PTFE material printed board hole burr removing device and method

Abstract

A kind of PTFE material printed board hole burr removal device and method, including lifting mechanism, rotating mechanism is installed on lifting mechanism, lifting mechanism is equipped on the output of two-dimensional linear XY translation table, to make lifting mechanism move in plane, lifting mechanism is used to drive rotating mechanism to move in Z direction, rotating mechanism is equipped with first removal piece, the lower end of first removal piece is equipped with second removal piece, first removal piece is used to remove the burr of the inner wall of hole with diameter greater than 2mm, second removal piece is used to remove the burr of the inner wall of hole with diameter less than 2mm, and the method for removing burr in hole by the device, the control of removal process is carried out by first automatic control system, to improve the efficiency and automation degree when removing burr in hole.The second burr processing mode of the present application is through two sets of schemes, to select reasonable removal mode for hole size, to ensure that burr removal can be completely and thoroughly completed.

Description

Technical Field

[0001] This invention relates to printed circuit board processing, and more particularly to a device and method for removing burrs from holes in PTFE printed circuit boards. Background Technology

[0002] PTFE, short for polytetrafluoroethylene, is widely used as a dielectric material in printed circuit boards due to its excellent dielectric properties. However, because this material is relatively soft, during drilling, the drill bit often fails to cut through the material fibers, resulting in burrs inside the hole. Due to the inherent characteristics of the material, there is almost no good method to completely eliminate the burr problem of PTFE, and existing methods of direct scraping have the problem of poor cleaning effect and incomplete cleaning. Summary of the Invention

[0003] This invention provides a device and method for removing burrs inside holes of PTFE printed circuit boards, which overcomes the shortcomings of the prior art and solves the problem of inconvenient removal of burrs inside holes of printed circuit boards made of PTFE material, and has strong practicality.

[0004] In order to achieve the objectives of this invention, the following technologies are proposed: A PTFE printed circuit board hole burr removal device includes a lifting mechanism and a rotating mechanism mounted on the lifting mechanism. The lifting mechanism is located on the output end of a two-dimensional linear XY translation stage to allow the lifting mechanism to move in a plane. The lifting mechanism is used to drive the rotating mechanism to move in the Z direction. The rotating mechanism is provided with a first removal component and a second removal component at the lower end of the first removal component. The first removal component is used to remove burrs on the inner wall of holes with a diameter greater than 2 mm, and the second removal component is used to remove burrs on the inner wall of holes with a diameter less than 2 mm.

[0005] Furthermore, the two-dimensional linear XY translation stage, lifting mechanism and rotating mechanism are connected to the automatic control system. The automatic control system stores the design drawings of the printed circuit board to be processed. The automatic control system is used to control the X, Y and Z positions of the first removal part and the second removal part, and is connected to the gas control valve to control the start and stop of gas ejection.

[0006] Furthermore, the lifting mechanism includes a back plate fixed to the output end of a two-dimensional linear XY translation stage. A pair of guide rails are mounted on the back plate, and a slider is slidably mounted on the guide rails. A lifting plate is mounted on the slider by bolts. A nut is mounted on the inner end of the lifting plate by bolts. A lead screw is threaded into the nut. Bearing seats are rotatably mounted at both ends of the lead screw. The bearing seats are mounted on the back plate by screws. A motor is connected to one end of the lead screw by a coupling. The motor is fixed to the back plate by bolts and a mounting seat.

[0007] Furthermore, the rotating mechanism includes a rotating motor that is bolted to the lifting plate. The output shaft of the rotating motor is connected to a rotating shaft. A rotating cover is formed at the lower end of the rotating shaft. A first circular groove is formed at the bottom of the rotating cover. Multiple connecting holes are formed on the periphery of the rotating cover. Multiple vertical retaining strips are formed on the inner periphery of the rotating cover. The inner ends of the connecting holes extend into the first circular groove.

