A kind of milling device of special depth control drill bit for PCB board

Abstract

The application provides a milling device for a special depth control drill bit of a PCB, and belongs to the technical field of drill bit processing. The milling device solves the technical problems of low processing efficiency, easy damage of the milling cutter and poor processing quality. The milling device for the special depth control drill bit of the PCB comprises a machine table, three sides of an installation column are provided with rotating mechanisms, a first electric telescopic rod is arranged on the rotating mechanism, an installation box is fixed to the telescopic end of the first electric telescopic rod, second electric telescopic rods are fixed to the upper and lower surfaces of the installation box, a rotating motor is fixed to the telescopic end of the second electric telescopic rod, a connecting seat is fixed to the output shaft end of the rotating motor, a milling cutter is detachably connected to the connecting seat, a ring-shaped sliding rail is fixed to the upper side of the machine table, four sliding seats are slidably connected to the ring-shaped sliding rail, and adjacent two sliding seats are connected through a connecting rod. The application has the advantages of being suitable for special milling of the depth control drill bit, being capable of guaranteeing the processing quality, and being capable of improving the production efficiency.

Description

Technical Field

[0001] This invention belongs to the field of drill bit processing technology, and relates to a milling device, particularly a milling device for a depth-controlled drill bit for PCB boards. Background Technology

[0002] Back-drilling is increasingly used in PCBs. PCB factories have insufficient back-drilling processing capabilities in the following three aspects: (1) The alignment deviation between back-drilled holes and through holes is controlled within ±50μm. Often, the alignment deviation of individual holes exceeds 50μm, resulting in copper residue on the hole wall after back-drilling; (2) The stub length is controlled within ≥50μm. Due to the back-drilling nozzle angle, the stub shape is not neat and there are height differences. The length control of the back-drilling stub is not accurate; (3) When back-drilling micro-holes, a large amount of drilling slag is generated. The drilling slag blocks the through hole section near the back-drilling section. For this reason, our company has designed a new type of depth control drill bit for back-drilling.

[0003] However, during the processing of the new depth control drill bit for back drills, it was found that the existing milling equipment for drill bit production is not only unsuitable for the processing of the new depth control drill bit, but also often processes one drill bit at a time before processing another. This causes the drill bit to be subjected to milling friction for a long time, resulting in high drill bit temperatures, which affects the processing quality to some extent. At the same time, the milling cutter used to process the drill bit is also prone to damage due to prolonged operation, which not only affects the processing efficiency but also the processing quality. Summary of the Invention

[0004] The purpose of this invention is to address the aforementioned problems in existing technologies by proposing a milling device for a PCB board-specific depth-controlled drill bit. The technical problem this invention aims to solve is: how to design a dedicated milling machine suitable for depth-controlled drill bits that can both ensure processing quality and improve production efficiency.

[0005] The objective of this invention can be achieved through the following technical solutions:

[0006] A milling device for a PCB board-specific depth-controlled drill bit includes a machine base. A mounting column is fixed to the middle of the upper side of the machine base. A rotating mechanism is provided on three sides of the mounting column. A first electric telescopic rod is provided on the rotating mechanism. A mounting box is fixed to the telescopic end of the first electric telescopic rod. A second electric telescopic rod is fixed to the upper and lower sides of the mounting box. A rotary motor is fixed to the telescopic end of the second electric telescopic rod. A connecting seat is fixed to the output shaft end of the rotary motor. A milling cutter is detachably connected to the connecting seat. A ring slide rail is fixed to the upper side of the machine base. Four slide blocks are slidably connected to the ring slide rail. Adjacent slide blocks are connected by connecting rods. A drive mechanism is provided on the mounting column. The drive mechanism is connected to the slide blocks and the rotating mechanism. A switching motor is fixed to the upper side of the slide blocks. A rotating disk is fixed to the output shaft end of the switching motor. A plurality of clamping seats are distributed in a ring on the rotating disk.

