Fixture for numerical control machining of aircraft frame type thin-walled parts

Abstract

The invention discloses a clamp for numerical control machining of aircraft frame type thin-wall parts, and relates to the technical field of numerical control machining, the clamp comprises a machining frame and further comprises a clamping assembly, an L-shaped plate is fixedly installed on the right side of the machining frame, a servo motor is fixedly installed on the right side of the L-shaped plate, and a lead screw is fixedly installed at the output end of the servo motor; a U-shaped frame is fixedly installed on the surface of the machining frame, a gear is rotatably installed on the top of the U-shaped frame, a clamping plate is slidably installed on the top of the machining frame, a first rack is fixedly installed on the left side of the clamping plate and meshed with the gear, an auxiliary plate is slidably installed on the top of the machining frame, and a second rack is fixedly installed on the right side of the auxiliary plate. The second rack is meshed with the gear, the clamping plate is limited by the limiting plate and cannot continue to move to clamp the workpiece, the clamping force can be prevented from being excessively concentrated at a certain point through anti-clamping protection of the limiting plate, and therefore deformation of the workpiece is reduced.

Description

Technical Field

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

[0002] A fixture for numerical control machining of thin-walled parts of aircraft frame type usually consists of parts such as a clamping assembly, a positioning assembly, and a supporting assembly.

[0003] The patent with the patent publication number CN221313324U relates to a fixture for numerical control machining, belonging 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 force application 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 using three force application points to clamp and fix the pipe column part, 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 numerical control machining of thin-walled parts of aircraft frame type, and solves the problems raised in the above background technique.

[0006] To achieve the above objectives, the present invention is realized through the following technical solutions: A fixture for numerically controlled machining of thin-walled aircraft frame parts includes a machining frame and also a clamping assembly. On the right side of the machining frame, an L-shaped plate is fixedly installed. On the right side of the L-shaped plate, a servo motor is fixedly installed. At the output end of the servo motor, a lead screw is fixedly installed. On the surface of the machining frame, a U-shaped frame is fixedly installed. At the top of the U-shaped frame, a gear is rotatably installed. On the top of the machining frame, a clamping plate is slidably installed. On the left side of the clamping plate, a first rack is fixedly installed. The first rack meshes with the gear. On the top of the machining frame, an auxiliary plate is slidably installed. On the right side of the auxiliary plate, a second rack is fixedly installed. The second rack meshes with the gear. On the top of the machining frame, a placement groove is opened. On the top of the machining frame, a workpiece is arranged. On the top of the machining frame, a limiting rod is fixedly installed. On the circumferential surface of the limiting rod, a limiting plate is slidably installed. On the top of the limiting plate, a limiting groove is opened. The clamping plate is limited by the limiting plate and cannot move further to clamp the workpiece.

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

[0008] According to the above technical solution, the buffer block is elastic. The clamping plate is threadedly connected to the lead screw. The auxiliary plate is threadedly connected to the lead screw. Between the buffer plate and the buffer hole, a first spring is arranged. One end of the first 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 first spring can drive the buffer plate to reset.

[0009] According to the above technical solution, an auxiliary assembly for preventing the workpiece from deforming is arranged on the top of the machining frame. A support assembly for improving the clamping effect of the workpiece is arranged at the bottom of the machining frame. The auxiliary assembly 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 towards the workpiece and contacts the side surface of the workpiece to assist in clamping the workpiece. The load-bearing hole is opened on the top of the machining 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 to the front side of the load-bearing plate. The cooling device is fixedly installed on the front side of the load-bearing plate. The button is fixedly installed on the front side of the cooling device.

[0010] According to the above technical solution, a protective plate slidably penetrates through the front and rear walls of the load-bearing plate. The button is electrically connected to the cooling device. Between the load-bearing plate and the load-bearing hole, a second spring is arranged. The second spring can drive the load-bearing plate to reset.

[0011] According to the above technical solution, a No. 3 spring is arranged between the protective plate and the load-bearing plate, one end of the No. 3 spring is arranged on the surface of the protective plate, and the other end is arranged on the top of the load-bearing plate. The No. 3 spring can drive the protective plate to reset, the button is in contact with the protective plate, and the side of the linkage plate close to the linkage rod is set as an inclined surface, and the cooling equipment 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 plate. 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, and the curved plate is fixedly installed on the circumferential surface of the support rod.

