixed between the clamping plate 7 and the auxiliary plate 9, and the workpiece 20 can be prevented from being displaced or deformed due to the change of the cutting force during the numerical control processing.

[0037] The support frame 223 contacts the inner wall of the support hole 221. A fourth spring is provided between the support frame 223 and the processing frame 1. The fourth spring can drive the support frame 223 to reset. The square plate 225 contacts the bearing plate 213. When the support frame 223 moves upward, the workpiece 20 will be lifted. Through the support frame 223, a prompt can be issued immediately when the workpiece 20 deviates, thereby helping the operator quickly discover the deviation of the position of the workpiece 20, and then timely correcting the position of the workpiece 20 to prevent the processing error from expanding. By vibrating the support frame 223, the waste chips between the support frame 223 and the workpiece 20 can be shaken off, thereby improving the support effect of the support frame 223.

[0038] During the operation of this embodiment: The clamping plate 7 moves towards the workpiece 20, driving the linkage rod 19 to move. The movement of the linkage rod 19 contacts the inclined surface of the linkage plate 214 and exerts pressure on the linkage plate 214. The linkage plate 214 moves towards the workpiece 20 under the pressure of the linkage rod 19. The movement of the linkage plate 214 towards the workpiece 20 drives the bearing plate 213 to move. The movement of the bearing plate 213 pulls the second spring, and the second spring generates deformation and stores energy under the pull of the bearing plate 213. Moreover, the bearing plate 213 moves towards the workpiece 20 and contacts the side surface of the workpiece 20 to assist in clamping the workpiece 20. At the same time, the movement of the bearing plate 213 towards the workpiece 20 drives the protective plate 217 to move. The movement of the protective plate 217 towards the workpiece 20 contacts the workpiece 20 and exerts pressure on the workpiece 20. The protective plate 217 moves forward under the reaction force of the workpiece 20 being squeezed, and the protective plate 217 moves forward and disengages from the contact with the button 216, releasing the limit on the button 216. After the limit on the button 216 is released, the cooling device 215 can be adjusted by pressing the button 216 to ensure the cooling effect of the cooling device 215 on the workpiece 20.

[0039] The bearing plate 213 moves towards the workpiece 20 and contacts the square plate 225, exerting pressure on the square plate 225. The square plate 225 moves upward under the pressure of the bearing plate 213. The upward movement of the square plate 225 drives the support frame 223 to move upward. The upward movement of the support frame 223 squeezes the fourth spring, and the fourth spring generates deformation and stores energy under the squeeze of the support frame 223. At the same time, the support frame 223 moves upward and contacts the inside of the workpiece 20 to support the inner wall of the workpiece 20. If the position of the workpiece 20 is offset, the upward movement of the support frame 223 will lift the workpiece 20, thereby prompting the operator to re-align the workpiece 20. When the bearing plate 213 moves back to its original position under the elastic force of the second spring, the bearing plate 213 moves back to its original position and disengages from the contact with the square plate 225. After the square plate 225 disengages from the contact with the bearing plate 213, the support frame 223 moves downward to its original position under the elastic force of the fourth spring. At the same time, the downward movement of the support frame 223 impacts the curved panel 226 to generate vibration.

