Improved circuit board micropore processing device

Abstract

The utility model relates to the technical field of circuit board machining, and provides an improved circuit board micropore machining device which comprises a numerical control tool changing drilling machine, a circuit board drilling workpiece and a drilling counting mechanism. The numerical control tool changing drilling machine comprises a rack, a three-coordinate moving assembly, a supporting seat, a drilling control assembly, a sliding seat, a main shaft, an automatic drilling tool clamp and a workpiece positioning assembly. The circuit board drilling workpiece comprises a circuit board, an aluminum foil and a base plate, and the upper surface of the aluminum foil is plated with an anti-skid film layer. The drilling counting mechanism comprises a position sensor, a counter and an MCU. The aluminum foil has the advantages that the anti-skid film layer is plated on the upper surface of the aluminum foil, so that a drilling tool is effectively prevented from slipping during drilling, the drilling quality can be improved, and the heat dissipation performance of the aluminum foil is reserved; the arranged drilling counting mechanism calculates the drilling frequency of the drilling tool, and when the preset frequency threshold value is reached, a tool changing signal is sent to the numerical control tool changing drilling machine, so that the drilling tool is replaced in time in the drilling process, and the probability that the drilling tool is broken is reduced.

Description

Technical Field

[0001] This utility model relates to the field of circuit board processing technology, and specifically to an improved device for processing micro-holes in circuit boards. Background Technology

[0002] Circuit boards, also known as printed circuit boards (PCBs), are important electronic components that serve as the support for electronic devices. Drilling is the primary step in PCB manufacturing, and there are strict requirements for the accuracy of hole positions and the smoothness of hole walls.

[0003] Copper clad laminate, also known as substrate, is a plate-like material made by impregnating reinforcing material with resin, covering one or both sides with copper foil, and then hot-pressing it. It is the basic material for making PCBs.

[0004] A drilling machine is used to drill the required holes in the circuit board. For the fabrication of micro-holes, such as those with a diameter of 0.25mm, a small-sized drill bit is required. Before actual drilling, aluminum foil is usually placed on the upper surface of the circuit board, which is then placed on the upper surface of a backing plate. The drill bit then drills multiple holes in the circuit board.

[0005] The purpose of aluminum foil is to prevent the drill bit from tearing the copper layer of the circuit board when drilling in and out; to help dissipate heat and remove chips during the drilling process, as aluminum has good heat dissipation properties; and to prevent burrs from forming on the surface of the circuit board during drilling.

[0006] The purpose of the backing plate is to help protect the circuit board, reduce drill bit wear, and improve drilling accuracy.

[0007] Because ordinary aluminum foil has high hardness and a smooth surface, it is prone to slippage when the drill bit enters the hole, causing varying degrees of hole displacement during drilling. As a result, the hole positions on the circuit board below the aluminum foil become more and more severely displaced layer by layer, which increases the probability of drill bit breakage. This is especially true for drill bits used for microholes, which have thinner blades and are more prone to breakage.

[0008] When drilling micro-holes in multilayer circuit boards, for example, if the circuit board thickness is 1.5mm, the aluminum foil thickness is 0.17mm, and the backing plate thickness is 1mm, the workpiece for drilling the circuit board includes, from top to bottom, one aluminum foil, three circuit boards, and one backing plate; the thickness of the workpiece for drilling the circuit board is 5.67mm. The drill bit for drilling 0.25mm diameter micro-holes has a blade length of 6.2mm. The drill bit maintains a rotation speed of approximately 15krpm. At this speed, compared to circuit boards with two or fewer layers, the heat generated when drilling micro-holes in a three-layer circuit board increases dramatically. If the drill bit operates for an extended period without timely cooling, its temperature will become too high, causing the drill bit to easily adhere to drill chips with poor thermal stability. This hinders the timely removal of drill chips during subsequent drilling, ultimately affecting the hole wall quality and, in severe cases, leading to drill bit breakage. To prevent the drill bit from overheating, it is necessary to replace it promptly.