[0007] The working principle of this invention is as follows: During operation, four workstations are formed on four rotating disks, namely a loading / unloading workstation, a primary milling workstation, a secondary milling workstation, and a tertiary milling workstation. Three milling cutters correspond to the primary, secondary, and tertiary milling workstations, respectively, and the specifications and models of the three milling cutters are different depending on the workstation. At the loading / unloading workstation, the material of the depth control drill bit is clamped and fixed on the clamping seat. Then, the drive mechanism drives the slide to move along the annular slide rail, so that the clamped material is moved to the primary milling workstation. The milling cutter at the primary milling workstation is used to process the standard cylindrical section of the depth control drill bit. When all the material on the rotating disk has been processed to the standard cylindrical section, the drive mechanism drives the rotating disk to the secondary milling workstation. The milling cutter at the secondary milling workstation is used to process the drill tip section of the depth control drill bit. At the same time, the drive mechanism drives the rotating mechanism to rotate, so that the positions of the two milling cutters at the primary milling workstation are exchanged, so that the other milling cutter is used to process the material on the primary milling workstation to the standard cylindrical section. In the machining of the cylindrical section, after the secondary milling station is completed, the raw material with the drill tip section is moved to the tertiary milling station. The cutter at the tertiary milling station is used to machine the cutter body section. At the same time, the cutters at the primary and secondary milling stations exchange positions. After the cutter body section is machined, the machined depth control drill bit is moved to the loading and unloading station for loading and unloading. Simultaneously, the raw material from the previous station is moved to the next station. This structure not only enables multi-stage machining of the depth control drill bit, ensuring machining continuity, but also allows for the rotation of two cutters at each milling station. This provides sufficient time for the cutters to cool down or be replaced, ensuring operational stability and extending their service life. Machining efficiency is guaranteed. Furthermore, after each stage of machining of the depth control drill bit, the raw material has a certain cooling time, preventing excessively high temperatures caused by continuous machining and affecting machining quality. Thus, while ensuring machining efficiency, the machining quality of the depth control drill bit is improved.

[0008] The driving mechanism includes an annular seat, which is fixedly connected to a slide. A gear ring is fixed on the annular seat, and a drive motor is fixed on a mounting column. A drive gear is fixed to the output shaft end of the drive motor, and the drive gear meshes with the gear ring.

[0009] With the above structure, during operation, the rotation of the drive motor causes the drive gear to drive the ring seat to rotate through the gear ring, which in turn causes the ring seat to move the slide, thus enabling the raw materials to move between multiple workstations. The structure is simple and has a high degree of automation.

[0010] The rotating mechanism includes a rotating column, which is rotatably connected to a mounting column. A first electric telescopic rod is fixedly connected to the rotating column. A driven sprocket is fixed on the rotating column. Several drive columns are rotatably connected to the mounting column. A drive sprocket is fixed on the drive column. The driven sprocket and the drive sprocket are connected by a chain. A driven gear is fixed on the drive column. The driven gear meshes with a gear ring.

[0011] Using the above mechanism, when the drive electric rotating disk moves across multiple workstations, the gear ring can drive the drive sprocket to rotate, which in turn drives the driven sprocket to rotate the rotating column. The rotating column, through the first electric telescopic rod, drives the two milling cutters on the mounting box to rotate, so that for every 90° movement of the raw material, the two milling cutters can rotate 180° to switch positions. This ensures high operational stability, guarantees the coordinated performance of the device, prevents mutual interference in case of malfunctions, ensures processing accuracy, and reduces the failure rate.

[0012] The clamping seat has a clamping hole, and sliding columns are symmetrically connected to the clamping seat. A clamping plate is fixed to one end of the sliding column in the clamping hole, and a connecting plate is fixed to the other end of the sliding column. A threaded rod is fixed to the other end of the connecting plate. A rotating handle is provided between the two threaded rods. Threaded cavities are provided at both ends of the rotating handle, and the threaded rod is threadedly connected to the threaded cavity.

[0013] Using the above mechanism, when clamping and fixing the raw material of the depth control drill bit, the raw material can be placed in the clamping hole. Then, by rotating the handle, the two threaded rods move into the threaded cavity, thereby driving the sliding column to move towards each other through the connecting plate. This causes the two clamping plates to move closer together to clamp and fix the raw material. Using the above mechanism, it can be ensured that the two clamping plates move the same distance, thus ensuring the concentricity of the raw material. At the same time, it simplifies the clamping steps, reduces the difficulty of operation, improves work efficiency, and ensures the quality of processing.

[0014] The mounting box contains a lubricant tank, and ventilation boxes are fixed at both the top and bottom of the lubricant tank. A communication mechanism is provided between the ventilation boxes and the lubricant tank. A sponge pad is placed inside the ventilation box. A first fan is fixed at both the top and bottom of the mounting box. The first fan is connected to the ventilation box through an exhaust pipe. An air inlet pipe is connected to the ventilation box. The air outlet of the first fan is connected to an annular air supply seat through an air supply pipe. The drive shaft and the milling cutter are both hollow structures and are interconnected. The annular air supply seat is rotatably connected to the drive shaft and is connected to the interior of the drive shaft. An air outlet is provided on the milling cutter.

[0015] By employing the above mechanism, air can be introduced into the milling cutter using the first fan. This not only removes some of the heat from the milling cutter, thus achieving heat dissipation, but also blows away milling debris through the air outlet, thereby improving the quality of milling. Simultaneously, the connecting mechanism delivers lubricant from the lubricant tank into the sponge pad, so that the air exiting the ventilation box carries some lubricant, improving the lubrication effect between the milling cutter and the workpiece. This ensures the quality of milling while protecting the milling cutter. The structure is highly compact and practical.

[0016] The air outlet is provided in two rows. One row of air outlets is perpendicular to the milling cutter, and the other row of air outlets is inclined downwards.