[0040] Although the embodiments of the present invention have been shown and described, for those of ordinary skill in the art, it can be understood that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principles and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A fixture for CNC machining of thin-walled parts of aircraft frames, comprising a machining frame (1), characterized in that: The processing frame (1) further comprises a clamping assembly, wherein an L-shaped plate (2) is fixedly mounted on the right side of the processing frame (1), a servo motor (3) is fixedly mounted on the right side of the L-shaped plate (2), a screw rod (4) is fixedly mounted on the output end of the servo motor (3), a U-shaped frame (5) is fixedly mounted on the surface of the processing frame (1), a gear (6) is rotatably mounted on the top of the U-shaped frame (5), a clamping plate (7) is slidably mounted on the top of the processing frame (1), a rack (8) is fixedly mounted on the left side of the clamping plate (7), the rack (8) is meshed with the gear (6), and the top of the processing frame (1) slides. An auxiliary plate (9) is installed, a rack (10) is fixedly installed on the right side of the auxiliary plate (9), the rack (10) is meshed with the gear (6), a placement groove (18) is provided on the top of the processing frame (1), a workpiece (20) is provided on the top of the processing frame (1), an auxiliary component for preventing the workpiece (20) from being deformed is provided on the top of the processing frame (1), a limiting rod (15) is fixedly installed on the top of the processing frame (1), a limiting plate (16) is slidably installed on the circumferential surface of the limiting rod (15), and a limiting groove (17) is provided on the top of the limiting plate (16); A limiting spring (14) is provided between the limiting rod (15) and the limiting plate (16); a buffer hole (11) is provided on the right side of the auxiliary plate (9); a buffer plate (12) is slidably mounted on the inner wall of the buffer hole (11); a buffer block (13) is fixedly mounted on the inner wall of the buffer hole (11); and a linkage rod (19) is fixedly mounted on the right side of the clamping plate (7); The auxiliary component comprises a load-bearing hole (211), a load-bearing rod (212), a load-bearing plate (213), a linkage plate (214), a cooling device (215) and a button (216); the load-bearing hole (211) is opened on the top of the processing frame (1); the load-bearing rod (212) is fixedly mounted on the inner wall of the load-bearing hole (211); the load-bearing plate (213) is slidably mounted on the circumferential surface of the load-bearing rod (212); the linkage plate (214) is fixed on the front side of the load-bearing plate (213); the cooling device (215) is fixedly mounted on the front side of the load-bearing plate (213); and the button (216) is fixedly mounted on the front side of the cooling device (215).

2. A fixture for CNC machining of thin-walled aircraft frame parts according to claim 1, characterized in that: The buffer block (13) is elastic, the clamping plate (7) is threadedly connected to the screw rod (4), the auxiliary plate (9) is threadedly connected to the screw rod (4), and a No. 1 spring is provided between the buffer plate (12) and the buffer hole (11).

3. The fixture for CNC machining of thin-walled aircraft frame parts according to claim 2, characterized in that: A protective plate (217) is slidably passed through the front and rear walls of the load-bearing plate (213), the button (216) is electrically connected to the cooling device (215), and a No. 2 spring is provided between the load-bearing plate (213) and the load-bearing hole (211).

4. The fixture for CNC machining of thin-walled aircraft frame parts according to claim 3, characterized in that: A No. 3 spring is provided between the protective plate (217) and the load-bearing plate (213), the button (216) contacts the protective plate (217), and a side of the linkage plate (214) close to the linkage rod (19) is provided as an inclined surface.

5. The fixture for CNC machining of thin-walled aircraft frame parts according to claim 4, characterized in that: A support assembly for improving the clamping effect of the workpiece (20) is provided at the bottom of the processing frame (1), the support assembly comprising a support hole (221), a support rod (222), a support frame (223), a square hole (224), a square plate (225) and a curved plate (226), wherein the support hole (221) is provided at the top of the processing frame (1), the support rod (222) is fixedly mounted at the bottom of the processing frame (1), the support frame (223) is slidably mounted on the circumferential surface of the support rod (222), the square hole (224) is provided on the circumferential surface of the support frame (223), the square plate (225) is fixedly mounted on the inner wall of the square hole (224), and the curved plate (226) is fixedly mounted on the circumferential surface of the support rod (222).

6. The fixture for CNC machining of thin-walled aircraft frame parts according to claim 5, characterized in that: The support frame (223) contacts the inner wall of the support hole (221), a No. 4 spring is provided between the support frame (223) and the processing frame (1), and the square plate (225) contacts the load-bearing plate (213).

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