[0009] Therefore, how to prevent the drill bit from slipping during drilling, replace the drill bit in a timely manner during the drilling process, and reduce the probability of drill bit breakage is a technical problem that urgently needs to be solved in this field. Utility Model Content

[0010] The technical problem to be solved by this utility model is to provide an improved device for micro-hole processing of circuit boards, which prevents the drill bit from slipping during drilling, allows for timely replacement of the drill bit during the drilling process, and reduces the probability of drill bit breakage.

[0011] This utility model is implemented as follows: an improved device for micro-hole processing of circuit boards, comprising:

[0012] CNC tool-changing drilling machine, circuit board drilling workpieces, and drilling counting mechanism;

[0013] The CNC tool-changing drilling machine includes a frame, a three-axis moving assembly, a support base, a drilling control assembly, a slide, a spindle, an automatic drill tool clamp, and a workpiece positioning assembly.

[0014] The support base is connected to the frame via the three-coordinate moving assembly. The slide is flexibly connected to the support base. The spindle is rotatably connected to the slide. The drilling control assembly can control the lifting state of the slide and the rotation state of the spindle. The automatic drill clamp is installed at the lower end of the spindle. The workpiece positioning assembly is installed on the frame and below the automatic drill clamp. The circuit board drilling workpiece is installed on the workpiece positioning assembly.

[0015] The circuit board drilling workpiece includes a circuit board, an aluminum foil, and a pad. The circuit board is placed on the upper surface of the pad, the aluminum foil is placed on the upper surface of the circuit board, and the upper surface of the aluminum foil is coated with an anti-slip film layer.

[0016] The borehole counting mechanism includes a position sensor, a counter, and an MCU. The position sensor is fixedly mounted on the support base and is used to detect the slide. The position sensor is electrically connected to the counter, the counter is electrically connected to the MCU, and the MCU is electrically connected to the borehole control component.

[0017] Furthermore, it also includes: a feeding cutter head and a discharging cutter head, both of which are fixedly mounted on the frame, and both of which have cutter grooves for placing drill bits.

[0018] Furthermore, the CNC tool changing drilling machine also includes a drill bit gripping component and a tool changing detection component. The drill bit gripping component is fixedly mounted on the slide and is adjacent to the automatic drill bit clamp. The tool changing detection component is fixedly mounted on the frame and is located between the loading cutter head and the unloading cutter head.

[0019] The tool change detection assembly includes a detection seat, a first transition tool slot, a second transition tool slot, and a drill bit detection sensor disposed on the detection seat.

[0020] Furthermore, the circuit board is a copper-clad laminate.

[0021] Furthermore, there are three or more copper-clad laminates between the pad and the aluminum foil.

[0022] Furthermore, the anti-slip film layer is composed of a mixture of polymer resin and lubricant.

[0023] Compared with the prior art, the advantages of this utility model are as follows: an anti-slip film layer is coated on the upper surface of the aluminum foil. The hardness of the anti-slip film layer is less than that of the aluminum foil, and the roughness of the anti-slip film layer is greater than that of the aluminum foil. This effectively prevents the drill bit from slipping during drilling, which helps to improve the drilling quality and also retains the heat dissipation performance of the aluminum foil. The drilling counting mechanism calculates the number of drilling operations of the drill bit. When the preset threshold number is reached, a tool change signal is sent to the CNC tool changer drilling machine. The CNC tool changer drilling machine replaces the drill bit, avoiding the use of a single drill bit for drilling for a long time. This prevents the drill bit from overheating and enables timely replacement of the drill bit during the drilling process, reducing the probability of drill bit breakage and increasing the service life of the drill bit. Attached Figure Description

[0024] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0025] Figure 1 This is a schematic diagram of the improved micro-hole processing device for circuit boards according to this utility model.

