A clamping device for CNC machining of micro-precision thin-walled metal structural parts

Abstract

The present invention discloses a clamping device for CNC machining of micro-precision thin-walled metal structural parts, belonging to the technical field of tooling fixtures. The present invention comprises an outer cover body, a lifting assembly platform is slidably installed inside the outer cover body, an eddy current component is rotatably installed at the bottom of the outer cover body, a mounting foot is arranged outside the bottom of the outer cover body, and the outer cover body is fixed to the machine tool through the mounting foot and bolts, a plurality of groups of clamping components are arranged inside the lifting assembly platform, and the plurality of groups of the clamping components are evenly distributed in a circular shape, each group of clamping components penetrates the outer cover body to clamp the workpiece, the eddy current component clears the cutting chips on the clamping device, and a screw sleeve that can be detached from the groove shaft is arranged to drive all the clamping shafts to clamp the structural parts, and all the clamping shafts disperse the total clamping force, and the shock-absorbing rubber further prevents damage to the thin-walled structural parts, prevents the thin-walled structural parts from deformation, and realizes multiple contour adaptive clamping.

Description

Technical Field

[0001] The invention relates to the technical field of tooling fixtures, and in particular to a clamping device used for CNC machining of micro-precision thin-walled metal structural parts. Background Art

[0002] CNC machining is a manufacturing technology that uses computer-controlled machine tools for automated processing. It uses specially designed computer programs to control machine tools and tools to accurately cut or engrave various materials, such as metal, plastic, wood, etc., to produce parts or products with complex shapes and high-precision requirements. It has the advantages of high precision, good flexibility, full automation support, and excellent cost-effectiveness. It has become the mainstream equipment for machining. For the processing of thin-walled metal structural parts, suitable tooling and fixtures must be used to position the workpiece, and the characteristics must be uniform force, stable clamping, no interference on the machining surface, and rapid loading and unloading. However, the existing tooling and fixtures have low universality. Different special fixtures need to be designed for workpieces with different contours. The clamping force is unevenly distributed, and the problem of deformation of thin-walled workpieces still needs to be improved. Summary of the invention

[0003] The object of the present invention is to provide a clamping device for CNC machining of micro-precision thin-walled metal structural parts to solve the problems raised in the above-mentioned background technology.

[0004] In order to solve the above technical problems, the present invention provides the following technical solutions: A clamping device for CNC processing of micro-precision thin-walled metal structural parts includes an outer cover body, a lifting assembly platform is slidably installed inside the outer cover body, an eddy current component is rotatably arranged at the bottom of the outer cover body, and a mounting foot is arranged on the outer side of the bottom of the outer cover body. The outer cover body is fixed to the machine tool by the mounting foot and bolts, and a plurality of groups of clamping components are arranged in the lifting assembly table, and the plurality of groups of the clamping components are evenly distributed in a circle, and each group of clamping components passes through the outer cover body to clamp the workpiece, and the eddy current component cleans the cutting chips on the clamping device.

[0005] Furthermore, a clamping cavity is opened inside the outer cover body, and a plurality of dustproof grooves are opened through the upper and lower parts of the outer cover body. The number and arrangement of the dustproof grooves are the same as those of the clamping assembly. The dustproof grooves are connected to the clamping cavity. Three side grooves are also opened on the side of the outer cover body, and the three side grooves are arranged at right angles and spaced apart in sequence.

[0006] Furthermore, a pile of large protrusions are symmetrically arranged on the outside of the lifting assembly platform, and two of the large protrusions are slidably arranged in symmetrically arranged side grooves. A pair of second electric push cylinders are installed on the outside of the outer cover through a bracket, and the telescopic rods of the two second electric push cylinders are respectively connected to the two large protrusions. The two second electric push cylinders are connected to a control system through a circuit. A plurality of sliding cavities are opened inside the lifting assembly platform, and each of the sliding cavities is provided with a clamping assembly. A middle chamber is opened in the middle of the lifting assembly platform, and the middle chamber is connected to each sliding cavity. A sliding plate groove is also opened on the side wall of each sliding cavity. The operator first uses the control system to control the second electric push cylinder to drive the large protrusion to move according to the thickness of the structural part to be clamped, and drives the lifting assembly platform to rise or fall through the two large protrusions, and adjusts the height of the clamping shaft extending out of the surface of the outer cover so that the height of the clamping shaft is adapted to the thickness of the structural part.