[0008] Further, the first removal component includes a rod inserted into a first circular groove. A radial screw is threaded onto the rod, with its outer end passing through a connecting hole. A cap is formed at the lower end of the rod, and a tube is threaded onto the inside of the cap. An upper through hole and a lower through hole are formed on the circumference of the tube, with the upper through hole located above the lower through hole. An upper ring is fixed to the upper end of the tube, and a lower ring is provided below the upper ring. The lower ring is fixed to the inner circumference of the tube. A movable disc is movably disposed between the upper and lower rings, located within the tube. A convex ring is formed at the upper end of the movable disc, with its inner circumference having a conical structure. The upper diameter of the conical structure of the convex ring is larger than its lower diameter. A conical wall is formed on the outer circumference of the lower end of the upper ring. The outer diameter is larger than the diameter of its lower end. Multiple first channels are formed on the movable disk. One end of the first channel penetrates the upper wall of the movable disk, and the other end of the first channel penetrates the outer periphery of the movable disk. The first channel corresponds one-to-one with the upper through hole and the lower through hole. An inner convex ring is formed on the inner wall of the tube. The upper end of the inner convex ring has a conical structure. The diameter of the upper end of the conical structure of the inner convex ring is larger than the diameter of its lower end. A connecting ring is connected to the lower end of the tube by a thread. A lower ring is formed at the lower end of the connecting ring. The lower ring has an annular cavity inside. Multiple inner connecting holes are opened on the inner periphery of the lower ring, and the inner connecting holes communicate with the annular cavity. Multiple outer connecting holes are opened on the outer periphery of the lower ring, and the outer connecting holes communicate with the annular cavity. A rubber ring is sealed and fixed on the outer wall of the lower ring. The upper end of the tube is connected to a first air pipe, the upper end of the first air pipe is connected to a lower universal valve, the upper end of the tube is also connected to a second air pipe, the upper end of the second air pipe is connected to an upper universal valve, the upper universal valve is fixed to the lifting plate, the lower universal valve is fixed to the lower end of the upper universal valve, the rotating shaft passes through the upper universal valve and the lower universal valve, the inner end of the second air pipe passes through the movable disc and extends downward, the movable disc moves on the second air pipe, and the inner end of the first air pipe extends into the inside of the tube. The lower end of the tube body is equipped with a movable cover. The upper end of the movable cover has a second circular groove formed with an opening. The upper end of the outer periphery of the movable cover is formed with a stop flange. The lower end face of the stop flange has a conical structure. The upper diameter of the conical structure of the stop flange is larger than its lower diameter. Multiple outward discharge holes are opened on the lower periphery of the movable cover. A connecting rod is formed at the lower end of the movable cover. When air is introduced into the tube through the first trachea, the external exhaust hole and the internal connecting hole are connected, so that air enters the rubber ring through the external exhaust hole, the internal connecting hole, the annular cavity, and the external connecting hole. The conical structure of the stop convex edge abuts against the conical structure of the inner convex ring, the upper end face of the movable disk abuts against the lower wall of the upper ring, and the inner circumference of the convex ring abuts against the conical wall of the upper ring. The first channel is connected to its corresponding upper through hole. When no air enters the first trachea, the lower end of the movable disc contacts the upper end face of the lower ring, and the first channel connects with its corresponding lower through hole. The lower end of the connecting rod is threadedly connected to a tapered column. The outer circumference of the tapered column is conical, and the diameter of the lower end of the conical surface is smaller than the diameter of the upper end. A push post is located at the lower end of the tapered column, and an upper push spring is located at the lower end of the push post. A lower end ring is sealed and fixed at the lower end of the lower ring. A middle partition ring is formed on the inner circumference of the lower end ring. An inner shell is threadedly connected to the inner circumference of the middle partition ring. The lower end of the upper push spring abuts against the lower inner end of the inner shell, and the upper push spring is located inside the inner shell. The tapered column moves axially above the middle partition ring. Multiple pairs of guide holes are opened on the middle partition ring, and a guide spring is inserted into each guide hole. Each pair of moving rods has a lower moving plate connected to its lower end via a threaded connection. The lower moving plate is located below the central partition ring. A lower convex plate is formed on the lower moving plate, and an inner top spring is fixed on the lower convex plate. The outer end of the inner top spring abuts against the inner circumference of the lower end ring. Each pair of moving rods has an outer push block connected to its upper end via a threaded connection. The inner circumference of the outer push block is formed with a conical arc wall. The conical surface of the conical column acts on the inner circumference of the conical arc wall. The outer end of the outer push block has an open groove. The inside of the groove has protruding strips on both sides. A scraper passes through the groove and is positioned on the circumference of the lower end ring. The protruding strips are engaged with the scraper on both sides.

[0009] Furthermore, a lower cover plate is fixed to the lower end of the lower ring, and a lower extension tube is formed on the lower wall of the lower cover plate. Multiple umbrella-shaped rings are formed on the outer periphery of the lower extension tube. The diameter of the lower end of the umbrella-shaped ring is larger than the diameter of its upper end, and the outer diameter of the umbrella-shaped ring increases sequentially from bottom to top. An inner cavity is formed inside the lower extension tube, and an air outlet is connected to the lower end of the inner cavity. Conical holes are formed at both ends of the air outlet. The diameter of the lower end of the conical hole located at the upper end is smaller than the diameter of its upper end, and the diameter of the lower end of the conical hole located at the lower end is larger than the diameter of its upper end. A duct is connected to the upper end of the lower extension tube. One end of the duct is connected to the inner cavity, and the other end of the duct is connected to the lower through hole.