[0026] Figure 2 This is a schematic diagram of the structure of the circuit board drilling workpiece in the embodiment of this utility model.

[0027] Figure 3 This is a schematic diagram showing the connection between the automatic drill clamp and the spindle in an embodiment of this utility model.

[0028] Figure 4 This is a schematic diagram of the automatic drill bit clamp releasing the drill bit in an embodiment of this utility model.

[0029] Figure 5 This is a schematic diagram of the telescopic cylinder's telescopic rod disengaging downwards from the sliding sleeve in an embodiment of this utility model.

[0030] Figure 6 This is a schematic diagram of the drill bit structure in an embodiment of this utility model.

[0031] Figure 7 This is a schematic diagram of the drill bit gripping component in an embodiment of this utility model.

[0032] Figure 8This is a schematic diagram of the drill bit placed in the tool groove in an embodiment of this utility model.

[0033] Figure 9 This is a schematic diagram of the drill bit detection sensor detecting the drill bit in an embodiment of this utility model.

[0034] Figure 10 This is a schematic diagram showing the positions of the workpiece positioning component, the tool changing detection component, the loading cutter head, and the unloading cutter head in an embodiment of this utility model.

[0035] Figure 11 This is a schematic diagram of the MCU connection in an embodiment of this utility model.

[0036] Reference numerals: 1. CNC tool-changing drilling machine; 11. Frame; 12. Three-axis moving assembly; 13. Support base; 14. Drilling control assembly; 141. First servo motor; 142. Second servo motor; 143. Lead screw; 144. Bearing; 15. Slide; 16. Spindle; 17. Automatic drill bit clamp; 171. Housing; 172. Telescopic cylinder; 173. Tool holder; 1731. Mounting hole; 174. Limit ring; 175. Sliding sleeve; 176. Connecting rod; 177. Clamping block; 178. Limiting block; 18. Workpiece positioning assembly; 18. Positioning plate; 181. Clamping plate; 182. Drill bit gripper. Component 19; Pneumatic finger 191; Finger tip 1911; Gripping tool holder 192; Tool change detection component 110; Detection seat 111; First transition tool groove 112; Second transition tool groove 123; Drill bit detection sensor 124; Circuit board drilling workpiece 2; Circuit board 21; Aluminum foil 22; Anti-slip film layer 221; Pad 23; Drilling counting mechanism 3; Position sensor 31; Counter 32; MCU 33; Drill bit 4; Tool holder 41; Strip guide protrusion 411; Limiting plate 412; Loading tool disc 5; Unloading tool disc 6; Tool groove 61. Detailed Implementation

[0037] This utility model provides an improved device for micro-hole processing of circuit boards, overcoming the shortcomings of the prior art where the drill bit easily slips when drilling ordinary aluminum foil, causing serious hole displacement, and the drill bit operates for a long time without timely heat dissipation, resulting in high drill bit temperature, easy adhesion of drill chips, and easy breakage. It achieves the technical effects of preventing the drill bit from slipping during drilling, improving the drilling quality, and timely replacement of the drill bit during the drilling process, reducing the probability of drill bit breakage and increasing the service life of the drill bit.

[0038] The overall concept of the technical solution of this utility model embodiment is as follows:

[0039] An anti-slip film is coated on the upper surface of the aluminum foil. The hardness of the anti-slip film is less than that of the aluminum foil, but the roughness is greater. The drill bit first contacts the anti-slip film before drilling into the aluminum foil, effectively preventing slippage during drilling. The aluminum foil also provides heat dissipation for the circuit board and the high-speed rotating drill bit.

[0040] When a drill bit is used for drilling for an extended period, a drilling counting mechanism calculates the number of holes drilled. A higher cumulative drilling count indicates a longer working time for the drill bit. As the number of holes increases, the drill bit's temperature rises. Therefore, when a preset threshold is reached, the CNC tool-changing drilling machine automatically replaces the drill bit with a new one. After the new drill bit is installed, the drilling count is reset to zero. The replaced drill bit is placed in the tool slot to prevent overheating. In the initial preparation phase, operators compare the number of holes drilled with the detected drill bit temperature, and observe the generation of drill chips to set an appropriate preset threshold. This prevents a single drill bit from being used for drilling for an extended period.