[0007] Furthermore, each group of the clamping components includes an assembly slider, a clamping shaft, a spur gear and a rack plate, the assembly slider is slidably installed in the sliding cavity, the clamping shaft is coaxially arranged with the spur gear, the spur gear is rotatably installed inside the assembly slider, the rack plate is slidably arranged in the slide groove, a damping wheel is installed on the side of the rack plate in contact with the slide groove, the rack plate is in sliding contact with the assembly slider, the rack plate is meshed with the spur gear, the clamping shaft passes through the dustproof groove, half of the surface of each clamping shaft is wrapped with shock-absorbing rubber, each dustproof groove is covered with a cloth cover, the clamping shaft passes through the cloth cover, and the active bevel gear controls the clamping shafts to spread outward or move inward at the same time. When all the clamping shafts move outward at the same time, the structural member can be clamped from the inside, which is convenient for the machine tool tool to process the outside of the structural member. Although the assembly slider starts to move outward, the rack plate is limited by the damping wheel on the slide The gear still remains stationary in the groove, so the spur gear begins to roll half a circle along the surface of the rack plate, and at the same time drives the clamping shaft to rotate half a circle so that the shock-absorbing rubber faces outward. When the spur gear rolls to the end along the rack plate, the teeth of the spur gear press against the rack plate and cannot continue to rotate. Finally, the thrust of the assembly slider on the rack plate overcomes the resistance of the damping wheel to the rack plate, and the rack plate moves synchronously with the movement of the assembly slider. When all the clamping shafts move inward at the same time, the structural parts can be clamped from the outside, which is convenient for the machine tool's tool to process the inside of the structural parts. At the same time, the clamping shaft rotates half a circle to make the shock-absorbing rubber face inward. Therefore, no matter whether the clamping shaft moves outward or inward, the shock-absorbing rubber will quickly adjust to the clamping side, and all the clamping shafts disperse the total clamping force. The shock-absorbing rubber further prevents damage to thin-walled structural parts, prevents deformation of thin-walled structural parts, and realizes adaptive clamping of multiple contours.

[0008] Furthermore, an outer ring, an inner rotating block, a plurality of side pressure fixing plates and an elastic protrusion are provided in the clamping cavity, the outer ring and the inner rotating block are rotatably arranged in the clamping cavity, a side pressure fixing plate is provided on one side of each of the dustproof grooves, a plurality of the side pressure fixing plates are connected between the outer ring and the inner rotating block, the elastic protrusion is arranged on the outside of the outer ring, the elastic protrusion extends out of a side groove, and a first electric push cylinder is installed on the outside of the outer cover body, the piston rod of the first electric push cylinder is rotatably connected with the elastic protrusion, before the clamping shaft moves, the control system first controls the first electric push cylinder to push the elastic protrusion, and the elastic protrusion drives the outer ring, the inner rotating block and the plurality of side pressure fixing plates to deflect a certain angle in the clamping cavity, after the clamping shaft moves and positions, the first electric push cylinder pulls the elastic protrusion to reset, and the side pressure fixing plate presses against the clamping shaft from the side to further fix the clamping shaft, so that the clamping shaft clamps the structural member more firmly.

[0009] Furthermore, each group of the clamping components also includes a screw sleeve, a grooved shaft and several engaging strips, a screw hole is opened at the bottom of the assembly slider, the grooved shaft is rotatably installed in the sliding cavity, the screw sleeve is sleeved on the outside of the grooved shaft, the screw sleeve is threadedly connected to the screw hole, a driven bevel gear is coaxially installed on one side of the grooved shaft, the driven bevel gear is located in the middle chamber, and an active bevel gear is rotatably arranged in the middle chamber, the active bevel gear is meshed and connected with all the driven bevel gears, a first servo motor is arranged at the bottom of the lifting assembly platform, the first servo motor is coaxially connected with the active bevel gear, after the height adjustment of the clamping shaft is completed, the control system enables the first servo motor to be energized and work, the first servo motor drives the active bevel gear to rotate, the active bevel gear drives all the driven bevel gears to rotate, the driven bevel gear drives the grooved shaft to rotate, the engaging strip is embedded in the groove under the top push of the spring, the rotation of the grooved shaft drives the screw sleeve to rotate through the transmission of the engaging strip, the screw sleeve causes the assembly slider to slide along the sliding cavity through threaded transmission, drives the clamping shaft to move, and the clamping shaft clamps the structural member.