[0017] By adopting the above structure, the air blowing range can be increased, and different milling conditions can be met, thereby ensuring the blowing effect on debris.

[0018] The connecting mechanism includes a connecting pipe, through which the ventilation box and the lubricating fluid tank are connected. An absorbent cotton strip is installed inside the connecting pipe, with both ends of the absorbent cotton strip extending out of the connecting pipe and located inside the ventilation box and the lubricating fluid tank, respectively.

[0019] Using the above structure, the lubricant in the lubricant tank can be slowly absorbed into the sponge pad of the ventilation chamber by the absorbent cotton strip. This ensures that there is a certain amount of lubricant in the sponge pad while preventing excessive leakage per unit time, thus avoiding waste of lubricant. Under the action of gravity, the lubricant is only delivered to the ventilation box below, preventing the upper ventilation box from receiving lubricant even when it is not in operation, ensuring operational stability. Moreover, the structure is simple, requires no control, and achieves excellent results with a simple structure, making it highly practical.

[0020] Both ends of the rotary handle are fixed with mounting plates, and a cleaning steel needle is fixed on the lower side of the mounting plate. The lower end of the cleaning steel needle matches the thread groove of the threaded rod.

[0021] With the above structure, when rotating the rotary handle, the cleaning steel needle can be used to clean the thread groove that is about to enter the thread cavity, preventing dust, oil, debris and other impurities from entering the thread cavity. This protects the thread rod and prevents impurities from hindering its rotation, ensuring normal operation.

[0022] A second fan is installed on the mounting plate. The cleaning steel needle is a hollow structure. The air outlet of the second fan is connected to the interior of the cleaning steel needle. Several downward-sloping chip blowing ports are opened at the lower end of the cleaning steel needle.

[0023] With the above structure, when cleaning the thread groove of the steel rod, the second fan can be turned on, and the debris can be blown away by the chip blowing port, thereby further improving the cleaning effect on the thread rod and making it highly practical.

[0024] Compared with existing technologies, the milling device with a dedicated depth control drill bit for PCB boards has the following advantages:

[0025] 1. During operation, four rotating disks form four workstations: a loading / unloading station, a primary milling station, a secondary milling station, and a tertiary milling station. Three milling cutters correspond to the primary, secondary, and tertiary milling stations respectively, and their specifications differ depending on the workstation. At the loading / unloading station, the material for the depth control drill bit is clamped and fixed on the clamping seat. Then, the drive mechanism moves the slide along the annular slide rail, moving the clamped material to the primary milling station. The milling cutter at the primary milling station processes the standard cylindrical section of the depth control drill bit. Once all the material on the rotating disk has been processed to the standard cylindrical section, the drive mechanism moves the rotating disk to the secondary milling station. The milling cutter at the secondary milling station processes the drill tip section of the depth control drill bit. Simultaneously, the drive mechanism rotates the rotating mechanism, causing the positions of the two milling cutters at the primary milling station to exchange, allowing the other milling cutter to process the standard cylindrical section of the material on the primary milling station. After the machining at the secondary milling station is completed, the raw material with the drill tip section machined is moved to the tertiary milling station. The cutter body section is machined using the milling cutter at the tertiary milling station. At the same time, the milling cutters at the primary and secondary milling stations exchange positions. After the cutter body section is machined, the machined depth control drill bit is moved to the loading and unloading station for loading and unloading. Simultaneously, the raw material from the previous station is moved to the next station. This structure not only enables multi-stage machining of the depth control drill bit, ensuring machining continuity, but also allows for the rotation of two milling cutters at each milling station. This provides sufficient time for the milling cutters to cool down or be replaced, ensuring operational stability and extending their service life. Machining efficiency is guaranteed. Furthermore, the raw material has a certain cooling time after each stage of machining of the depth control drill bit, preventing excessively high temperatures caused by continuous machining and affecting machining quality. Thus, while ensuring machining efficiency, the machining quality of the depth control drill bit is improved.

[0026] 2. When the drive electric rotating disk moves between multiple workstations, the gear ring can drive the drive sprocket to rotate, which in turn drives the driven sprocket to rotate the rotating column. The rotating column drives the two milling cutters on the mounting box to rotate through the first electric telescopic rod. This allows the two milling cutters to rotate 180° for every 90° movement of the raw material, enabling position switching. This ensures high operational stability, guarantees the coordinated performance of the device, prevents mutual interference in case of malfunctions, ensures processing accuracy, and reduces the failure rate.

[0027] 3. When clamping and fixing the raw material of the depth control drill bit, the raw material can be placed in the clamping hole. Then, by rotating the handle, the two threaded rods move into the threaded cavity, thereby driving the sliding column to move in opposite directions through the connecting plate. This causes the two clamping plates to move closer together to clamp and fix the raw material. Using the above mechanism, it can be ensured that the two clamping plates move the same distance, thus ensuring the concentricity of the raw material. At the same time, it simplifies the clamping steps, reduces the difficulty of operation, improves work efficiency, and ensures the quality of processing.