[0041] To better understand the above technical solutions, the following will provide a detailed explanation of the technical solutions in conjunction with the accompanying drawings and specific implementation methods.

[0042] See Figures 1 to 11 The preferred embodiment of this utility model.

[0043] An improved device for micro-hole processing of circuit boards, comprising:

[0044] CNC tool-changing drilling machine 1, circuit board 21, drilled workpiece 2, and drilling counting mechanism 3;

[0045] The CNC tool-changing drilling machine 1 includes a frame 11, a three-axis moving assembly 12, a support base 13, a drilling control assembly 14, a slide 15, a spindle 16, an automatic drill clamp 17, and a workpiece positioning assembly 18.

[0046] The support base 13 is connected to the frame 11 via the three-coordinate moving assembly 12. The slide 15 is vertically connected to the support base 13. The spindle 16 is rotatably connected to the slide 15. The drilling control assembly 14 can control the lifting state of the slide 15 and the rotation state of the spindle 16. The automatic drill clamp 17 is installed at the lower end of the spindle 16. The workpiece positioning assembly 18 is installed on the frame 11 and is located below the automatic drill clamp 17. The workpiece 2 drilled by the circuit board 21 is installed on the workpiece positioning assembly 18.

[0047] The circuit board 21 drilling workpiece 2 includes a circuit board 21, an aluminum foil 22 and a pad 23. The circuit board 21 is placed on the upper surface of the pad 23, the aluminum foil 22 is placed on the upper surface of the circuit board 21, and the upper surface of the aluminum foil 22 is coated with an anti-slip film layer 221.

[0048] The drilling counting mechanism 3 includes a position sensor 31, a counter 32, and an MCU 33. The position sensor 31 is fixedly mounted on the support base 13 and is used to detect the slide 15. The position sensor 31 is electrically connected to the counter 32, the counter 32 is electrically connected to the MCU 33, and the MCU 33 is electrically connected to the drilling control component 14.

[0049] This invention features an anti-slip film layer 221 coated on the upper surface of the aluminum foil 22. The hardness of the anti-slip film layer 221 is less than that of the aluminum foil 22, while its roughness is greater. This effectively prevents the drill bit 4 from slipping during drilling, thus improving the quality of the hole and preserving the heat dissipation performance of the aluminum foil 22. The drilling counting mechanism 3 counts the number of times the drill bit 4 drills. When the preset threshold number is reached, a tool change signal is sent to the CNC tool changer drilling machine 1, which replaces the drill bit 4. This avoids the drill bit 4 from working for an extended period, thereby preventing the drill bit 4 from overheating. It also enables timely replacement of the drill bit 4 during the drilling process, reducing the probability of the drill bit 4 breaking and extending its service life.

[0050] The drilling control assembly 14 can control the lifting and lowering state of the slide 15. When the slide 15 moves downward, the automatic drill clamp 17 lowers with the drill bit 4 to drill into the circuit board 21 and drill the workpiece 2; when the slide 15 moves upward, the automatic drill clamp 17 raises with the drill bit 4 to leave the circuit board 21 and drill the workpiece 2. The drilling control assembly 14 can also control the rotation state of the spindle 16, including the forward rotation, reverse rotation, and speed of the spindle 16.

