Numerical control milling machine machining clamp for thin-wall part easy to deform

Abstract

The invention discloses a numerical control milling machine machining fixture for thin-wall easily-deformed parts, and relates to the technical field of milling machine machining fixtures, the numerical control milling machine machining fixture comprises a foundation bottom plate, a plurality of anchoring mounting holes are formed in the upper surface of the foundation bottom plate, a center table body is arranged at the center of the foundation bottom plate, and a clamping placement table is arranged on the upper surface of the center table body; a clamping mechanism is further arranged on the upper surface of the foundation bottom plate and comprises a clamping plate assembly, the clamping plate assembly comprises four lifting motors, the four lifting motors are all arranged on the upper surface of the foundation bottom plate, a lifting sliding frame is arranged on the upper surfaces of the lifting motors, and a driving motor is arranged at one end of the lifting sliding frame; according to the scheme, through the arrangement of the clamping mechanism, the clamping mode can be flexibly adjusted according to the shape of a thin-wall easily-deformed part, force can be evenly applied to prevent deformation, protection and cooling functions are further achieved, and it is guaranteed that machining is stable and efficient.

Description

Technical Field

[0001] This invention relates to the field of milling machine machining fixtures, specifically a CNC milling machine machining fixture for thin-walled, easily deformable parts. Background Technology

[0002] In the field of precision machinery manufacturing, CNC milling of thin-walled, easily deformable parts (such as aerospace structural components, precision instrument housings, and complex cavity components) has always been a key process. These parts are typically characterized by thin walls, complex structures, and weak overall rigidity. The materials used are often aluminum alloys, titanium alloys, or composite materials to achieve lightweight and high-performance requirements. As the core equipment for achieving high-precision, complex surface machining, the CNC milling machine's machining efficiency is closely related to the shape accuracy, positional accuracy, and surface quality of the final part. During the machining process, the part must be reliably positioned and clamped on the machine tool table by a specialized fixture system to withstand the effects of multiple physical fields such as cutting force, cutting heat, and vibration. The performance of the fixture directly determines the overall rigidity and stability of the machining process system, and thus plays a crucial role in controlling the machining deformation of the part.

[0003] Existing fixture technology has many drawbacks. For thin-walled, easily deformable parts, traditional fixtures have serious deficiencies in clamping force control. When applying clamping force, traditional fixtures struggle to achieve uniform distribution, often resulting in excessive localized stress on the part. Due to the inherent fragility of thin-walled parts, this uneven clamping force easily causes surface indentations, severely affecting machining accuracy and surface quality, leading to a large number of defective products and increased production costs. Furthermore, existing fixtures are extremely unsuitable for machining parts with irregular surface structures. Many parts have complex protrusions, sharp objects, or other special structures on their surfaces. Traditional fixtures typically only employ a single lateral clamping method and cannot flexibly adjust to the actual shape of the part. When encountering parts with long protrusions, traditional fixtures are simply unable to achieve effective clamping, making the machining process extremely difficult. Existing fixtures are prone to problems such as wobbling and displacement, making it impossible to guarantee processing stability and consequently affecting processing accuracy and efficiency. Furthermore, they are ineffective in addressing the thermal expansion and contraction characteristics of parts. During processing, parts expand due to heat, and traditional fixtures lack corresponding yielding mechanisms. When a part expands, the fixture remains tightly clamped, generating enormous compressive stress on the part's surface. This can lead to irreversible indentations, severely damaging the part's shape and dimensional accuracy, rendering it scrap. In addition, existing fixtures have significant shortcomings in their protective functions. For parts with sharp protrusions, these sharp objects can easily puncture the fixture's flexible components, such as rubber pads, during clamping. Once these flexible components are punctured, not only will the fixture be damaged, but the clamping force will also become unstable, affecting processing quality and potentially causing safety accidents. Summary of the Invention

[0004] The purpose of this invention is to provide a CNC milling machine fixture for machining thin-walled, easily deformable parts, so as to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, the present invention provides the following technical solution: a CNC milling machine fixture for machining thin-walled, easily deformable parts, comprising:

[0006] The foundation base plate has multiple anchoring holes on its upper surface. A central platform is provided at the center of the foundation base plate. A clamping and placement platform is provided on the upper surface of the central platform. A clamping mechanism is also provided on the upper surface of the foundation base plate. The clamping mechanism includes a clamping plate assembly.