[0028] 4. Air can be introduced into the milling cutter using the first fan. This can remove some of the heat from the milling cutter, thus achieving heat dissipation. On the other hand, the air outlet can blow away the milling debris in a timely manner, thereby improving the milling quality. At the same time, the connecting mechanism delivers lubricant from the lubricant tank into the sponge pad, so that the air exiting the ventilation box carries some lubricant, improving the lubrication effect between the milling cutter and the material. This ensures the quality of milling while protecting the milling cutter. The structure is compact and highly practical.

[0029] 5. When rotating the handle, a cleaning needle can be used to clean the thread grooves that are about to enter the thread cavity, preventing dust, oil, debris and other impurities from entering the thread cavity. This protects the thread rod and prevents impurities from hindering its rotation, ensuring normal operation. While cleaning the thread grooves with the cleaning needle, a second blower can be turned on to blow away the debris through the blower nozzle, further improving the cleaning effect on the thread rod. This method is highly practical. Attached Figure Description

[0030] Figure 1 This is a three-dimensional structural diagram of the present invention.

[0031] Figure 2 This is a three-dimensional structural schematic diagram from another perspective of the present invention.

[0032] Figure 3 This is a schematic diagram of the clamping seat in this invention.

[0033] Figure 4 This is a schematic diagram of the installation structure of the rotating disk in this invention.

[0034] Figure 5 This is a schematic diagram of the installation structure of the milling cutter in this invention.

[0035] Figure 6 This is a schematic diagram of the milling cutter mounting structure from another perspective in this invention.

[0036] Figure 7 yes Figure 6 A magnified view of a portion of point A in the middle.

[0037] Figure 8 This is a schematic diagram of the machine tool in this invention.

[0038] Figure 9 This is a schematic diagram of the mounting box in this invention.

[0039] Figure 10 This is a schematic diagram of the rotating handle in this invention.

[0040] Figure 11 yes Figure 10 A magnified view of a section at point B in the middle.

[0041] Figure 12 This is a schematic diagram of the structure of the novel depth control drill bit for back drilling in this invention.

[0042] In the diagram: 1. Machine base; 2. Mounting column; 3. Circular slide rail; 4. Slide seat; 5. Rotary disk; 6. Rotating column; 7. Driven sprocket; 8. First electric telescopic rod; 9. Mounting box; 10. Clamping seat; 11. Clamping hole; 12. Clamping plate; 13. Slide column; 14. Connecting plate; 15. Threaded rod; 16. Rotary handle; 17. Switching motor; 18. Second electric telescopic rod; 19. Rotary motor; 20. Drive shaft; 21. Connecting seat; 22. Milling cutter; 23. 24. Annular air supply seat; 25. Air supply duct; 26. First fan; 27. Air outlet; 28. Annular seat; 29. ​​Gear ring; 30. Drive motor; 31. Drive gear; 32. Drive column; 33. Drive sprocket; 34. Driven gear; 35. Lubricating fluid tank; 36. Ventilation box; 37. Connecting pipe; 38. Absorbent cotton strip; 39. Sponge pad; 40. Air inlet duct; 41. Exhaust duct; 42. Mounting plate; 43. Second fan; 44. Cleaning steel needle; 45. Chip blower. Detailed Implementation

[0043] The following are specific embodiments of the present invention, which are described in conjunction with the accompanying drawings. However, the present invention is not limited to these embodiments.

[0044] like Figures 1-11As shown, the milling device for the PCB board-specific depth control drill bit includes a machine base 1. A mounting column 2 is fixed to the middle of the upper side of the machine base 1. A rotating mechanism is provided on three sides of the mounting column 2. A first electric telescopic rod 8 is provided on the rotating mechanism. A mounting box 9 is fixed to the telescopic end of the first electric telescopic rod 8. A second electric telescopic rod 18 is fixed to both the upper and lower sides of the mounting box 9. A rotary motor 19 is fixed to the telescopic end of the second electric telescopic rod 18. A connecting seat 21 is fixed to the output shaft end of the rotary motor 19. A milling cutter 22 is detachably connected to the connecting seat 21. An annular slide rail 3 is fixed to the upper side of the machine base 1. Four slide blocks 4 are slidably connected to the annular slide rail 3. Two adjacent slide blocks 4 are connected by a connecting rod. A driving mechanism is provided on the mounting column 2. The driving mechanism is connected to the slide blocks 4 and the rotating mechanism. A switching motor 17 is fixed to the upper side of the slide blocks 4. A rotating disk 5 is fixed to the output shaft end of the switching motor 17. Several clamping seats 10 are distributed in a ring on the rotating disk 5.