[0010] The advantages of the above technical solution are: This invention first uses an automatic control system to control the removal process, thereby improving the efficiency and automation of burr removal inside holes.

[0011] The present invention further employs two methods for burr removal, selecting a suitable removal method based on the pore size to ensure complete and thorough burr removal.

[0012] This invention removes burrs by first hardening and embrittlement with dry ice, then scraping them off. During the sublimation process, the dry ice creates micro-vibrations within the hole, removing burrs with weaker connections. Some burrs, due to their thicker roots, remain on the inner wall of the hole and are subsequently removed by scraping. Furthermore, this invention removes burrs hole-by-hole, improving thoroughness while reducing the amount of dry ice used. It also avoids large-area contact between dry ice and the printed circuit board, which could increase the board's brittleness and cause breakage during disassembly. Attached Figure Description

[0013] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will now be described in further detail with reference to the accompanying drawings.

[0014] Figure 1 A three-dimensional structural diagram of a device for removing burrs inside holes of a PTFE printed circuit board is shown.

[0015] Figure 2 A three-dimensional structural diagram of the lifting mechanism is shown.

[0016] Figure 3 A three-dimensional structural diagram of the rotating mechanism is shown.

[0017] Figure 4 A three-dimensional structural diagram and a cross-sectional structural diagram of the first and second removal components are shown.

[0018] Figure 5 A three-dimensional structural view and a cross-sectional structural view of the lower part of the first and second removal components are shown.

[0019] Figure 6 A three-dimensional structural diagram of the lower part of the first removal component is shown.

[0020] Figure 7 A three-dimensional structural diagram of a positioning fixture for removing burrs from holes in a PTFE printed circuit board is shown. Detailed Implementation

[0021] like Figure 1 As shown, a PTFE printed circuit board hole burr removal device includes a lifting mechanism 1, a rotating mechanism 2 mounted on the lifting mechanism 1, and the lifting mechanism 1 is located on the output end of a two-dimensional linear XY translation stage to allow the lifting mechanism 1 to move in the plane. The lifting mechanism 1 is used to drive the rotating mechanism 2 to move in the Z direction. The rotating mechanism 2 is provided with a first removal component 3, and a second removal component 4 is provided at the lower end of the first removal component 3. The first removal component 3 is used to remove burrs on the inner wall of holes with a diameter greater than 2 mm, and the second removal component 4 is used to remove burrs on the inner wall of holes with a diameter less than 2 mm.

[0022] The two-dimensional linear XY translation stage, lifting mechanism 1 and rotating mechanism 2 are connected to the automatic control system. The automatic control system stores the design drawings of the printed circuit board to be processed. The automatic control system is used to control the X, Y and Z positions of the first removal component 3 and the second removal component 4, and is connected to the gas control valve to control the start and stop of gas ejection.

[0023] The two-dimensional linear XY translation stage is mainly composed of two mutually perpendicular lead screws, each of which is connected to a motor, and the motor is connected to an absolute encoder.

[0024] like Figure 2 As shown, the lifting mechanism 1 includes a back plate 10 fixed to the output end of a two-dimensional linear XY translation stage. A pair of guide rails 11 are mounted on the back plate 10. A slider 12 is slidably mounted on the guide rails 11. A lifting plate 13 is mounted on the slider 12 by bolts. A nut 14 is mounted on the inner end of the lifting plate 13 by bolts. A lead screw 15 is threadedly connected to the nut 14. Bearing seats 17 are rotatably mounted at both ends of the lead screw 15. The bearing seats 17 are mounted on the back plate 10 by screws. A motor 16 is connected to one end of the lead screw 15 by a coupling. The motor 16 is fixed to the back plate 10 by bolts and a mounting seat. When the lifting mechanism 1 controls the movement of the lifting plate 13, the motor 16 drives the lead screw 15 to rotate, so that the nut 14 and the lifting plate 13 move up and down along the length of the guide rails 11.

[0025] like Figure 3 As shown, the rotating mechanism 2 includes a rotating motor 20 that is bolted to the lifting plate 13. The output shaft of the rotating motor 20 is connected to a rotating shaft 21. A rotating cover 22 is formed at the lower end of the rotating shaft 21. A first circular groove 24 is provided at the bottom of the rotating cover 22. Multiple connecting holes 23 are provided on the periphery of the rotating cover 22. Multiple vertical retaining strips 25 are formed on the inner periphery of the rotating cover 22. The inner end of the connecting hole 23 extends into the first circular groove 24. When the rotating shaft 21 rotates, it is driven to rotate by the rotating motor 20.