[0007] The clamping plate assembly includes: four lifting motors, all of which are mounted on the upper surface of the foundation plate. A lifting sliding frame is mounted on the upper surface of each lifting motor. A drive motor is mounted at one end of each lifting sliding frame. A meshing screw is mounted on the output end of each drive motor. The meshing screw is located at the internal center of the lifting sliding frame. A meshing base plate is meshed with the surface of the meshing screw. A connecting electric shaft is mounted on the upper surface of the meshing base plate. A connecting plate is mounted on the upper surface of the connecting electric shaft. An adjusting motor is mounted at the center of the connecting plate. A rear connecting plate is mounted at the end of the output shaft of the adjusting motor. A central storage box is mounted on one side of the rear connecting plate. A central reservoir is mounted on one side surface of the central storage box. Folding side plates are connected to both sides of the central storage box via electric drive shafts. An electromagnet is mounted at one end of each folding side plate. A battery is mounted at one end of each electromagnet. Side reservoirs are mounted on one side surface of each of the two folding side plates. Both the central and side reservoirs are filled with magnetorheological fluid.

[0008] Furthermore, a storage cavity is provided on one side surface of the central storage box, and a limiting groove for installing the rear connecting plate is provided on both the upper and lower surfaces of the storage cavity. Multiple small springs are provided inside the limiting grooves, one end of which is connected to the inner side surface of the limiting groove, and the other end is connected to one side surface of the rear connecting plate. The central storage box is also provided with a fixed top post and a telescopic top post.

[0009] Furthermore, each of the fixed and telescopic piles is provided with a connecting strip at one end, and the inner side surface of the central storage box is provided with a side slide for restricting the sliding of the connecting strip. The adjacent side surfaces of the two connecting strips are provided with meshing teeth, and a meshing toothed cylinder is also provided between the two connecting strips. One end of the meshing toothed cylinder is provided with a micro motor for driving its rotation.

[0010] Furthermore, the clamping mechanism also includes an additional component, which includes: a sliding frame body, the sliding frame body being disposed on one side surface of the observation camera, a side-position motor being disposed on one side surface of the sliding frame body, a small screw being disposed on the output end of the side-position motor, the small screw being located inside the sliding frame body, a meshing sliding block being engaged on the surface of the small screw, a small electric turntable being disposed on the upper surface of the meshing sliding block, a limiting slot being disposed on the upper surface of the small electric turntable, a rotating connecting plate being disposed on the upper surface of the limiting slot, and a meshing connecting plate being disposed on the upper surface of the rotating connecting plate.

[0011] Furthermore, the bottom end of the meshing connecting plate is provided with a sliding follower platform, and the upper surface of the sliding follower platform is provided with a sliding channel to restrict the bottom end of the meshing connecting plate and prevent it from disengaging. The side surface of the connecting plate body is also provided with a bottom slide to facilitate the sliding follower platform to slide. The upper surface of the sliding follower platform is provided with a sliding wheel, and the side surface of the connecting plate body is also provided with two limiting slides to restrict the sliding wheel.

[0012] Furthermore, a control motor is provided on one side surface of the sliding wheel, and a miniature threaded rod is provided on the output end of the control motor. The miniature threaded rod meshes with the center of the meshing connecting plate. A miniature threaded rod is provided on the bottom surface of the sliding follower platform. A limiting rod that cooperates with the driven slider is provided inside the bottom slide. A slot is opened on the bottom surface of the bottom slide. A rotating connecting plate is connected to the bottom surface of the driven slider through a rotating shaft. An additional cylindrical frame is provided between the two rotating connecting plates. Multiple movable plates are provided on the surface of the additional cylindrical frame. A torsion spring is provided at the connection between the movable plates and the additional cylindrical frame.

[0013] Furthermore, the clamping mechanism also includes auxiliary components, which include: four water storage side boxes, each disposed on one of the four side surfaces of the central platform; each water storage side box is filled with coolant; each water storage side box has two small water pumps installed inside; each water storage side box has an outlet and an inlet on both sides above it; one side surface of each of the two folding side plates is provided with a cooling auxiliary box; the surface of the cooling auxiliary box has an outlet and an inlet; an outlet connecting pipe is connected between the outlet and the outlet; a water supply connecting pipe is connected between the inlet and the inlet; and cooling plates are also provided on both sides of the water storage side boxes, with a cooling fan located at the center of each cooling plate.

[0014] Furthermore, an electric rotating shaft is provided on one side surface of the water storage side box, a connecting support rod is provided on one side surface of the electric rotating shaft, a splicing ring frame is provided between two connecting support rods on the same side, and multiple observation cameras are provided on the inner side surface of the splicing ring frame.