[0010] Furthermore, the interior of the screw sleeve is provided with several long sliding grooves evenly distributed in a ring shape, and several engaging strips are respectively arranged in the long sliding grooves, and several springs are connected between each engaging strip and the long sliding groove. The surface of the groove shaft is provided with engaging grooves matching the engaging strips. Since the contour shapes of the structural parts are not consistent, the clamping shaft that first contacts the structural part is blocked, and the clamping shaft that contacts the structure cannot move further after reaching a certain clamping force, so that the screw sleeve cannot rotate. Although the groove shaft is still rotating at this time, the engaging strip overcomes the thrust of the spring and shrinks into the long sliding groove. Finally, the engaging strip disengages from the engaging groove and continuously crosses the engaging groove. At this time, the rotation of the groove shaft no longer continues to drive the corresponding clamping shaft to move, while other clamping shafts that have not contacted the structural parts can continue to move until they also contact the structural parts. After all the clamping shafts complete the clamping of the structural parts, the first servo motor stops rotating, and all the groove shafts stop rotating.

[0011] Furthermore, the eddy current assembly includes a gear ring, a plurality of sector-shaped magnetic plates, and the plurality of sector-shaped magnetic plates are arranged in the gear ring. The same side of every two adjacent sector-shaped magnetic plates have opposite magnetic properties. A second servo motor is arranged on the outside of the outer cover, and a driving gear is installed on the second servo motor. The driving gear is meshed with the gear ring through a side groove. After machining is completed, the operator removes the machined structural parts, and the second servo motor is energized to drive the driving gear to rotate. The driving gear drives the gear ring to rotate, and the gear ring drives all the sector-shaped magnetic plates to rotate. The magnetic lines of force generate induced eddy currents in the metal cutting chips generated by machining, and then generate an induced magnetic field that repels the sector-shaped magnetic plates. According to the principle of the eddy current separator, the cutting chips are repelled from the clamping device to achieve the cleaning of the metal cutting chips.

[0012] Compared with the prior art, the beneficial effects achieved by the present invention are:

[0013] By setting a screw sleeve that can be detached from the groove axis and rotated, all the clamping shafts are driven to clamp the structural parts. No matter the clamping shaft moves outward or inward, the shock-absorbing rubber will quickly adjust to the clamping side. All the clamping shafts disperse the total clamping force. The shock-absorbing rubber further prevents damage to thin-walled structural parts and deformation of thin-walled structural parts, thereby realizing adaptive clamping of various contours. By utilizing the rotation of the fan-shaped magnetic plate, the magnetic lines of force generate induced eddy currents in the metal cutting chips generated by machining, and then generate an induced magnetic field that repels the fan-shaped magnetic plate. According to the principle of the eddy current separator, the cutting chips are repelled from the clamping device, thereby realizing the cleaning of metal cutting chips. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] The accompanying drawings are used to provide a further understanding of the present invention and constitute a part of the specification. Together with the embodiments of the present invention, they are used to explain the present invention and do not constitute a limitation of the present invention. In the accompanying drawings:

[0015] Figure 1 The overall appearance structure of the present invention is schematically shown Figure 1 ;

[0016] Figure 2 The overall appearance structure of the present invention is schematically shown Figure 2 ;

[0017] Figure 3 The explosion structure of the present invention is schematically shown in FIG. Figure 1 ;

[0018] Figure 4 The explosion structure of the present invention is schematically shown in FIG. Figure 2 ;

[0019] Figure 5 It is a schematic structural diagram of the outer cover body of the present invention;

[0020] Figure 6It is a structural schematic diagram of the lifting assembly platform part of the present invention;

[0021] Figure 7 This is a schematic diagram of the structure of the assembly slider portion of the present invention. Figure 1 ;

[0022] Figure 8 This is a schematic diagram of the structure of the assembly slider portion of the present invention. Figure 2 ;