[0026] like Figures 4 to 6As shown, the first removal component 3 includes a rod 300 inserted into the first circular groove 24. A radial screw 302 is threaded onto the rod 300. The outer end of the radial screw 302 passes through the connecting hole 23. A cover 301 is formed at the lower end of the rod 300. Multiple embedded vertical grooves 315 are provided on the outer periphery of the cover 301. A vertical retaining strip 25 passes through the embedded vertical grooves 315, which can ensure the connection stability between the rotating shaft 21 and the cover 301. The inside of the cover 301 is connected to the tube body 307 by threads. The tube body 307 has an upper through hole 316 and a lower through hole 318 on its circumference. The upper through hole 316 is located above the lower through hole 318. An upper ring 308 is fixed to the upper end of the tube body 307. A lower ring 310 is provided below the upper ring 308 and is fixed to the inner circumference of the tube body 307. A movable disc 309 is movably provided between the upper ring 308 and the lower ring 310. The movable disc 309 is located inside the tube body 307. A convex ring is formed at the upper end of the movable disc 309. The inner circumference of the convex ring has a conical structure. The upper diameter of the conical structure of the convex ring is larger than the lower diameter. A conical wall is formed on the lower outer circumference of the upper ring 308. The outer diameter of the upper end of the conical wall of the upper ring 308 is larger than the lower diameter. The conical structure design of the conical wall and the convex ring is to improve the sealing effect between the movable disc 309 and the upper ring 308. Multiple first channels 317 are formed on the movable disc 309. One end of the first channel 317 penetrates the upper wall of the movable disc 309, and the other end of the first channel 317 penetrates the outer periphery of the movable disc 309. The first channels 317 correspond one-to-one with the upper through holes 316 and the lower through holes 318. An inner convex ring 311 is formed on the inner wall of the tube body 307. The upper end of the inner convex ring 311 has a conical structure, and the diameter of the upper end of the conical structure of the inner convex ring 311 is larger than the diameter of its lower end. A connecting ring 33 is threadedly connected to the lower end of the tube body 307. 9. The lower end of the connecting ring 339 is formed with a lower ring 321. The interior of the lower ring 321 has an annular cavity 323. Multiple inner connecting holes 322 are opened on the inner circumference of the lower ring 321, and the inner connecting holes 322 communicate with the annular cavity 323. Multiple outer connecting holes 324 are opened on the outer circumference of the lower ring 321, and the outer connecting holes 324 communicate with the annular cavity 323. A rubber ring 325 is sealed and fixed on the outer wall of the lower ring 321. The rubber ring 325 is designed to facilitate the cleaning of burrs by close contact, and has the advantages of comprehensiveness and thoroughness in cleaning.

[0027] The upper end of the tube body 307 is connected to a first air pipe 305, the upper end of the first air pipe 305 is connected to a lower universal valve 304, the upper end of the tube body 307 is also connected to a second air pipe 306, the upper end of the second air pipe 306 is connected to an upper universal valve 303, the upper universal valve 303 is fixed on the lifting plate 13, the lower universal valve 304 is fixed to the lower end of the upper universal valve 303, the rotating shaft 21 passes through the upper universal valve 303 and the lower universal valve 304, the inner end of the second air pipe 306 passes through the movable plate 309 and extends downward, the movable plate 309 moves on the second air pipe 306, and the inner end of the first air pipe 305 extends into the tube body 307.

[0028] The lower end of the tube body 307 is provided with a movable cover 312. The upper end of the movable cover 312 is formed with a second circular groove. The upper end of the outer periphery of the movable cover 312 is formed with a stop flange 319. The lower end face of the stop flange 319 is conical. The upper diameter of the conical structure of the stop flange 319 is larger than its lower diameter. Multiple external discharge holes 320 are opened on the lower periphery of the movable cover 312. The lower end of the movable cover 312 is formed with a connecting rod 313.

[0029] When air is introduced into the tube body 307 through the first air pipe 305, the outer exhaust hole 320 and the inner connecting hole 322 are connected, allowing air to enter the rubber ring 325 through the outer exhaust hole 320, the inner connecting hole 322, the annular cavity 323, and the outer connecting hole 324. The conical structure of the stop flange 319 abuts against the conical structure of the inner convex ring 311 to improve the sealing effect. The upper end face of the movable disc 309 abuts against the lower wall of the upper ring 308, and the inner circumference of the convex ring abuts against the conical wall of the upper ring 308 to improve the sealing effect. The first channel 317 is connected to its corresponding upper through hole 316.

[0030] When no air enters the first air tube 305, the lower end of the movable plate 309 contacts the upper end face of the lower ring 310, and the first channel 317 is connected to its corresponding lower through hole 318.