[0015] Compared with the prior art, the beneficial effects of the present invention are:

[0016] 1. In this solution, a clamping plate assembly is used to achieve precise and stable clamping of thin-walled, easily deformable parts. The central and side reservoirs are filled with magnetorheological fluid, which is liquid when not energized and can freely deform according to the shape of the workpiece surface, completely adhering to the workpiece surface. After energization, the magnetorheological fluid hardens, uniformly applying clamping force and avoiding excessive localized force, effectively preventing the thin-walled parts from denting due to clamping. At the same time, for workpieces with irregular surface structures, when encountering objects exceeding the deformation range of the central and side reservoirs... When the protrusion is raised, the connecting plate is rotated by the connecting electric shaft to change the orientation of the central and side reservoirs. Then, the lifting motor is used to lower it, and the side plate is used to clamp the protruding part from above to ensure stable clamping from all directions. In addition, the design of switching between the fixed top post and the telescopic top post in the central storage box can make a small adjustment when the workpiece expands due to heat, avoiding the dent on the surface of the part due to thermal expansion. This solves the problems of easy deformation, unstable clamping, and the impact of thermal expansion on the processing quality of thin-walled and easily deformable parts during clamping.

[0017] 2. In this solution, by setting up additional components, the problem of sharp protrusions on the surface of the workpiece easily piercing the central and side reservoirs is effectively solved. When the observation camera detects sharp protrusions on the surface of the workpiece, the additional cylinder is rotated to the front of the central and side reservoirs by a small electric turntable. The side motor drives the additional cylinder to move to the corresponding position. Then, by controlling the motor, the additional cylinder moves towards the central and side reservoirs and presses their surfaces to create indentations. At this time, the sharp objects on the surface of the workpiece push open the movable plate on the surface of the additional cylinder, and the sharp ends are inserted into the interior of the additional cylinder. When the workpiece surface is fitted, the sharp surfaces are prevented from piercing the central and side reservoirs, ensuring the smooth operation of the clamping work and improving the reliability and service life of the fixture.

[0018] 3. In this solution, by setting auxiliary components, the impact of heat on the performance of the magnetorheological fluid during processing is resolved, ensuring the stability of the clamping. The water storage box is filled with coolant, which is drawn by a small water pump, transferred to the cooling auxiliary box through the water supply connection pipe, and then returned to the water storage box through the water outlet connection pipe, forming a circulating cooling loop. At the same time, the cooling plate on the side surface of the water storage box, together with the cooling fan, dissipates heat from the internal coolant, ensuring that the coolant remains at a low temperature. During milling, this cooling system can promptly remove the heat transferred to the central and side storage bladders, preventing high temperatures from reducing the magnetization intensity of the magnetic particles and avoiding affecting the magnetorheological effect. This ensures the stability of the central and side storage bladders, solves the problem of heat causing a decrease in the performance of the magnetorheological fluid and affecting the clamping effect during processing, and improves the processing quality and the reliability of the fixture. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the overall structure of the present invention;

[0020] Figure 2 This is a schematic diagram of the splicing ring frame structure of the present invention;

[0021] Figure 3 This is a schematic diagram of the connection structure between the clamping plate assembly and the additional components of the present invention;

[0022] Figure 4 This is a rear view structural diagram of the clamping plate assembly and additional components of the present invention;

[0023] Figure 5 This is a schematic diagram of the additional component structure of the present invention;

[0024] Figure 6 This is a schematic diagram of the clamping plate assembly structure of the present invention;

[0025] Figure 7 This is a schematic diagram of the internal structure of the central storage box of the present invention;

[0026] Figure 8 This is a schematic diagram of the water storage side box structure of the present invention.

[0027] In the diagram: 1. Foundation plate; 2. Central platform; 3. Clamping and placement platform; 4. Lifting sliding frame; 5. Anchor mounting hole; 6. Drive motor; 7. Engaging screw; 8. Electric rotating shaft; 9. Connecting support rod; 10. Assembling ring frame; 11. Water storage side box; 12. Lifting motor; 13. Central reservoir; 14. Connecting plate; 15. Observation camera; 16. Side reservoir; 17. Engaging base plate; 18. Side position motor; 19. Additional cylinder frame; 20. Connecting electric shaft; 21. Adjustment motor; 22. Sliding frame; 23. Small screw; 24. Restricting slide; 25. Bottom slide; 26. Sliding follower platform; 27. Live 28. Moving plate; 29. ​​Rotating connecting plate; 30. Sliding wheel; 31. Control motor; 32. Driven slider; 33. Miniature threaded rod; 34. Engaging sliding block; 35. Small electric turntable; 36. Limiting slot; 37. Engaging connecting plate; 38. Battery; 39. Electromagnet; 40. Folding side plate; 41. Central storage box; 42. Rear connecting plate; 43. Fixed top pile; 44. Telescopic top pile; 45. Connecting strip; 46. Engaging tooth pattern; 47. Engaging toothed cylinder; 48. Small spring; 49. Cooling auxiliary box; 50. Water supply connecting pipe; 51. Water outlet connecting pipe; 52. Cooling plate; 53. Cooling fan. Detailed Implementation

[0028] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0029] Example 1: Please refer to Figures 1 to 8 A CNC milling fixture for machining thin-walled, easily deformable parts, comprising:

[0030] The foundation plate 1 serves as the supporting base for the entire device, possessing a stable structure and a large load-bearing area to ensure stability under various working environments. Multiple anchoring holes 5 are evenly distributed along the edges of the foundation plate 1, used to securely install it onto the work platform using bolts or other fasteners, preventing displacement or shaking during operation. A central platform 2 is located at the center of the foundation plate 1, with a clamping and placement platform 3 on its upper surface. A clamping mechanism is also provided on the upper surface of the foundation plate 1, comprising a clamping plate assembly and additional components. The clamping plate assembly includes four lifting motors 12, all mounted on the foundation plate 1. On the upper surface of the lifting motor 12, a lifting sliding frame 4 is provided. A drive motor 6 is provided at one end of the lifting sliding frame 4. A meshing screw 7 is provided on the output end of the drive motor 6. The meshing screw 7 is located at the internal center of the lifting sliding frame 4. A meshing base plate 17 is meshed on the surface of the meshing screw 7. The meshing base plate 17 is rectangular and has a threaded hole that matches the meshing screw 7 inside. A connecting electric shaft 20 is provided on the upper surface of the meshing base plate 17. A connecting plate 14 is provided on the upper surface of the connecting electric shaft 20. An adjusting motor 21 is provided at the center of the connecting plate 14. A rear connecting plate 41 is provided at the end of the output shaft of the adjusting motor 21. A central storage box 40 is provided on one side of the rear connecting plate 41. The central storage box 40 is rectangular and has a central storage box 40 inside. The central storage box 40 has a hollow structure. A storage cavity is formed on one side surface of the central storage box 40. Both the upper and lower surfaces of the storage cavity have limiting grooves for installing the rear connecting plate 41. Multiple small springs 47 are evenly distributed inside the limiting grooves. One end of each spring 47 is connected to the inner side surface of the limiting groove, and the other end is connected to one side surface of the rear connecting plate 41. The central storage box 40 also contains a fixed top post 42 and a telescopic top post 43. A connecting strip 44 is attached to one end of each of the fixed top post 42 and the telescopic top post 43. Side tracks are formed on the inner side surface of the central storage box 40 to restrict the sliding of the connecting strip 44. The side tracks match the connecting strip 44, ensuring that the connecting strip 44 can only move within the side tracks. The two connecting strips 44 slide in a straight line. Engaging teeth 45 are provided on the adjacent surfaces of the two connecting strips 44. An engaging toothed cylinder 46 is also provided between the two connecting strips 44. A micro motor for driving the rotation of the engaging toothed cylinder 46 is provided at one end. Folding side plates 39 are connected to both sides of the central storage box 40 via an electric drive shaft. An electromagnet 38 is provided at one end of the folding side plate 39, and a battery 37 is provided at one end of the electromagnet 38, providing power to the electromagnet 38. A central reservoir 13 is provided on one side surface of the central storage box 40, and side reservoirs 16 are provided on one side surface of each of the two folding side plates 39. Both the central reservoir 13 and the side reservoirs 16 are made of flexible material and are filled with magnetorheological fluid.Magnetorheological fluid is a smart material whose viscosity changes significantly with variations in an applied magnetic field. During operation, by controlling the magnetic field strength of the electromagnet 38, the viscosity of the magnetorheological fluid can be altered, thereby adjusting the hardness of the central reservoir 13 and the side reservoirs 16.