[0051] For example, the preset threshold number of drill passes is two thousand. When the slide 15 moves downward to its lowest point, it is within the detection area of ​​the position sensor 31. The position sensor 31 then sends a signal to the counter 32. The slide 15 repeatedly moves up and down, and the counter 32 accumulates the number of signals received from the position sensor 31, i.e., the cumulative number of drill passes. The counter 32 sends the accumulated number of drill passes to the MCU 33 via a signal. The MCU 33 has a preset threshold number of drill passes. It compares the number of drill passes of this drill pass with the preset threshold number. When the number of drill passes of this drill pass equals the preset threshold number, the MCU 33 sends a tool change signal to the drilling control component 14, and the drilling control component 14 stops the drilling operation. The CNC tool-changing drilling machine 1 changes the drill pass. After the automatic drill pass holder 17 changes to the new drill pass, the counter 32 resets the accumulated number of drill passes to zero.

[0052] The three-axis moving assembly 12 moves the support base 13 laterally, longitudinally, and vertically, changing the position of the support base 13 in space. The workpiece positioning assembly 18 includes a positioning plate 181 and a clamping plate 182 that is controlled by a cylinder to extend and retract. The positioning plate 181 is fixedly connected to the frame 11; the circuit board drilling workpiece 2 is placed between the positioning plate 181 and the clamping plate 182. The automatic drill bit clamping fixture 17 is used to automatically release the drill bit after receiving a tool change command from the existing technology control system of the CNC tool-changing drilling machine 1, and to automatically clamp the spare drill bit after it is inserted. The spindle 16 rotates the drill bit by means of the automatic drill bit clamping fixture 17.

[0053] The automatic drill bit clamp 17 includes a housing 171, a telescopic cylinder 172, a tool holder 173, a limiting ring 174, a sliding sleeve 175, a connecting rod 176, a clamping block 177, a limiting block 178, and a torsion spring. The housing 171 is fixedly connected to the sliding block 15. The housing 171 has a rotating hole. The tool holder 173 is located in the inner cavity of the housing 171. The lower end of the spindle 16 passes through the rotating hole and is also fixedly connected to the tool holder 173. The side wall of the tool holder 173 has a through hole. The lower end of the tool holder 173 has a mounting hole 1731. The top of the mounting hole 1731 has a strip-shaped guide groove. The limiting block 178 is hinged to the through hole. One end of the connecting rod 176 is hinged to the limiting block 178, and the other end of the connecting rod 176 is hinged to... The clamping block 177 is hinged and horizontally slidably connected to the through hole, and can also enter and exit the mounting hole 1731. The torsion spring is installed between the limiting block 178 and the through hole. The limiting ring 174 is fixedly disposed on the outer surface of the tool holder 173 and is also located below the limiting block 178. Multiple limiting blocks 178, connecting rods 176, clamping blocks 177, and through holes are evenly spaced around the axis of the tool holder 173. The sliding sleeve 175 is slidably connected to the tool holder 173 and is also located between the limiting ring 174 and the limiting block 178. The telescopic cylinder 172 is fixedly disposed on the housing 171. The telescopic rod of the telescopic cylinder 172 is used to push the sliding sleeve 175 upward and disengage it downward.

[0054] The shank 41 of the drill bit 4 has a strip-shaped guide protrusion 411 and a limiting plate 412. When the automatic drill bit clamp 17 needs to clamp the drill bit 4, the telescopic rod of the telescopic cylinder 172 pushes the sliding sleeve 175 upward. The sliding sleeve 175 rises and pushes the limiting block 178. The limiting block 178 moves the clamping block 177 outward through the connecting rod 176. At the same time, the torsion spring is in a torsional state. Then, the shank 41 of the drill bit 4 extends into the mounting hole 1731 of the tool holder 173. The strip-shaped guide protrusion 411 of the shank 41 engages with the strip-shaped guide groove of the mounting hole 1731. The circumferential rotation of the drill bit 4 is limited. During engagement, the spindle 18 allows the tool holder 173 to rotate slightly, which helps to ensure proper engagement. The telescopic rod of the telescopic cylinder 172 disengages downward from the sliding sleeve 175, the torsion spring 179 returns to its original position, the limiting block 178 pushes the sliding sleeve 175 downward, and the connecting rod 176 moves the clamping block 177 inward. The clamping block 177 contacts the bottom surface of the limiting plate 412 of the tool holder 41, preventing the tool holder 41 from disengaging from the mounting hole 1731. When the automatic drill bit clamp 17 needs to release the drill bit 4, the telescopic rod of the telescopic cylinder 172 pushes the sliding sleeve 175 upward, the sliding sleeve 175 pushes the limiting block 178 upward, and the connecting rod 176 moves the clamping block 177 outward, releasing the restriction on the tool holder 41. The drill bit 4 then disengages from the mounting hole 1731 under its own weight.