[0031] The lower end of the connecting rod 313 is threadedly connected to a tapered column 314. The outer circumference of the tapered column 314 is conical, and the diameter of the lower end of the conical surface of the tapered column 314 is smaller than the diameter of its upper end. A pusher column 326 is provided at the lower end of the tapered column 314, and an upper pusher spring 328 is provided at the lower end of the pusher column 326. The lower end of the lower ring 321 is sealed and fixed with a lower end ring 331. A middle partition ring 327 is formed on the inner circumference of the lower end ring 331. An inner shell 329 is threadedly connected to the inner circumference of the middle partition ring 327. The lower end of the upper pusher spring 328 abuts against the lower end of the inner shell 329, and the upper pusher spring 328 is located inside the inner shell 329. The tapered column 314 moves axially above the middle partition ring 327. Multiple pairs of guide holes 333 are provided on the middle partition ring 327, and a movable part passes through the guide holes 333. Each pair of moving rods 334 has a lower moving plate 335 connected to its lower end by a threaded connection. The lower moving plate 335 is located below the middle partition ring 327. A lower protruding plate 332 is formed on the lower moving plate 335. An inner top spring 330 is fixed on the lower protruding plate 332. The outer end of the inner top spring 330 abuts against the inner circumference of the lower end ring 331. Each pair of moving rods 334 has an outer push block 336 connected to its upper end by a threaded connection. A conical arc wall 337 is formed on the inner circumference of the outer push block 336. The conical surface of the conical column 314 acts on the inner circumference of the conical arc wall 337. A slot is formed with an opening on the outer end of the outer push block 336. A protruding strip 338 is formed on both sides of the inside of the slot. A scraper 340 passes through the slot and passes through the circumference of the lower end ring 331. The protruding strip 338 is engaged on both sides of the scraper 340. When air is injected into the movable cover 312, the conical column 314 will move downwards, and the upper spring 328 will be compressed. During the downward movement of the conical column 314, the conical surface of the conical column 314 acts on the inner circumference of the conical arc wall 337, thereby causing the outer push block 336 and the scraper 340 to move outwards. At the same time, the scraper 340 extends out of the lower end ring 331, and the distance between its outer end and the center of the lower end ring 331 is equal to the diameter of the corresponding hole. When the outer push block 336 moves, the inner spring 330 is also compressed. When the movable cover 312 loses the effect of air, the upper spring 328 causes the conical column 314 to return to its initial position, and the scraper 340 will retract under the action of the inner spring 330.

[0032] like Figure 5As shown, a lower cover plate 400 is fixed to the lower end of the lower ring 331. A lower extension tube 401 is formed on the lower wall of the lower cover plate 400. Multiple umbrella-shaped rings 402 are formed on the outer periphery of the lower extension tube 401. The diameter of the lower end of the umbrella-shaped ring 402 is larger than the diameter of its upper end, and the outer diameter of the umbrella-shaped ring 402 increases sequentially from bottom to top. The umbrella-shaped rings 402 are designed to facilitate the removal of burrs from different holes and facilitate the discharge of burrs during the removal process. The lower extension tube 401 has an inner cavity 404 formed inside. The lower end of the inner cavity 404 is connected to an air outlet 405. The two ends of the air outlet 405 are respectively formed with conical holes. The diameter of the lower end of the conical hole located at the upper end is smaller than the diameter of the upper end, and the diameter of the lower end of the conical hole located at the lower end is larger than the diameter of the upper end. The upper end of the lower extension tube 401 is connected to a duct 403. One end of the duct 403 is connected to the inner cavity 404, and the other end of the duct 403 is connected to the lower through hole 318.

[0033] Example 2 like Figure 7 As shown, a positioning fixture for removing burrs inside holes of a PTFE printed circuit board includes a worktable 5. The lower wall of the worktable 5 is formed with a ring frame 51. Four pairs of oblong holes 50 are arranged in a circular array around the geometric center of the worktable 5. Connecting screws 52 are inserted into the oblong holes 50. The upper end of each pair of connecting screws 52 is threadedly connected to a positioning block 53. The upper inner side of the positioning block 53 is formed with an inner protruding clamping plate 54. The lower end of each pair of connecting screws 52 is threadedly connected to a lower moving plate 57. The lower moving plate 57 is located on the lower side of the worktable 5. A support frame 50 is provided at the upper end of the worktable 5. An embedded annular groove 51 is provided at the upper end of the support frame 50.