[0031] This equipment uses four clamping plate assemblies to stably clamp the workpiece. During use, the operator first places the workpiece on the upper surface of the clamping platform 3 above the central platform 2. Then, multiple observation cameras 15 observe the surface shape of the workpiece to determine which clamping method is suitable. Subsequently, the two splicing ring frames 10 are reset under the drive of the electric rotating shaft 8. At this time, the drive motors 6 at the ends of the four lifting sliding frames 4 are started, driving the meshing screws 7 to rotate. Through the meshing effect of the meshing screws 7 and the meshing base plate 17, the four connecting plates 14 are simultaneously moved inward. As the connecting plates 14 move, the central reservoir 13 and the side reservoirs 16 come into contact with the surface of the workpiece. At this point, the electromagnet 38 has not yet been energized to generate magnetic force, and the magnetorheological fluid inside the central reservoir 13 and side reservoir 16 remains in a liquid state. When the central reservoir 13 and side reservoir 16 come into contact with the surface of the workpiece, they deform according to the shape of the workpiece surface. As the connecting plate 14 slowly comes into contact with the workpiece, the central reservoir 13 and side reservoir 16 gradually adhere completely to the surface of the workpiece. At this time, the battery 37 is started under the signal drive of the operator, and by supplying power to the electromagnet 38, the electromagnet 38 generates magnetic force on the magnetorheological fluid inside the central reservoir 13 and side reservoir 16, causing the magnetorheological fluid to harden inside the central reservoir 13 and side reservoir 16. At this time, the area around the workpiece... Each central reservoir 13 and side reservoir 16 is deformed to fit its surface shape. When clamping a workpiece, because the central reservoir 13 and side reservoir 16 are completely fitted to the surface of the workpiece, a stable clamping force can be applied without excessive force. When the clamping force is applied, it is evenly distributed across the surface of the workpiece through the central reservoir 13 and side reservoir 16, resulting in a more uniform force distribution and preventing excessive localized stress. When clamping thin-walled, easily deformable objects, this method of reducing and evenly distributing clamping force makes it less prone to surface concavity due to clamping force, even under stable clamping conditions. This device is suitable for clamping workpieces with irregular surface structures. When the observation camera 15 detects a long protrusion on one side of the workpiece that exceeds the deformation range of the central reservoir 13 and the side reservoir 16, it is determined that it is not suitable for lateral clamping. After receiving the shape of the workpiece observed by the observation camera 15, the external signal control device analyzes the data and drives the connecting electric shaft 20 on the upper surface of the meshing base plate 17 on the protruding side to start. This causes the entire connecting plate 14 to rotate 90 degrees, changing the orientation of the central reservoir 13 and the side reservoir 16 downwards. Subsequently, the corresponding lifting motor 12 on the bottom surface of the lifting sliding frame 4 retracts, causing the connecting plate 14 to descend.The central reservoir 13 and side reservoirs 16 are brought into contact with the protruding part from above. Then, the two folding side plates 39 are rotated inwards via an electric drive shaft. The central reservoir 13 and the two side reservoirs 16 create a clamping effect on the protruding part of the workpiece surface from above, ensuring a stable clamping effect from all directions even when the workpiece surface has structures that are inconvenient for conventional clamping. Furthermore, the material of the workpiece may have thermal expansion and contraction characteristics. In the default state of the clamping assembly, the end of the fixed top post 42 contacts the inner side surface of the central storage box 40, and the end of the telescopic top post 43 contacts the rear connecting plate 41, thereby fixing the distance between the central storage box 40 and the connecting plate 14. After the plate assembly clamps the workpiece, the meshing gear cylinder 46 inside the central storage box 40 begins to rotate under the action of a micro motor. Through the meshing effect of the meshing gear cylinder 46 and the meshing teeth 45, the fixed top post 42 and the telescopic top post 43 are switched. The fixed top post 42 moves towards the rear connecting plate 41, while the telescopic top post 43 begins to move towards the inner side surface of the central storage box 40. At this time, the elastic post at the end of the telescopic top post 43 contacts the inner side surface of the central storage box 40. In this situation, when the workpiece expands due to heat, it will push the telescopic top post 43 and compress it, thus causing the clamping plate assembly to make a slight adjustment. This prevents the surface of the workpiece from being dented due to the clamping of the clamping plate assembly after thermal expansion.

[0032] The additional components include: a sliding frame 22, which is rectangular in shape and made of high-strength metal material, possessing good rigidity and stability, capable of withstanding the forces generated during the operation of various components. The sliding frame 22 is mounted on one side surface of the observation camera 15. A side-position motor 18 is mounted on one side surface of the sliding frame 22, and a small screw 23 is mounted on the output end of the side-position motor 18. The small screw 23 is located inside the sliding frame 22, and a sliding block 33 engages with the surface of the small screw 23. The upper surface of the sliding block 33... A small electric turntable 34 is provided, and a limiting groove 35 is provided on the upper surface of the small electric turntable 34. A rotating connecting plate 28 is provided on the upper surface of the limiting groove 35, and an engaging connecting plate 36 is provided on the upper surface of the rotating connecting plate 28. A sliding follower platform 26 is provided at the bottom end of the engaging connecting plate 36. A sliding track is formed on the upper surface of the sliding follower platform 26 to limit the bottom end of the engaging connecting plate 36 and prevent it from disengaging. The shape of the sliding track matches the bottom end of the engaging connecting plate 36 to ensure that the engaging connecting plate 36 can only slide along the sliding track on the sliding follower platform 26. The sliding mechanism 26 slides in the direction of motion and cannot disengage. The side surface of the connecting plate 14 is also provided with a bottom slide 25 to facilitate the sliding of the sliding follower platform 26. The upper surface of the sliding follower platform 26 is provided with a sliding wheel 29. The side surface of the connecting plate 14 is also provided with two limiting slides 24 to restrict the sliding wheel 29. The limiting slides 24 prevent the sliding wheel 29 from deviating during sliding, ensuring it moves along a predetermined trajectory. A control motor 30 is provided on one side surface of the sliding wheel 29, and a miniature... The threaded rod 32 and the miniature threaded rod 32 are engaged at the center of the meshing connecting plate 36. The bottom surface of the sliding follower platform 26 is provided with the miniature threaded rod 32. The bottom slide 25 is provided with a limiting rod that cooperates with the driven slider 31. The bottom surface of the bottom slide 25 is provided with a slot. The bottom surface of the driven slider 31 is connected to the rotating connecting plate 28 through a rotating shaft. An additional cylindrical frame 19 is provided between the two rotating connecting plates 28. The surface of the additional cylindrical frame 19 is provided with multiple movable plates 27. A torsion spring is provided at the connection between the movable plates 27 and the additional cylindrical frame 19.