[0023] Fig. 9 It is a structural schematic diagram of the slotted shaft part of the present invention;

[0024] In the figure: 1, outer cover; 2, clamping cavity; 301, side groove; 302, dustproof groove; 4, outer ring; 5, inner rotating block; 6, side pressure fixing plate; 7, elastic protrusion; 8, first electric push cylinder; 9, lifting assembly platform; 10, sliding cavity; 11, sliding plate groove; 12, middle chamber; 13, large protrusion; 14, second electric push cylinder; 15, first servo motor; 16, active bevel gear; 17, clamping shaft; 18, spur gear; 19, assembly slider; 20, rack plate; 21, damping wheel; 22, screw sleeve; 23, grooved shaft; 24, engaging strip; 25, spring; 26, second servo motor; 27, driving gear; 28, gear ring; 29, fan-shaped magnetic plate; 30, driven bevel gear. DETAILED DESCRIPTION

[0025] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0026] See also Figure 1-Figure 9 The present invention provides a technical solution: a clamping device for CNC machining of micro-precision thin-walled metal structural parts comprises an outer cover body 1, a lifting assembly platform 9 is slidably installed inside the outer cover body 1, an eddy current component is rotatably arranged at the bottom of the outer cover body 1, a mounting foot is arranged on the outer side of the bottom of the outer cover body 1, and the outer cover body 1 is fixed to the machine tool by the mounting foot and bolts, a plurality of groups of clamping components are arranged in a circular shape, and each group of clamping components passes through the outer cover body 1 to clamp the workpiece, and the eddy current component cleans the cutting chips on the clamping device.

[0027] A clamping cavity 2 is provided inside the outer cover body 1, and a plurality of dustproof grooves 302 are provided through the upper and lower parts of the outer cover body 1. The number and arrangement of the dustproof grooves 302 are the same as those of the clamping assembly. The dustproof grooves 302 are connected to the clamping cavity 2. Three side grooves 301 are also provided on the side of the outer cover body 1. The three side grooves 301 are arranged at right angles and in sequence. A pile of large protrusions 13 are symmetrically provided on the outside of the lifting assembly platform 9. Two large protrusions 13 are slidably provided in the symmetrically arranged side grooves 301. A pair of second electric push cylinders 14 are installed on the outside of the outer cover body 1 through a bracket. The telescopic rods of the two second electric push cylinders 14 are respectively connected to the two large protrusions 13. The two second electric push cylinders 14 are respectively connected to the two large protrusions 13. The push cylinder 14 is connected to the control system through the circuit. A plurality of sliding cavities 10 are provided inside the lifting assembly platform 9. A clamping assembly is provided in each sliding cavity 10. A middle chamber 12 is provided in the middle of the lifting assembly platform 9. The middle chamber 12 is connected to each sliding cavity 10. A slide groove 11 is provided on the side wall of each sliding cavity 10. The operator first uses the control system to control the second electric push cylinder 14 to drive the large protrusion 13 to move according to the thickness of the structural part to be clamped, and drives the lifting assembly platform 9 to rise or fall through the two large protrusions 13, and adjusts the height of the clamping shaft 17 extending out of the surface of the outer cover body 1 so that the height of the clamping shaft 17 is adapted to the thickness of the structural part.

[0028] Each clamping assembly includes a screw sleeve 22, a groove shaft 23 and several engaging strips 24. A screw hole is provided at the bottom of the assembly slider 19. The groove shaft 23 is rotatably installed in the sliding cavity 10. The screw sleeve 22 is sleeved on the outside of the groove shaft 23. The screw sleeve 22 is threadedly connected to the screw hole. A driven bevel gear 30 is coaxially installed on one side of the groove shaft 23. The driven bevel gear 30 is located in the middle chamber 12. An active bevel gear 16 is rotatably arranged in the middle chamber 12. The active bevel gear 16 is meshed and connected with all the driven bevel gears 30. A first servo motor 15 is provided at the bottom of the lifting assembly platform 9. The first servo motor 15 is coaxially connected to the active bevel gear 16. Several long slide grooves are evenly distributed in an annular shape inside the screw sleeve 22. Several engaging strips 24 are respectively arranged in the long slide grooves. Several springs 25 are connected between each engaging strip 24 and the long slide groove. A groove matching the engaging strip 24 is provided on the surface of the groove shaft 23.