[0034] Example 3 A method for removing burrs from the holes of a PTFE printed circuit board includes the following steps: Step 01: Place the printed circuit board made of PTFE material to be processed on the support frame 50 of the workbench 5. When placing it, the printed circuit board 6 is embedded in the inner ring groove 51 of the support frame 50. Step 02: Rotate the connecting screw 52 according to the thickness of the printed circuit board 6 to adjust the height of the inner convex plate 54; Step 03: Move the inner convex plate 54 on the positioning block 53 inward so that the inner convex plate 54 is above the printed circuit board 6, and rotate the connecting screw 52 so that the lower wall of the inner convex plate 54 acts on the upper wall of the printed circuit board 6. Step 04: Import the design drawings of the printed circuit board to be processed into the computer with an automatic control system. The design drawings contain the geometric coordinate information of the holes on the printed circuit board, the diameter of the holes, and the depth of the holes. Step 05: Start the automatic control system and control the two-dimensional linear XY translation stage to move the lifting mechanism 1 so that the first removal part 3 is located directly above the positioning hole of the printed circuit board 6. Step 06: The automatic control system controls the first removal component 3 to move along a predetermined trajectory to each hole of the printed circuit board 6 according to the geometric coordinate information of the holes on the printed circuit board 6. Step 07: The automatic control system controls the lifting mechanism 1 to move downward according to the diameter and depth of the hole; If the diameter of the hole is greater than 2mm, the lifting mechanism 1 drives the second removal component 4 through the corresponding hole, and the scraper 340 and the rubber ring 325 are located below the corresponding hole. The automatic control system controls the air intake pump so that air enters the movable disc 309, pipe body 307 and movable cover 312 through the lower universal valve 304 and the second air pipe 306, so that the movable disc 309 moves upward and the movable cover 312 moves downward. When the movable disc 309 moves upward, the upper end face of the movable disc 309 abuts against the lower wall of the upper ring 308, and the inner circumference of the convex ring abuts against the conical wall of the upper ring 308. The first channel 317 is connected to its corresponding upper through hole 316. After the movable cover 312 moves into place, the outer exhaust hole 320 and the inner connecting hole 322 are connected so that air enters the rubber ring 325 through the outer exhaust hole 320, the inner connecting hole 322, the annular cavity 323 and the outer connecting hole 324, so that the outer diameter of the rubber ring 325 is larger than the inner diameter of the corresponding hole. As the conical column 314 moves downward, the outer push block 336 moves outward and the scraper 340 moves out. The automatic control system controls dry ice with a temperature less than -78.5℃ to enter the upper end of the tube body 307 through the lower universal valve 304 and the first air pipe 305, so that the dry ice is sprayed outward through the first channel 317 and the corresponding upper through hole 316 onto the inner wall of the printed circuit board 6, and the dry ice is in contact with the inner wall of the hole for more than 2 seconds, so that the hardness and brittleness of the burrs on the inner wall of the hole increases. During the duration, the dry ice absorbs heat and sublimates. During the sublimation process, the dry ice particles will expand and collide with each other, thereby generating micro-explosion force to remove the small burrs in the hole. After that, the filling of the hole with dry ice particles stops. The automatic control system controls the lifting mechanism 1 to move the rubber ring 325 upward, so that the outer periphery of the rubber ring 325 acts on the root of the burrs that have not been removed or part of the burrs, so that the burrs are removed from the hole. During the process of the automatic control system controlling the lifting mechanism 1 to move the rubber ring 325 upward, the rotating motor 20 drives the rotating shaft 21 and the scraper 340 to rotate, so that the scraper 340 acts on some of the burrs that have not been removed, thereby removing them from the hole. If the diameter of the hole is less than 2mm, the lifting mechanism 1 drives the lower extension tube 401 of the second removal part 4 to pass into the corresponding hole; The automatic control system controls dry ice with a temperature less than -78.5℃ to enter the upper end of the tube body 307 through the lower universal valve 304 and the first air pipe 305. At this time, the lower end of the movable disc 309 contacts the upper end face of the lower ring 310. After that, dry ice microparticles are sprayed out through the first channel 317 and its corresponding lower through hole 318, air guide pipe 403, inner cavity 404 and air outlet 405, and fill into the corresponding holes so as to freeze and embrittle the burrs through the dry ice, and remove the burrs with the micro-vibration generated when the dry ice sublimates. The dry ice is stopped after it has been introduced for 2 seconds. The automatic control system controls the lifting mechanism 1 to drive the lower extension tube 401 to reciprocate up and down. During the movement, the outer edge of the umbrella-shaped ring 402 acts on the inner wall of the hole to remove burrs. Step 08: Complete the removal of all burrs on the inner wall of the hole through the automatic control system. After removal, cancel the positioning of the printed circuit board 6 and take out the printed circuit board 6.