[0013] According to the above technical solution, the support frame is in contact with the inner wall of the support hole, and a No. 4 spring is arranged between the support frame and the processing frame, through which the support frame can be driven to reset, and the square plate is in contact with the load-bearing plate. The support frame moves upward to lift the workpiece, and the waste chips between the support frame and the workpiece can be shaken off by the vibration of the support frame, thereby improving the supporting effect of the support frame.

[0014] The present invention provides a fixture for numerical control machining of thin-walled parts such as aircraft frames. It has the following beneficial effects: (1) The fixture for CNC machining of thin-walled parts such as aircraft frames clamps the workpiece by limiting the clamping plate by the limit plate and preventing it from moving further. 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 and maintaining the original geometric shape and precision of the workpiece. The buffer block slowly deforms and cooperates 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 damage to the workpiece.

[0015] (2) The fixture for CNC machining of thin-walled parts such as aircraft frames moves the load-bearing plate toward the workpiece to contact the side of the workpiece and assist in clamping the workpiece. A uniform clamping force is applied to the workpiece by clamping on all four sides, making it less likely for the workpiece to bend or twist during the clamping process, thereby avoiding machining errors caused by deformation of the workpiece.

[0016] (3) The fixture for CNC machining of thin-walled parts such as aircraft frames can move the protective plate forward to break contact with the button and release the limit on the button. The workpiece can be cooled by the cooling device, thereby protecting the workpiece during the machining process. The protective 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 thermal deformation of the workpiece.

[0017] (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 numerical control machining.

[0018] (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 correct the workpiece position in time and prevent the expansion of machining errors. Description of the Drawings

[0019] Figure 1 It is a schematic diagram of the overall structure of the present invention; Figure 2 It is a schematic diagram of the position structure of the servo motor and the lead screw of the present invention; Figure 3 For the present invention Figure 2 It is an enlarged schematic diagram of the structure of part A in the present invention; Figure 4 For the present invention Figure 2 It is an enlarged schematic diagram of the structure of part B in the present invention; Figure 5 It is a semi-sectional schematic diagram of the machining frame of the present invention; Figure 6 For the present invention Figure 5 It is an enlarged schematic diagram of the structure of part C in the present invention; Figure 7 It is a schematic diagram of the position structure of the limiting plate and the limiting groove of the present invention.

[0020] In the figure: 1. Machining frame; 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. Limiting spring; 15. Limiting rod; 16. Limiting plate; 17. Limiting groove; 18. Placing groove; 19. Linking rod; 20. Workpiece; 211. Load-bearing hole; 212. Load-bearing rod; 213. Load-bearing plate; 214. Linking plate; 215. Cooling device; 216. Button; 217. Protective plate; 221. Support hole; 222. Support rod; 223. Support frame; 224. Square hole; 225. Square plate; 226. Curved panel. Detailed Embodiments

[0021] The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to 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.

[0022] Please refer to Figures 1 - 6 , an embodiment of the present invention is: A fixture for numerically controlled machining of thin-walled parts of aircraft frame type, including a machining frame 1, and further including a clamping assembly. 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. At the output end of the servo motor 3, a lead screw 4 is fixedly installed. 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 provided. 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.

[0023] 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 deforms to cooperate with the buffer plate 12 to prevent the workpiece 20 from tilting during machining. Through the buffer block 13 and the buffer plate 12, the workpiece 20 can be prevented from tilting during machining, thereby maintaining the clamping accuracy of the workpiece 20 and reducing the risk of damage to the workpiece 20.

[0024] 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.

[0025] During the operation of this embodiment: Place the workpiece 20 on the top of the processing rack 1. The servo motor 3 operates to drive the lead screw 4 to rotate. The rotation of the lead screw 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 first rack 8 to move. 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 auxiliary plate 9 to move. 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 limit groove 17. After the clamping plate 7 contacts the limit groove 17, the limit plate 16 moves upward under the elastic force of the limit spring 14. The upward movement of the limit plate 16 causes the limit groove 17 to be in full contact with the clamping plate 7. The clamping plate 7 is in full contact with the limit groove 17 and is limited by the limit plate 16. The clamping plate 7 is limited by the limit plate 16 and cannot continue to move 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 buffer plate 12 to move. 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.