[0029] After the height adjustment of the clamping shaft 17 is completed, the control system energizes the first servo motor 15 to work, the first servo motor 15 drives the active bevel gear 16 to rotate, the active bevel gear 16 drives all the driven bevel gears 30 to rotate, the driven bevel gears 30 drive the slot shaft 23 to rotate, the engaging strip 24 is embedded in the slot under the push of the spring 25, the rotation of the slot shaft 23 drives the screw sleeve 22 to rotate through the transmission of the engaging strip 24, the screw sleeve 22 drives the assembly slider 19 to slide along the sliding cavity 10 through the threaded transmission, drives the clamping shaft 17 to move, the clamping shaft 17 clamps the structural parts, because the contour shapes of the structural parts are not consistent, so it first contacts the structural parts. The clamping shaft 17 of the component is blocked, and the clamping shaft 17 that contacts the structure cannot move further after reaching a certain clamping force, so that the screw sleeve 22 cannot rotate. Although the groove shaft 23 is still rotating at this time, the engaging strip 24 overcomes the thrust of the spring 25 and retracts into the long slide groove. Finally, the engaging strip 24 disengages from the groove and continues to cross the groove. At this time, the rotation of the groove shaft 23 no longer continues to drive the corresponding clamping shaft 17 to move, while other clamping shafts 17 that have not contacted the structural parts can continue to move until they also contact the structural parts. After all the clamping shafts 17 complete the clamping of the structural parts, the first servo motor 15 stops rotating, and all the groove shafts 23 stop rotating.

[0030] The clamping chamber 2 is provided with an outer ring 4, an inner rotating block 5, a plurality of side pressure fixing plates 6 and an elastic protrusion 7. The outer ring 4 and the inner rotating block 5 are rotatably arranged in the clamping chamber 2. A side pressure fixing plate 6 is arranged on one side of each dustproof groove 302. The plurality of side pressure fixing plates 6 are connected between the outer ring 4 and the inner rotating block 5. The elastic protrusion 7 is arranged on the outer side of the outer ring 4. The elastic protrusion 7 extends out of a side groove 301. The outer side of the outer cover body 1 is provided with a first electric push cylinder 8. The piston rod of the first electric push cylinder 8 is connected to the elastic The protrusion 7 is rotatably connected. Before the clamping shaft 17 moves, the control system first controls the first electric push cylinder 8 to push the elastic protrusion 7. The elastic protrusion 7 drives the outer ring 4, the inner rotating block 5 and a plurality of side pressure fixing plates 6 to deflect a certain angle in the clamping cavity 2. After the movement and positioning of the clamping shaft 17 is completed, the first electric push cylinder 8 pulls the elastic protrusion 7 to reset, and the side pressure fixing plate 6 presses against the clamping shaft 17 from the side to further fix the clamping shaft 17, so that the clamping shaft 17 clamps the structural parts more firmly.