[0035] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Obviously, those skilled in the art can make various modifications and variations to the present invention without departing from the spirit and scope of the present invention. Thus, if these modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention also intends to include these modifications and variations.

Claims

1. A device for removing burrs from holes in PTFE printed circuit boards, characterized in that, Includes a lifting mechanism (1), on which a rotating mechanism (2) is installed. The lifting mechanism (1) is located on the output end of a two-dimensional linear XY translation stage so that the lifting mechanism (1) can move in the plane. The lifting mechanism (1) is used to drive the rotating mechanism (2) to move in the Z direction. The rotating mechanism (2) is provided with a first removal component (3). The lower end of the first removal component (3) is provided with a second removal component (4). The first removal component (3) is used to remove burrs on the inner wall of holes with a diameter greater than 2 mm. The second removal component (4) is used to remove burrs on the inner wall of holes with a diameter less than 2 mm. The rotating mechanism (2) includes a rotating motor (20) that is bolted to the lifting plate (13). The output shaft of the rotating motor (20) is connected to a rotating shaft (21), and a rotating cover (22) is formed at the lower end of the rotating shaft (21). The first removal component (3) includes a snap cover (301) inserted into the rotating cover (22). The snap cover (301) is connected to a tube body (307). A ring of upper through holes (316) and a ring of lower through holes (318) are opened on the periphery of the tube body (307). An upper ring (308) is fixed at the upper end of the tube body (307). A lower ring (310) is provided below the upper ring (308). The lower ring (310) is fixed on the inner periphery of the tube body (307). A movable disc (309) is movably provided between the upper ring (308) and the lower ring (310). A plurality of first channels (317) are formed on the movable disc (309). The first channels (317) and The upper through hole (316) and the lower through hole (318) are in a one-to-one correspondence. The lower end of the tube body (307) is connected to a connecting ring (339). The lower end of the connecting ring (339) is formed with a lower ring (321). The lower ring (321) has an annular cavity (323) inside. Multiple inner connecting holes (322) are opened on the inner circumference of the lower ring (321). The inner connecting holes (322) are connected to the annular cavity (323). Multiple outer connecting holes (324) are opened on the outer circumference of the lower ring (321). The outer connecting holes (324) are connected to the annular cavity (323). A rubber ring (325) is sealed and fixed on the outer wall of the lower ring (321). The upper end of the tube body (307) is connected to a first air tube (305), the upper end of the first air tube (305) is connected to a lower universal valve (304), the upper end of the tube body (307) is also connected to a second air tube (306), the upper end of the second air tube (306) is connected to an upper universal valve (303). The lower end of the tube body (307) is provided with a movable cover (312), and the lower end of the periphery of the movable cover (312) is provided with multiple external discharge holes (320). The lower end of the movable cover (312) is connected to a conical column (314). The outer circumference of the conical column (314) is conical, and the diameter of the lower end of the conical surface of the conical column (314) is smaller than the diameter of its upper end. The lower end of the conical column (314) is provided with a push column (326). Multiple pairs of guide holes (333) are opened on the middle partition ring (327). A moving rod (334) is inserted in the guide hole (333). Each pair of moving rods (334) is connected to a lower... The moving plate (335) is located below the middle partition ring (327). Each pair of moving rods (334) is connected to an outer push block (336). The inner circumference of the outer push block (336) is formed with a conical arc wall (337). The conical surface of the conical column (314) acts on the inner circumference of the conical arc wall (337). The outer push block (336) is provided with a scraper (340). The scraper (340) passes through the circumference of the lower end ring (331).

2. The PTFE material printed circuit board hole deburring device according to claim 1, characterized in that, The two-dimensional linear XY translation stage, lifting mechanism (1) and rotating mechanism (2) are connected to the automatic control system. The automatic control system stores the design drawings of the printed circuit board to be processed. The automatic control system is used to control the X, Y and Z positions of the first removal part (3) and the second removal part (4), and is connected to the gas control valve to control the start and stop of gas ejection.

3. The PTFE material printed circuit board hole deburring device according to claim 1, characterized in that, The lifting mechanism (1) includes a back plate (10) fixed on the output end of the two-dimensional linear XY translation stage. A pair of guide rails (11) are installed on the back plate (10). A slider (12) is slidably provided on the guide rails (11). A lifting plate (13) is installed on the slider (12) by bolts. A nut (14) is installed on the inner end of the lifting plate (13) by bolts. A screw (15) is connected to the nut (14) by threads. Bearing seats (17) are rotatably provided at both ends of the screw (15). The bearing seats (17) are installed on the back plate (10) by screws. A motor (16) is connected to one end of the screw (15) by a coupling. The motor (16) is fixed on the back plate (10) by bolts and mounting base.