[0033] The additional component is designed to protect the workpiece from sharp protrusions that could puncture or damage the central reservoir 13 and side reservoir 16 during clamping. In operation, when the observation camera 15 detects a sharp protrusion on one side of the workpiece, the additional component provides protection. An external signal control device drives a small electric turntable 34 to rotate 90 degrees, positioning the additional cylinder 19 in front of the central and side reservoirs 13. Subsequently, the side-position motor 18 is activated via signal control. The engagement of the small screw 23 with the sliding block 33 causes the sliding block 33 to slide within the sliding frame 22, thereby adjusting the position of the additional cylinder 19. During the movement of the additional cylinder 19, the sliding follower 26 is also connected by the engaging connecting plate 36, causing it to slide within the bottom slide 25. Thus, it moves synchronously with the auxiliary cylinder 19. When the auxiliary cylinder 19 moves to the position corresponding to the sharp protrusion, the motor 30 is started by signal drive. The engagement effect between the miniature threaded rod 32 and the engagement connecting plate 36 drives the engagement connecting plate 36 to slide inside the sliding follower table 26. The connection effect between the engagement connecting plate 36 and the rotating connecting plate 28 drives the auxiliary cylinder 19 to move towards the central reservoir 13 and the side reservoir 16, and finally presses the central reservoir 13 or the side reservoir 16 to create a depression on its surface. At this time, when the central reservoir 13 and the side reservoir 16 are in contact with the surface of the workpiece, the sharp object on the surface of the workpiece will push open the movable plate 27 on the surface of the auxiliary cylinder 19, so that its sharp end can be inserted into the interior of the auxiliary cylinder 19. At this time, when the surface of the workpiece is in contact, the sharp surface will not puncture the central reservoir 13 and the side reservoir 16.

[0034] The clamping mechanism also includes auxiliary components, which play a key role in improving the stability and safety of the clamping process and optimizing the working environment. These auxiliary components include four water-retaining side boxes 11, each located on one of the four side surfaces of the central platform 2. The central platform 2, as the core support of the clamping mechanism, provides a stable mounting base for the water-retaining side boxes 11. Each water-retaining side box 11 is filled with coolant, which has excellent thermal conductivity and chemical stability, effectively absorbing and transferring heat. Each water-retaining side box 11 contains two small water pumps, each responsible for a different circulation path. The water storage side box 11 has water outlets and water inlets on both sides above. A cooling auxiliary box 48 is provided on one side surface of the two folding side plates 39. The cooling auxiliary box 48 is made of aluminum alloy with good thermal conductivity and can quickly absorb the heat transferred from the folding side plates 39. The surface of the cooling auxiliary box 48 has water outlet holes and water inlets. A water outlet connecting pipe 50 is connected between the water outlet holes and the water inlets, and a water supply connecting pipe 49 is connected between the water inlets and the water inlets. Cooling plates 51 are also provided on both sides of the water storage side box 11. The cooling plates 51 adopt a large-area heat dissipation fin structure, which can increase the contact area with air and improve the heat dissipation efficiency. The heat sink is made of aluminum alloy, which is lightweight and has good thermal conductivity. A cooling fan 52 is set at the center of the cooling plate 51. The cooling fan 52 is driven by a DC motor and has the characteristics of large air volume and low noise. An electric rotating shaft 8 is also set on one side surface of the water storage box 11. A connecting support rod 9 is set on one side surface of the electric rotating shaft 8. A splicing ring frame 10 is set between two connecting support rods 9 on the same side. Multiple observation cameras 15 are set on the inner side surface of the splicing ring frame 10.

[0035] The additional components assist the clamping plate assembly in providing stable clamping. During use, after the workpiece is placed above the clamping platform 3, the two connecting ring frames 10 of the additional components rotate under the action of the electric rotating shaft 8, causing the two connecting ring frames 10 to assemble into a single unit above the clamping platform 3. At this time, multiple observation cameras 15 can observe the surface of the workpiece from multiple angles, thereby judging the structure of the clamped workpiece surface and facilitating the selection of different clamping schemes based on different surface structures. After the clamping plate assembly stably clamps the workpiece, during milling, the machining assembly will generate heat due to friction. When this heat is transferred to the central reservoir 13 and the side reservoirs... Inside the reservoir 16, high temperatures may reduce the magnetization of magnetic particles, affecting magnetorheological efficiency and negatively impacting the stability of the central reservoir 13 and side reservoir 16. In this case, the central reservoir 13 and side reservoir 16 are cooled by the coolant inside the water storage side box 11. During use, a small water pump inside the water storage side box 11 draws coolant from it and transmits it to the cooling auxiliary box 48 through the water supply connection pipe 49. After passing through the cooling auxiliary box 48, the coolant flows back to the water storage side box 11 through the water outlet connection pipe 50. The two cooling plates 51 on the side surface of the water storage side box 11 dissipate heat through the cooling fan 52, thereby cooling the coolant inside the water storage side box 11.