[0045] During operation, four rotating disks 5 form four workstations: a loading / unloading station, a primary milling station, a secondary milling station, and a tertiary milling station. Three milling cutters 22 correspond to the primary, secondary, and tertiary milling stations respectively, and the specifications of the three milling cutters 22 differ depending on the workstation. At the loading / unloading station, the material for the depth control drill bit is clamped and fixed on the clamping seat 10. Then, the drive mechanism moves the slide 4 along the annular slide rail 3, causing the clamped material to move to the primary milling station. In the first-stage milling station, the milling cutter 22 is used to machine the standard cylindrical section of the depth control drill bit. Once all the material on the rotary table 5 has been machined to the standard cylindrical section, the drive mechanism moves the rotary table 5 to the second-stage milling station. In the second-stage milling station, the milling cutter 22 is used to machine the drill tip section of the depth control drill bit. Simultaneously, the drive mechanism rotates the rotary mechanism, causing the positions of the two milling cutters 22 in the first-stage milling station to exchange. This allows the other milling cutter 22 to machine the standard cylindrical section of the material on the first-stage milling station. In the machining of the cylindrical section, after the secondary milling station is completed, the raw material with the drill tip section is moved to the tertiary milling station. The cutter 22 at the tertiary milling station is used to machine the cutter body section. At the same time, the cutters 22 at the primary and secondary milling stations exchange positions. After the cutter body section is machined, the machined depth control drill bit is moved to the loading and unloading station for loading and unloading. Simultaneously, the raw material from the previous station is moved to the next station. This structure not only enables multi-stage machining of the depth control drill bit, ensuring machining continuity, but also allows for the rotation of two cutters 22 at each milling station. This provides sufficient time for the cutters 22 to cool down or be replaced, ensuring operational stability and extending their service life. Machining efficiency is guaranteed. Furthermore, after each stage of machining of the depth control drill bit, the raw material has a certain cooling time, preventing excessively high temperatures caused by continuous machining and affecting machining quality. Thus, while ensuring machining efficiency, the machining quality of the depth control drill bit is improved.

[0046] The driving mechanism includes an annular seat 27, which is fixedly connected to the slide 4. A gear ring 28 is fixed on the annular seat 27, and a drive motor 29 is fixed on the mounting column 2. A drive gear 30 is fixed to the output shaft end of the drive motor 29, and the drive gear 30 meshes with the gear ring 28.

[0047] With the above structure, during operation, the rotation of the drive motor 29 causes the drive gear 30 to drive the ring seat 27 to rotate through the gear ring 28, which in turn causes the ring seat 27 to move the slide 4, thus enabling the raw materials to move between multiple workstations. The structure is simple and has a high degree of automation.

[0048] The rotating mechanism includes a rotating column 6, which is rotatably connected to a mounting column 2. A first electric telescopic rod 8 is fixedly connected to the rotating column 6. A driven sprocket 7 is fixed on the rotating column 6. Several drive columns 31 are rotatably connected to the mounting column 2. A drive sprocket 32 ​​is fixed on the drive column 31. The driven sprocket 7 and the drive sprocket 32 ​​are connected by a chain. A driven gear 33 is fixed on the drive column 31. The driven gear 33 meshes with a gear ring 28.

[0049] Using the above mechanism, when the drive electric rotating disk 5 moves across multiple workstations, the gear ring 28 can drive the drive sprocket 32 ​​to rotate, thereby causing the driven sprocket 7 to drive the rotating column 6 to rotate. The rotating column 6 drives the two milling cutters 22 on the mounting box 9 to rotate via the first electric telescopic rod 8, so that for every 90° movement of the raw material, the two milling cutters 22 can rotate 180° to switch positions. This ensures high working stability, guarantees the coordinated performance of the device, prevents mutual interference in case of malfunctions, ensures the accuracy of processing, and reduces the failure rate.

[0050] The clamping seat 10 has a clamping hole 11. A sliding column 13 is symmetrically slidably connected to the clamping seat 10. A clamping plate 12 is fixed to one end of the sliding column 13 inside the clamping hole 11. A connecting plate 14 is fixed to the other end of the sliding column 13. A threaded rod 15 is fixed to the other end of the connecting plate 14. A rotating handle 16 is provided between the two threaded rods 15. Threaded cavities are provided at both ends of the rotating handle 16. The threaded rod 15 is threadedly connected to the threaded cavity.

[0051] Using the above mechanism, when clamping and fixing the raw material of the depth control drill bit, the raw material can be placed in the clamping hole 11. Then, by rotating the handle 16, the two threaded rods 15 move into the threaded cavity, thereby driving the sliding column 13 to move towards each other through the connecting plate 14. This causes the two clamping plates 12 to move closer to each other and clamp and fix the raw material. Using the above mechanism, it can be ensured that the two clamping plates 12 move the same distance, thereby ensuring the concentricity of the raw material. At the same time, it simplifies the clamping steps, reduces the difficulty of operation, improves work efficiency, and ensures the quality of processing.