[0031] Each clamping assembly includes an assembly slider 19, a clamping shaft 17, a spur gear 18 and a rack plate 20. The assembly slider 19 is slidably mounted in the slide cavity 10. The clamping shaft 17 is coaxially arranged with the spur gear 18. The spur gear 18 is rotatably mounted inside the assembly slider 19. The rack plate 20 is slidably arranged in the slide groove 11. A damping wheel 21 is installed on the side of the rack plate 20 that contacts the slide groove 11. The rack plate 20 is in sliding contact with the assembly slider 19. The rack plate 20 is meshed with the spur gear 18. The clamping shaft 17 penetrates through the assembly slider 19. Dustproof groove 302, half of the surface of each clamping shaft 17 is wrapped with shock-absorbing rubber, and each dustproof groove 302 is covered with a cloth cover, and the clamping shaft 17 passes through the cloth cover. The active bevel gear 16 controls the clamping shaft 17 to spread outward or move inward at the same time in both forward and reverse rotation modes. When all the clamping shafts 17 move outward at the same time, the structural parts can be clamped from the inside, which is convenient for the tool of the machine tool to process the outside of the structural parts. Although the assembly slider 19 starts to move outward, the rack plate 20 is limited by the damping wheel 2 1 is still in the slide slot 11, so the spur gear 18 starts to roll along the surface of the rack plate 20 for half a circle, and at the same time drives the clamping shaft 17 to rotate half a circle so that the shock absorbing rubber faces outward. When the spur gear 18 rolls to the end along the rack plate 20, the teeth of the spur gear 18 abut against the rack plate 20 and cannot continue to rotate. Finally, the thrust of the assembly slider 19 on the rack plate 20 overcomes the resistance of the damping wheel 21 on the rack plate 20, and the rack plate 20 moves synchronously with the movement of the assembly slider 19. When all the clamping shafts are 17 moves inwards at the same time, so as to clamp the structural part from the outside, which is convenient for the machine tool tool to process the inside of the structural part. At the same time, the clamping shaft 17 rotates half a circle to make the shock-absorbing rubber face inward. Therefore, no matter whether the clamping shaft 17 moves outward or inward, the shock-absorbing rubber will quickly adjust to the clamping side. All the clamping shafts 17 disperse the total clamping force. The shock-absorbing rubber further prevents damage to thin-walled structural parts and deformation of thin-walled structural parts, thereby realizing adaptive clamping of multiple contours.

[0032] The eddy current assembly includes a gear ring 28 and a plurality of sector-shaped magnetic plates 29. The sector-shaped magnetic plates 29 are arranged in the gear ring 28. The same side of every two adjacent sector-shaped magnetic plates 29 has opposite magnetic properties. A second servo motor 26 is arranged outside the outer cover 1. A driving gear 27 is installed on the second servo motor 26. The driving gear 27 is meshed with the gear ring 28 through a side groove 301. After machining, the operator removes the machined structural parts, and the second servo motor 26 is energized and drives the driving gear 27 to rotate. The driving gear 27 drives the gear ring 28 to rotate, and the gear ring 28 drives all the sector-shaped magnetic plates 29 to rotate. The magnetic flux lines generate induced eddy currents in the metal cutting chips generated by machining, and then generate an induced magnetic field that repels the sector-shaped magnetic plates 29. According to the principle of the eddy current separator, the cutting chips are repelled from the clamping device to achieve the cleaning of the metal cutting chips.

[0033] The working principle of the present invention is as follows: the operator first uses the control system to control the second electric push cylinder 14 to drive the large protrusion 13 to move according to the thickness of the structural part to be clamped, and drives the lifting assembly platform 9 to rise or fall through the two large protrusions 13, and adjusts the height of the clamping shaft 17 extending out of the surface of the outer cover body 1 so that the height of the clamping shaft 17 is adapted to the thickness of the structural part. Before the clamping shaft 17 moves, the control system first controls the first electric push cylinder 8 to push the elastic protrusion 7, and the elastic protrusion 7 drives the outer ring 4, the inner rotating block 5 and a plurality of side pressure fixing plates 6 to deflect a certain angle in the clamping cavity 2. After the movement and positioning of the clamping shaft 17 is completed, the first electric push cylinder 8 pulls the elastic protrusion 7 to reset, and the side pressure fixing plate 6 presses against the clamping shaft 17 from the side to further fix the clamping shaft 17, so that the clamping shaft 17 clamps the structural part more firmly.

[0034] After the height adjustment of the clamping shaft 17 is completed, the control system energizes the first servo motor 15 to work, the first servo motor 15 drives the active bevel gear 16 to rotate, the active bevel gear 16 drives all the driven bevel gears 30 to rotate, the driven bevel gears 30 drive the slot shaft 23 to rotate, the engaging strip 24 is embedded in the slot under the push of the spring 25, the rotation of the slot shaft 23 drives the screw sleeve 22 to rotate through the transmission of the engaging strip 24, the screw sleeve 22 drives the assembly slider 19 to slide along the sliding cavity 10 through the threaded transmission, drives the clamping shaft 17 to move, the clamping shaft 17 clamps the structural parts, because the contour shapes of the structural parts are not consistent, so it first contacts the structural parts. The clamping shaft 17 of the component is blocked, and the clamping shaft 17 that contacts the structure cannot move further after reaching a certain clamping force, so that the screw sleeve 22 cannot rotate. Although the groove shaft 23 is still rotating at this time, the engaging strip 24 overcomes the thrust of the spring 25 and retracts into the long slide groove. Finally, the engaging strip 24 disengages from the groove and continues to cross the groove. At this time, the rotation of the groove shaft 23 no longer continues to drive the corresponding clamping shaft 17 to move, while other clamping shafts 17 that have not contacted the structural parts can continue to move until they also contact the structural parts. After all the clamping shafts 17 complete the clamping of the structural parts, the first servo motor 15 stops rotating, and all the groove shafts 23 stop rotating.