[0026] 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 rack 1, and a support component for improving the clamping effect of the workpiece 20 is provided at the bottom of the processing rack 1. The auxiliary component includes 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 rack 1. The load-bearing rod 212 is fixedly installed on the inner wall of the load-bearing hole 211. The load-bearing plate 213 is slidably installed on the circumferential surface of the load-bearing rod 212. The linkage plate 214 is fixed to the front side of the load-bearing plate 213. The cooling device 215 is fixedly installed on the front side of the load-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 distorted during clamping, thereby avoiding the processing error caused by the deformation of the workpiece 20.

[0027] The front and rear walls of the load-bearing plate 213 are slidably penetrated by a protective plate 217. The button 216 is electrically connected to the cooling device 215. A second spring is provided between the load-bearing plate 213 and the load-bearing hole 211, and the second spring can drive the load-bearing plate 213 to reset.

[0028] A third spring is provided between the protective plate 217 and the load-bearing plate 213. One end of the third spring is arranged on the surface of the protective plate 217, and the other end is arranged on the top of the load-bearing plate 213. The third spring can drive the protective plate 217 to reset. The button 216 contacts the protective plate 217. The side of the linkage plate 214 close to the linkage rod 19 is set as an inclined surface. The cooling device 215 is adjusted by pressing the button 216. The protective 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.

[0029] The support assembly 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. The workpiece 20 can be firmly fixed between the clamping plate 7 and the auxiliary plate 9 through the support of the support frame 223, and the workpiece 20 can be prevented from shifting or deforming due to the change of the cutting force during the numerical control processing.

[0030] 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, and the fourth spring can drive the support frame 223 to reset. The square plate 225 contacts the load-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 machining error from expanding. The waste chips between the support frame 223 and the workpiece 20 can be shaken off by the vibration of the support frame 223, thereby improving the support effect of the support frame 223.

[0031] 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 squeezes the linkage plate 214. The linkage plate 214 is squeezed by the linkage rod 19 and moves towards the workpiece 20. The movement of the linkage plate 214 towards the workpiece 20 drives the load-bearing plate 213 to move. The movement of the load-bearing plate 213 pulls the second spring. The second spring is pulled by the load-bearing plate 213 and deforms and stores energy. And the load-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 load-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 squeezes the workpiece 20. The protective plate 217 moves forward under the reaction force of the squeezed workpiece 20, and the protective plate 217 moves forward and disengages from the contact with the button 216 and releases 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.

[0032] The load-bearing plate 213 moves towards the workpiece 20 and contacts the square plate 225 and squeezes the square plate 225. The square plate 225 is squeezed by the load-bearing plate 213 and moves upward. 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. The fourth spring is squeezed by the support frame 223 and deforms and stores energy. 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 load-bearing plate 213 moves back to its original position under the elastic force of the second spring, the load-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 load-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.

[0033] 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 deformations 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 such as aircraft frames, comprising a machining frame (1), characterized in that: The processing frame (1) also includes 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 lead screw (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) is slidably mounted. 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 arranged on the top of the processing frame (1), an auxiliary component for preventing the workpiece (20) from deforming is arranged on the top of the processing frame (1), a limit rod (15) is fixedly installed on the top of the processing frame (1), a limit plate (16) is slidably installed on the circumferential surface of the limit rod (15), and a limit groove (17) is provided on the top of the limit plate (16).

2. A fixture for CNC machining of thin-walled aircraft frame parts according to claim 1, characterized in that: A limit spring (14) is arranged between the limit rod (15) and the limit 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).

3. A fixture for CNC machining of thin-walled aircraft frame parts according to claim 2, 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).

4. A fixture for CNC machining of thin-walled aircraft frame parts according to claim 3, characterized in that: 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).

5. A fixture for CNC machining of thin-walled aircraft frame parts according to claim 4, characterized in that: A protective plate (217) is slidably penetrated 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).

6. A fixture for CNC machining of thin-walled aircraft frame parts according to claim 5, characterized in that: A No. 3 spring is provided between the protective plate (217) and the load-bearing plate (213), the button (216) is in contact with the protective plate (217), and a side of the linkage plate (214) close to the linkage rod (19) is provided as an inclined surface.

7. A fixture for CNC machining of thin-walled aircraft frame parts according to claim 6, characterized in that: A support assembly for improving the clamping effect of the workpiece (20) is arranged 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); the support hole (221) is opened 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 opened 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).

8. The fixture for CNC machining of thin-walled aircraft frame parts according to claim 7, 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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