[0052] The mounting box 9 is equipped with a lubricant tank 34. Ventilation boxes 35 are fixed at both the upper and lower ends of the lubricant tank 34. A communication mechanism is provided between the ventilation boxes 35 and the lubricant tank 34. A sponge pad 38 is provided inside the ventilation box 35. A first fan 25 is fixed at both the upper and lower ends of the mounting box 9. The first fan 25 is connected to the ventilation box 35 through an exhaust pipe 40. An air inlet pipe 39 is connected to the ventilation box 35. The air outlet of the first fan 25 is connected to an annular air supply seat 23 through an air supply pipe 24. The drive shaft 20 and the milling cutter 22 are both hollow structures and are interconnected. The annular air supply seat 23 is rotatably connected to the drive shaft 20 and is connected to the interior of the drive shaft 20. An air outlet 26 is provided on the milling cutter 22.

[0053] By employing the above mechanism, air can be introduced into the milling cutter 22 using the first fan 25. On the one hand, this can remove some of the heat from the milling cutter 22, thus achieving heat dissipation. On the other hand, the milling debris generated can be blown away in a timely manner through the air outlet 26, thereby improving the milling quality. At the same time, the lubricating fluid in the lubricating fluid tank 34 is sent into the sponge pad 38 through the connecting mechanism, so that the air exiting the ventilation box 35 carries some lubricating fluid, improving the lubrication effect between the milling cutter 22 and the material, ensuring the milling quality while protecting the milling cutter 22. The structure is highly compact and practical.

[0054] The air outlet 26 is provided in two rows. One row of air outlets 26 is perpendicular to the milling cutter 22, and the other row of air outlets 26 is inclined downward.

[0055] By adopting the above structure, the air blowing range can be increased, and different milling conditions can be met, thereby ensuring the blowing effect on debris.

[0056] The connecting mechanism includes a connecting pipe 36, through which the ventilation box 35 and the lubricating fluid tank 34 are connected. An absorbent cotton strip 37 is provided inside the connecting pipe 36, with both ends of the absorbent cotton strip 37 extending out of the connecting pipe 36 and located inside the ventilation box 35 and the lubricating fluid tank 34, respectively.

[0057] With the above structure, the lubricant in the lubricant tank 34 can be slowly absorbed into the sponge pad 38 of the ventilation chamber by the absorbent cotton strip 37. This ensures that there is a certain amount of lubricant in the sponge pad 38, while also preventing excessive discharge per unit time, thus avoiding waste of lubricant. Under the action of gravity, the lubricant is only delivered to the ventilation box 35 below, preventing the ventilation box 35 above from being delivered even when it is not in operation, ensuring operational stability. Moreover, the structure is simple, requires no control, and achieves excellent results with a simple structure, making it highly practical.

[0058] Both ends of the rotating handle 16 are fixed with mounting plates 41, and a cleaning steel needle 43 is fixed on the lower side of the mounting plate 41. The lower end of the cleaning steel needle 43 matches the thread groove of the threaded rod 15.

[0059] With the above structure, when the rotating handle 16 is rotated, the cleaning steel needle 43 can be used to clean the thread groove that is about to enter the thread cavity, preventing dust, oil and debris from entering the thread cavity. This protects the thread rod 15 and prevents debris from hindering the rotation of the thread rod 15, ensuring normal operation.

[0060] The mounting plate 41 is equipped with a second fan 42, the cleaning steel needle 43 is a hollow structure, the air outlet of the second fan 42 is connected to the interior of the cleaning steel needle 43, and the lower end of the cleaning steel needle 43 is provided with several downward inclined chip blowing ports 44.

[0061] With the above structure, when cleaning the thread groove with the cleaning needle 43, the second fan 42 can be turned on, and the debris can be blown away by the chip blowing port 44, thereby further improving the cleaning effect on the threaded rod 15 and making it highly practical.

[0062] This invention relates to a novel depth control drill bit specifically for back drilling, such as... Figure 12 As shown, the overall design is divided into four sections. The first section is a circular shank; the second section is a blade section with chip removal grooves in its cross-section; the third section is designed as a standard cylinder. The end of the second section closest to the third section has a flat cutting edge with a 180° angle. This ensures that the stub will not have height differences after back-drilling, and the stub's cross-sectional shape is neat, improving the control precision of the stub length and achieving the optimal standard of a stub length of 0. d1 is the diameter of the third section's cylinder. The third section does not have cutting or chip removal functions; its diameter d1 is smaller than the diameter D of the second section, and the diameter of the third section is 40-70 μm smaller than the diameter of the second section. The main function of the third section is... The function of back-drilling hole and first-hole offset correction is to ensure that each back-drilling hole is aligned with the first-hole, with an offset of <10μm. During back-drilling, the cylinder of the third section almost fills the through-hole section, which can completely eliminate the problem of drill cuttings clogging the hole, thus improving the effect of drill cuttings clogging the hole. D is the diameter of the back-drilling bit. The fourth section is the drill tip angle section with a cutting edge. The drill tip has an angle and has a cutting function. The drill tip angle is 90°-160°. When drilling down, when the drill tip angle contacts the back-drilling cover plate, the drill tip plays a role in anti-slip positioning. During the entire back-drilling process, the drill tip of the fourth section only works on the cover plate. After drilling through the cover plate, the fourth section enters the through hole and will not have any effect on the through hole.