[0035] The active bevel gear 16 controls the clamping shafts 17 to spread outward or move inward at the same time by forward and reverse rotation. When all the clamping shafts 17 move outward at the same time, the structural parts can be clamped from the inside, which is convenient for the tool of the machine tool to process the outside of the structural parts. Although the assembly slide block 19 starts to move outward, the rack plate 20 is still kept in the slide groove 11 by the damping wheel 21, so the spur gear 18 starts to roll half a circle along the surface of the rack plate 20, and at the same time drives the clamping shaft 17 to rotate half a circle to make the shock-absorbing rubber face outward. When the spur gear 18 rolls to the end along the rack plate 20, the teeth of the spur gear 18 press against the rack plate 20 and cannot continue to rotate, and finally the assembly The thrust of the slider 19 on the rack plate 20 overcomes the resistance of the damping wheel 21 on the rack plate 20, and the rack plate 20 moves synchronously with the movement of the assembly slider 19. When all the clamping shafts 17 move inward at the same time, the structural parts can be clamped from the outside, which is convenient for the machine tool tool to process the inside of the structural parts. At the same time, the clamping shaft 17 rotates half a circle to make the shock-absorbing rubber face inward. Therefore, no matter whether the clamping shaft 17 moves outward or inward, the shock-absorbing rubber will quickly adjust to the clamping side. All the clamping shafts 17 disperse the total clamping force. The shock-absorbing rubber further prevents damage to thin-walled structural parts, prevents deformation of thin-walled structural parts, and realizes adaptive clamping of multiple contours.

[0036] After machining is completed, the operator removes the machined structural parts, the second servo motor 26 is energized and drives the drive gear 27 to rotate, the drive gear 27 drives the gear ring 28 to rotate, the gear ring 28 drives all the fan-shaped magnetic plates 29 to rotate, and the magnetic lines of force generate induced eddy currents in the metal cutting chips generated by machining, and then generate induced magnetic fields to repel the fan-shaped magnetic plates 29. According to the principle of the eddy current separator, the cutting chips are repelled from the clamping device to achieve the cleaning of the metal cutting chips.

[0037] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device.