[0036] The working principle of this invention is:

[0037] Through the coordinated work of the components on the base plate 1, the workpiece is stably clamped and processed. The workpiece is placed on the clamping platform 3 above the central platform 2. The two splicing ring frames 10 in the additional components are spliced ​​together by the electric rotating shaft 8. Multiple observation cameras 15 on the inner side surface observe the surface shape of the workpiece from multiple angles to determine the appropriate clamping method.

[0038] For regular surfaces, four clamping plate assemblies play a role. Four lifting motors 12 are set on the base plate 1. One end of the lifting sliding frame 4 above it has a drive motor 6. The drive motor 6 drives the meshing screw 7 to rotate. The meshing screw 7 meshes with the meshing base plate 17, driving the connecting plate 14 to move inward. One end of the folding side plates 39 on both sides of the central storage box 40 on the connecting plate 14 has an electromagnet 38. The central reservoir 13 on one side of the central storage box 40 and the side reservoir 16 on the side of the folding side plate 39 are filled with magnetorheological fluid. During movement, the central reservoir 13 and the side reservoir 16 first contact the object surface and deform according to its shape. Then the battery 37 starts to power the electromagnet 38, which hardens the magnetorheological fluid and makes it completely adhere to the object surface, applying clamping force evenly, avoiding excessive local force, and preventing the surface of thin-walled and easily deformable objects from sinking. It is also suitable for objects with irregular surfaces.

[0039] If a long protrusion on one side of the object exceeds the deformation range and is not suitable for lateral clamping, the corresponding side's connecting electric shaft 20 drives the connecting plate 14 to rotate 90 degrees, so that the central reservoir 13 and the side reservoir 16 face downwards. The lifting motor 12 retracts, driving the connecting plate 14 to descend. The electric drive shaft drives the folding side plate 39 to rotate, creating a clamping effect on the protruding part.

[0040] Considering the thermal expansion and contraction characteristics of the processed object, after the clamping plate assembly clamps the object, the micro motor in the central storage box 40 drives the meshing tooth cylinder 46 to rotate. The meshing tooth pattern 45 drives the fixed top pile 42 and the telescopic top pile 43 to switch positions. When the object is heated and expands, it pushes the telescopic top pile 43 to compress, so that the clamping plate assembly moves slightly to avoid the surface of the object from being dented due to thermal expansion.

[0041] If the object has sharp protrusions on its surface, it may easily puncture the central reservoir 13 and the side reservoir 16. The additional component will then come into play. The small electric turntable 34 will rotate to turn the additional cylinder 19 to the front. The side motor 18 will drive the small screw 23 to rotate, causing the engaging sliding block 33 to move the additional cylinder 19. The sliding follower table 26 will move synchronously. After it moves into position, the control motor 30 will drive the miniature threaded rod 32 to rotate, causing the additional cylinder 19 to press against the central reservoir 13 or the side reservoir 16. Sharp objects will push open the movable plate 27 on the surface of the additional cylinder 19, thus avoiding puncturing the central reservoir 13 and the side reservoir 16.

[0042] In addition, four water storage side boxes 11 of the auxiliary components are set on the side surface of the central platform 2 and filled with coolant. The coolant circulates between the water storage side boxes 11 and the cooling auxiliary box 48 through a small water pump, water outlet connection pipe 50 and water supply connection pipe 49. The cooling fan 52 on the cooling plate 51 cools the coolant in the water storage side boxes 11 to prevent the processing heat from affecting the magnetorheological effect and ensure clamping stability.

[0043] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A CNC milling fixture for machining thin-walled, easily deformable parts, characterized in that, include: The foundation base plate has multiple anchoring holes on its upper surface. A central platform is provided at the center of the foundation base plate. A clamping and placement platform is provided on the upper surface of the central platform. A clamping mechanism is also provided on the upper surface of the foundation base plate. The clamping mechanism includes a clamping plate assembly. The clamping plate assembly includes: four lifting motors, all of which are mounted on the upper surface of the foundation plate. A lifting sliding frame is mounted on the upper surface of each lifting motor. A drive motor is mounted at one end of each lifting sliding frame. A meshing screw is mounted on the output end of each drive motor. The meshing screw is located at the internal center of the lifting sliding frame. A meshing base plate is meshed with the surface of the meshing screw. A connecting electric shaft is mounted on the upper surface of the meshing base plate. A connecting plate is mounted on the upper surface of the connecting electric shaft. An adjusting motor is mounted at the center of the connecting plate. A rear connecting plate is mounted at the end of the output shaft of the adjusting motor. A central storage box is mounted on one side of the rear connecting plate. A central reservoir is mounted on one side surface of the central storage box. Folding side plates are connected to both sides of the central storage box via electric drive shafts. An electromagnet is mounted at one end of each folding side plate. A battery is mounted at one end of each electromagnet. Side reservoirs are mounted on one side surface of each of the two folding side plates. Both the central and side reservoirs are filled with magnetorheological fluid.