[0063] The milling device using the PCB board-specific depth control drill bit of the present invention is fully applicable to the special processing and production of the new type of depth control drill bit for back drilling, which can ensure both the processing quality and the processing efficiency of the depth control drill bit.

[0064] The working principle of this invention is as follows: During operation, four rotating disks 5 form four workstations: a loading / unloading workstation, a primary milling workstation, a secondary milling workstation, and a tertiary milling workstation. Three milling cutters 22 correspond to the primary, secondary, and tertiary milling workstations, respectively. The specifications and models of the three milling cutters 22 differ depending on the workstation. At the loading / unloading workstation, the material for the depth control drill bit is clamped and fixed on the clamping seat 10. When clamping and fixing the material for the depth control drill bit, the material can be placed in the clamping hole 11. Then, by rotating the handle 16, the two threaded rods 15 move into the threaded cavity, thereby driving the sliding column 13 to move towards each other through the connecting plate 14. This causes the two clamping plates 12 to move closer together to clamp and fix the material. Then, the rotation of the drive motor 29 causes the drive gear 30 to drive the ring seat 27 to rotate via the gear ring 28, which in turn causes the ring seat 27 to move the slide 4, moving the clamped material to the first-stage milling station. The milling cutter 22 at the first-stage milling station is used to machine the standard cylindrical section of the depth control drill bit. Simultaneously, the first fan 25 introduces air into the milling cutter 22, which removes some of the heat, thus cooling the cutter 22. Furthermore, the air outlet 26 blows away milling debris, improving milling quality. At the same time, the connecting mechanism delivers lubricant from the lubricant tank 34 into the sponge pad 38, so that the air exiting the ventilation box 35 carries some lubricant, improving the contact between the milling cutter 22 and the lubricant. The lubrication between the raw materials ensures the quality of milling while protecting the milling cutter 22. After the standard cylindrical section of the raw material on the rotary table 5 has been processed, the drive mechanism moves the rotary table 5 to the secondary milling station. The milling cutter 22 at the secondary milling station processes the drill tip section of the depth control drill bit. Simultaneously, when the drive motor moves the rotary table 5 to multiple stations, the gear ring 28 can drive the drive sprocket 32 ​​to rotate, thereby causing the driven sprocket 7 to drive the rotating column 6 to rotate. The rotating column 6 drives the two milling cutters 22 on the mounting box 9 to rotate through the first electric telescopic rod 8. This allows the two milling cutters 22 to rotate 180° for every 90° movement of the raw material, switching positions and exchanging the positions of the two milling cutters 22 at the primary milling station. Another end mill 22 is used to machine the standard cylindrical section of the material at the first-level milling station. After machining at the second-level milling station, the material with the drill tip section machined is moved to the third-level milling station, where the end mill 22 is used to machine the tool body section. Simultaneously, the end mills 22 at both the first and second-level milling stations exchange positions. After the tool body section is machined, the machined depth control drill bit is moved to the loading / unloading station for loading and unloading. At the same time, the material from the previous station is moved backward. This structure not only enables multi-level machining of the depth control drill bit, ensuring machining continuity, but also allows for sufficient time for cooling or maintenance / replacement of the end mills 22, as each milling station has two end mills 22 that can be used alternately.This ensures operational stability and extends the service life of the milling cutter 22, guaranteeing machining efficiency. Furthermore, after each stage of machining by the depth-controlled drill bit, the raw material has a certain cooling time, preventing excessively high temperatures from affecting machining quality during continuous processing. Therefore, while maintaining machining efficiency, the machining quality of the depth-controlled drill bit is improved.

[0065] In summary, by designing a moving base and multiple sets of milling cutters 22, a special milling machine suitable for depth-controlled drill bits can be designed, which can not only ensure the quality of machining but also improve production efficiency and wind power.

[0066] The specific embodiments described herein are merely illustrative of the spirit of the invention. Those skilled in the art to which this invention pertains may make various modifications or additions to the described specific embodiments or use similar methods to substitute them, without departing from the spirit of the invention or exceeding the scope defined by the appended claims.