4. The PTFE material printed circuit board hole deburring device according to claim 1, characterized in that, When air is filled into the tube body (307) through the first air tube (305), the outer exhaust hole (320) and the inner connecting hole (322) are connected so that air enters the rubber ring (325) through the outer exhaust hole (320), the inner connecting hole (322), the annular cavity (323), and the outer connecting hole (324). The conical structure of the stop convex edge (319) abuts against the conical structure of the inner convex ring (311), the upper end face of the movable disk (309) abuts against the lower wall of the upper ring (308), and the inner circumference of the convex ring abuts against the conical wall of the upper ring (308). The first channel (317) is connected to its corresponding upper through hole (316). When no air enters the first air tube (305), the lower end of the movable plate (309) contacts the upper end face of the lower ring (310), and the first channel (317) is connected to its corresponding lower through hole (318).

5. The PTFE material printed circuit board hole deburring device according to claim 1, characterized in that, A lower cover plate (400) is fixed to the lower end of the lower ring (331). A lower extension tube (401) is formed on the lower wall of the lower cover plate (400). Multiple umbrella-shaped rings (402) are formed on the outer periphery of the lower extension tube (401). The diameter of the lower end of the umbrella-shaped ring (402) is larger than the diameter of its upper end, and the outer diameter of the umbrella-shaped rings (402) increases sequentially from bottom to top. An inner cavity (404) is formed inside the lower extension tube (401). The lower end of the inner cavity (404) is formed by... The end is connected to an air outlet (405), and the two ends of the air outlet (405) are respectively formed with conical holes. The diameter of the lower end of the conical hole located at the upper end is smaller than the diameter of the upper end, and the diameter of the lower end of the conical hole located at the lower end is larger than the diameter of the upper end. The upper end of the lower extension tube (401) is connected to a duct (403). One end of the duct (403) is connected to the inner cavity (404), and the other end of the duct (403) is connected to the lower through hole (318).

6. A method for removing burrs inside holes of a PTFE printed circuit board, characterized in that, The PTFE material printed circuit board hole deburring device as described in any one of claims 1 to 5 includes the following steps: Step 01: Place the printed circuit board made of PTFE material to be processed on the positioning fixture for removing burrs inside the holes of the PTFE printed circuit board, and position the printed circuit board (6) using the positioning fixture for removing burrs inside the holes of the PTFE printed circuit board. Step 02: Import the design drawings of the printed circuit board to be processed into a computer with an automatic control system. The design drawings contain the geometric coordinate information of the holes on the printed circuit board, the diameter of the holes, and the depth of the holes. Step 03: Start the automatic control system and control the two-dimensional linear XY translation stage to drive the lifting mechanism (1) to move so that the first removal part (3) is located directly above the positioning hole of the printed circuit board (6); Step 04: The automatic control system controls the first removal component (3) to move along a predetermined trajectory to each hole of the printed circuit board (6) according to the geometric coordinate information of the holes on the printed circuit board (6); Step 05: The automatic control system controls the lifting mechanism (1) to move downward according to the diameter and depth of the hole; If the diameter of the hole is greater than 2mm, the lifting mechanism (1) drives the second removal part (4) through the corresponding hole, and makes the scraper (340) and the rubber ring (325) located below the corresponding hole; The automatic control system controls the air intake pump to move the scraper (340) out, and the first channel (317) connects with its corresponding upper through hole (316); The automatic control system controls the dry ice to be sprayed outward through the upper through hole (316) onto the inner wall of the hole, and the dry ice is in contact with the inner wall of the hole for more than 2 seconds. The automatic control system controls the lifting mechanism (1) to move the rubber ring (325) upward so that the rubber ring (325) removes the burrs from the hole; During the process of the automatic control system controlling the lifting mechanism (1) to move the rubber ring (325) upward, the rotating motor (20) drives the rotating shaft (21) and the scraper (340) to rotate, so that the scraper (340) removes the burrs in the hole again; If the diameter of the hole is less than 2mm, the lifting mechanism (1) drives the lower extension tube (401) of the second removal part (4) to pass into the corresponding hole; The automatic control system controls the dry ice to be sprayed out through the air outlet (405) and fill the corresponding hole, and stops the flow of dry ice after the dry ice has been flowing in for 2 seconds. The automatic control system controls the lifting mechanism (1) to drive the lower extension tube (401) to reciprocate up and down. During the movement, the outer edge of the umbrella ring (402) acts on the inner wall of the hole to remove burrs. Step 06: Complete the removal of all burrs on the inner wall of the hole by the automatic control system. After removal, cancel the positioning of the printed circuit board (6) and take out the printed circuit board (6).

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