2. A CNC milling fixture for machining thin-walled, easily deformable parts according to claim 1, characterized in that: The central storage box has a storage cavity on one side surface. The upper and lower surfaces of the storage cavity are provided with limiting grooves for installing the rear connecting plate. Multiple small springs are installed inside the limiting grooves. One end of each small spring is connected to the inner side surface of the limiting groove, and the other end is connected to one side surface of the rear connecting plate. The central storage box also has fixed top posts and telescopic top posts inside.

3. A CNC milling fixture for machining thin-walled, easily deformable parts according to claim 2, characterized in that: Both the fixed and telescopic jacks have a connecting strip at one end. The inner side surface of the central storage box is provided with a side slide for restricting the sliding of the connecting strip. The adjacent side surfaces of the two connecting strips are provided with meshing teeth. A meshing toothed cylinder is also provided between the two connecting strips. One end of the meshing toothed cylinder is provided with a micro motor for driving its rotation.

4. A CNC milling fixture for machining thin-walled, easily deformable parts according to claim 1, characterized in that: The clamping mechanism further includes an additional component, which includes: a sliding frame body, the sliding frame body being disposed on one side surface of the observation camera, a side-position motor being disposed on one side surface of the sliding frame body, a small screw being disposed on the output end of the side-position motor, the small screw being located inside the sliding frame body, a meshing sliding block being engaged on the surface of the small screw, a small electric turntable being disposed on the upper surface of the meshing sliding block, a limiting slot being disposed on the upper surface of the small electric turntable, a rotating connecting plate being disposed on the upper surface of the limiting slot, and a meshing connecting plate being disposed on the upper surface of the rotating connecting plate.

5. A CNC milling fixture for machining thin-walled, easily deformable parts according to claim 4, characterized in that: The bottom end of the meshing connecting plate is provided with a sliding follower platform. The upper surface of the sliding follower platform is provided with a sliding channel to restrict the bottom end of the meshing connecting plate and prevent it from disengaging. The side surface of the connecting plate body is also provided with a bottom slide to facilitate the sliding follower platform to slide. The upper surface of the sliding follower platform is provided with a sliding wheel. The side surface of the connecting plate body is also provided with two limiting slides to restrict the sliding wheel.

6. A CNC milling fixture for machining thin-walled, easily deformable parts according to claim 5, characterized in that: A control motor is provided on one side surface of the sliding wheel, and a miniature threaded rod is provided on the output end of the control motor. The miniature threaded rod meshes with the center of the meshing connecting plate. A miniature threaded rod is provided on the bottom surface of the sliding follower platform. A limiting rod that cooperates with the driven slider is provided inside the bottom slide. A slot is opened on the bottom surface of the bottom slide. A rotating connecting plate is connected to the bottom surface of the driven slider through a rotating shaft. An additional cylindrical frame is provided between the two rotating connecting plates. Multiple movable plates are provided on the surface of the additional cylindrical frame. A torsion spring is provided at the connection between the movable plates and the additional cylindrical frame.

7. A CNC milling fixture for machining thin-walled, easily deformable parts according to claim 1, characterized in that: The clamping mechanism also includes auxiliary components, which include: four water storage side boxes, each disposed on one of the four side surfaces of the central platform. Each water storage side box is filled with coolant and has two small water pumps installed inside. Each water storage side box has an outlet and an inlet on its upper two sides. One side surface of each of the two folding side plates has a cooling auxiliary box with an outlet and an inlet. The surface of the cooling auxiliary box has an outlet and an inlet. An outlet connecting pipe connects the outlet and the outlet, and a water supply connecting pipe connects the inlet and the inlet. Cooling plates are also provided on both sides of the water storage side boxes, with a cooling fan located at the center of each cooling plate.

8. A CNC milling fixture for machining thin-walled, easily deformable parts according to claim 7, characterized in that: An electric rotating shaft is also provided on one side surface of the water storage box, and a connecting support rod is provided on one side surface of the electric rotating shaft. A splicing ring frame is provided between two connecting support rods on the same side, and multiple observation cameras are provided on the inner side surface of the splicing ring frame.

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