[0038] Finally, it should be noted that the above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art can still modify the technical solutions described in the aforementioned embodiments or replace some of the technical features therein by equivalents. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A clamping device for CNC machining of micro precision thin-walled metal structural parts, characterized in that: The invention comprises an outer cover (1), a lifting assembly platform (9) is slidably mounted inside the outer cover (1), an eddy current component is rotatably mounted at the bottom of the outer cover (1), a mounting foot is mounted on the outer side of the bottom of the outer cover (1), the outer cover (1) is fixed to a machine tool via the mounting foot and bolts, a plurality of groups of clamping components are arranged inside the lifting assembly platform (9), the plurality of groups of clamping components are evenly distributed in a circular shape, each group of clamping components penetrates the outer cover (1) to clamp a workpiece, and the eddy current component cleans cutting chips on the clamping device; The outer cover (1) has a clamping cavity (2) formed inside, and a plurality of dustproof grooves (302) are formed through the outer cover (1) from top to bottom. The lifting assembly platform (9) has a plurality of sliding cavities (10) formed inside, and a sliding plate groove (11) is formed on the side wall of each sliding cavity (10). Each group of the clamping components comprises an assembly slider (19), a clamping shaft (17), a spur gear (18) and a rack plate (20); the assembly slider (19) is slidably mounted in the slide cavity (10); the clamping shaft (17) and the spur gear (18) are coaxially arranged; the spur gear (18) is rotatably mounted inside the assembly slider (19); the rack plate (20) is slidably mounted in the slide groove (11); a damping wheel (21) is mounted on a side of the rack plate (20) that contacts the slide groove (11); the rack plate (20) and the assembly slider (19) are in slidable contact; the rack plate (20) and the spur gear (18) are meshed; the clamping shaft (17) passes through the dustproof groove (302); half of the surface of each clamping shaft (17) is wrapped with a shock-absorbing rubber; each dustproof groove (302) is covered with a cloth cover; the clamping shaft (17) passes through the cloth cover; Each group of the clamping components further comprises a screw sleeve (22), a grooved shaft (23) and a plurality of engaging strips (24); a screw hole is provided at the bottom of the assembly slide block (19); the grooved shaft (23) is rotatably mounted in the slide cavity (10); the screw sleeve (22) is sleeved outside the grooved shaft (23); the screw sleeve (22) is threadedly connected to the screw hole; a driven bevel gear (30) is coaxially mounted on one side of the grooved shaft (23); the driven bevel gear (30) is located in the middle chamber (12); a driving bevel gear (16) is rotatably arranged in the middle chamber (12); the driving bevel gear (16) is meshedly connected with all the driven bevel gears (30); a first servo motor (15) is provided at the bottom of the lifting assembly platform (9); the first servo motor (15) is coaxially connected with the driving bevel gear (16); The screw sleeve (22) has a plurality of long slide grooves evenly distributed in an annular shape inside, and a plurality of engaging strips (24) are respectively arranged in the long slide grooves. A plurality of springs (25) are connected between each engaging strip (24) and the long slide groove, and a engaging groove matching the engaging strip (24) is formed on the surface of the groove shaft (23).

2. A clamping device for CNC machining of micro-precision thin-walled metal structural parts according to claim 1, characterized in that: The number and arrangement of the dustproof grooves (302) are the same as those of the clamping assembly; the dustproof grooves (302) are in communication with the clamping cavity (2); and three side grooves (301) are also provided on the side surface of the outer cover body (1); the three side grooves (301) are arranged in sequence at right angles.

3. A clamping device for CNC machining of micro-precision thin-walled metal structural parts according to claim 2, characterized in that: A pair of large protrusions (13) are symmetrically arranged on the outside of the lifting assembly platform (9), and the two large protrusions (13) are slidably arranged in symmetrically arranged side grooves (301). A pair of second electric push cylinders (14) are installed on the outside of the outer cover (1) through a bracket, and the telescopic rods of the two second electric push cylinders (14) are respectively connected to the two large protrusions (13), and the two second electric push cylinders (14) are connected to a control system through a circuit; A clamping assembly is provided in each of the sliding cavities (10), and a middle chamber (12) is provided in the middle of the lifting assembly platform (9), wherein the middle chamber (12) is communicated with each of the sliding cavities (10).

4. The clamping device for CNC machining of micro-precision thin-walled metal structural parts according to claim 2, characterized in that: An outer ring (4), an inner rotating block (5), a plurality of side pressure fixing plates (6) and an elastic protrusion (7) are arranged in the clamping cavity (2); the outer ring (4) and the inner rotating block (5) are rotatably arranged in the clamping cavity (2); a side pressure fixing plate (6) is arranged on one side of each dustproof groove (302); a plurality of side pressure fixing plates (6) are connected between the outer ring (4) and the inner rotating block (5); the elastic protrusion (7) is arranged on the outside of the outer ring (4); the elastic protrusion (7) extends out of a side groove (301); a first electric push cylinder (8) is installed on the outside of the outer cover body (1); a piston rod of the first electric push cylinder (8) is rotatably connected to the elastic protrusion (7).

5. The clamping device for CNC machining of micro-precision thin-walled metal structural parts according to claim 1, characterized in that: The eddy current assembly comprises a gear ring (28), a plurality of sector-shaped magnetic plates (29), the plurality of sector-shaped magnetic plates (29) being arranged in the gear ring (28), the same surface of every two adjacent sector-shaped magnetic plates (29) having opposite magnetic properties, a second servo motor (26) being arranged outside the outer cover (1), a driving gear (27) being mounted on the second servo motor (26), and the driving gear (27) being meshed with the gear ring (28) via a side groove (301).

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