Claims

1. A milling device for a PCB board-specific depth-controlled drill bit, comprising a machine base (1), characterized in that, A mounting column (2) is fixed to the middle of the upper side of the machine base (1). A rotating mechanism is provided on three sides of the mounting column (2). A first electric telescopic rod (8) is provided on the rotating mechanism. A mounting box (9) is fixed to the telescopic end of the first electric telescopic rod (8). A second electric telescopic rod (18) is fixed to both the upper and lower sides of the mounting box (9). A rotary motor (19) is fixed to the telescopic end of the second electric telescopic rod (18). A connecting seat (21) is fixed to the output shaft end of the rotary motor (19). A milling cutter (22) is detachably connected to the connecting seat (21). A ring slide rail (3) is fixed to the upper side of the machine base (1). Four slide blocks (4) are slidably connected to the ring slide rail (3). Two adjacent slide blocks (4) are connected by a connecting rod. A driving mechanism is provided on the mounting column (2). The driving mechanism is connected to the slide blocks (4) and the rotating mechanism. A switching motor (17) is fixed to the upper side of the slide blocks (4). The output shaft of the switching motor (17) A rotating disk (5) is fixed at one end, and several clamping seats (10) are arranged in a ring on the rotating disk (5). A lubricating fluid tank (34) is fixed inside the mounting box (9). Ventilation boxes (35) are fixed at both the upper and lower ends of the lubricating fluid tank (34). A communication mechanism is provided between the ventilation boxes (35) and the lubricating fluid tank (34). A sponge pad (38) is provided inside the ventilation box (35). A first fan (25) is fixed at both the upper and lower ends of the mounting box (9). 5) The ventilation box (35) is connected through the exhaust pipe (40). The ventilation box (35) is connected to the air inlet pipe (39). The air outlet of the first fan (25) is connected to the annular air supply seat (23) through the air supply pipe (24). The drive shaft (20) and the milling cutter (22) are both hollow structures and are connected to each other. The annular air supply seat (23) is rotatably connected to the drive shaft (20) and is connected to the interior of the drive shaft (20). The milling cutter (22) has an air outlet (26).

2. The milling device for a PCB board-specific depth-controlled drill bit according to claim 1, characterized in that, The driving mechanism includes an annular seat (27), which is fixedly connected to the slide (4). A gear ring (28) is fixed on the annular seat (27), and a drive motor (29) is fixed on the mounting column (2). A drive gear (30) is fixed at the output shaft end of the drive motor (29), and the drive gear (30) meshes with the gear ring (28).

3. The milling device for a PCB board-specific depth-controlled drill bit according to claim 2, characterized in that, The rotating mechanism includes a rotating column (6), which is rotatably connected to a mounting column (2). A first electric telescopic rod (8) is fixedly connected to the rotating column (6). A driven sprocket (7) is fixed on the rotating column (6). Several drive columns (31) are rotatably connected to the mounting column (2). A drive sprocket (32) is fixed on the drive column (31). The driven sprocket (7) and the drive sprocket (32) are connected by a chain. A driven gear (33) is fixed on the drive column (31). The driven gear (33) meshes with a gear ring (28).

4. The milling device for a PCB board-specific depth-controlled drill bit according to claim 1, characterized in that, The clamping seat (10) is provided with a clamping hole (11). A sliding column (13) is symmetrically slidably connected on the clamping seat (10). A clamping plate (12) is fixed at one end of the sliding column (13) located in the clamping hole (11). A connecting plate (14) is fixed at the other end of the sliding column (13). A threaded rod (15) is fixed at the other end of the connecting plate (14). A rotating handle (16) is provided between the two threaded rods (15). Threaded cavities are provided at both ends of the rotating handle (16). The threaded rod (15) is threadedly connected to the threaded cavity.

5. The milling device for a PCB board-specific depth-controlled drill bit according to claim 1, characterized in that, The air outlet (26) is provided in two rows. One row of air outlets (26) is perpendicular to the milling cutter (22), and the other row of air outlets (26) is inclined downward.

6. The milling device for a PCB board-specific depth-controlled drill bit according to claim 1, characterized in that, The connecting mechanism includes a connecting pipe (36), and the ventilation box (35) and the lubricating liquid tank (34) are connected through the connecting pipe (36). An absorbent cotton strip (37) is provided inside the connecting pipe (36), and the two ends of the absorbent cotton strip (37) extend out of the connecting pipe (36) and are located in the ventilation box (35) and the lubricating liquid tank (34) respectively.

7. A milling device for a PCB board-specific depth-controlled drill bit according to claim 4, characterized in that, Both ends of the rotating handle (16) are fixed with mounting plates (41), and a cleaning steel needle (43) is fixed on the lower side of the mounting plate (41). The lower end of the cleaning steel needle (43) matches the thread groove of the threaded rod (15).

8. A milling device for a PCB board-specific depth-controlled drill bit according to claim 7, characterized in that, The mounting plate (41) is equipped with a second fan (42), the cleaning steel needle (43) is a hollow structure, the air outlet of the second fan (42) is connected to the interior of the cleaning steel needle (43), and the lower end of the cleaning steel needle (43) is provided with several inclined downward blowing holes (44).

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