[0055] The MCU33 sends the tool change signal not only to the drilling control component 14, but also to the control system of the CNC tool-changing drilling machine 1. The control system of the CNC tool-changing drilling machine 1 coordinates the three-axis moving component 12, the drilling control component 14, and the automatic drill clamp 17 to perform the tool change action. During the tool change operation, the drilling control component 14 stops drilling, and the three-axis moving component 12 moves the automatic drill clamp 17 to the tool slot in the tool change area. The automatic drill clamp 17 releases the drill 4, and the drill falls into the tool slot. The automatic drill clamp 17 then moves to the position of the new drill, automatically clamps the new drill, and continues the drilling operation.

[0056] It also includes a loading cutter head 5 and a unloading cutter head 6, both of which are fixedly mounted on the frame 11. Both the loading cutter head 5 and the unloading cutter head 6 have slots for placing drill bits. The loading cutter head 5 holds multiple spare drill bits, and the unloading cutter head 6 has multiple empty slots 61. During tool changing, the automatic drill bit clamping fixture 17 first moves to the unloading cutter head 6, places the drill bit that has reached a preset threshold number of times in an empty slot of the unloading cutter head 6, and then moves to the position of the loading cutter head 5 to clamp the spare drill bit. The slot positions of the loading cutter head 5 and the unloading cutter head 6 are fixed. The automatic drill bit clamping fixture 17 moves sequentially to the slot positions of the loading cutter head 5 to clamp the spare drill bit, and sequentially moves to the slot positions of the unloading cutter head 6 to place the used drill bit, via the three-coordinate moving component 12.

[0057] The CNC tool changing drilling machine 1 also includes a drill bit gripping component 19 and a tool changing detection component 110. The drill bit gripping component 19 is fixedly installed on the slide 15 and is adjacent to the automatic drill bit clamp 17. The tool changing detection component 110 is fixedly installed on the frame 11 and is located between the loading cutter head 5 and the unloading cutter head 6.

[0058] The tool changing detection assembly 110 includes a detection seat 111, and a first transition tool groove 112, a second transition tool groove 123, and a drill bit detection sensor 124 disposed on the detection seat 111. The advantages of this technical solution are that the automatic drill bit clamp 17 is relatively large, and if it moves to the loading cutter head 5 to clamp a spare drill bit, it is prone to colliding with adjacent spare drill bits; the drill bit gripping assembly is smaller in size, making it easier to grip drill bits from the loading cutter head 5.

[0059] The drill bit gripping assembly 19 and the automatic drill bit clamping fixture 17 move simultaneously. The automatic drill bit clamping fixture 17 first places its own drill bit in the first transition groove 112. Then, the drill bit gripping assembly 19 moves to the position of the loading cutter disc 5, grips a spare drill bit, and then moves it to the second transition groove 123. The automatic drill bit clamping fixture 17 moves to the position of the drill bit detection sensor 124. The drill bit detection sensor 124 is used to detect whether the automatic drill bit clamping fixture 17 has a drill bit. If no drill bit is detected, the automatic drill bit clamping fixture 17 moves to the second transition groove 123. The drill bit is clamped at position 123 to retrieve a spare drill bit. If a drill bit is detected, the automatic drill bit clamp 17 returns to position 112 and releases the drill bit, placing it in 112. After the automatic drill bit clamp 17 retrieves the spare drill bit, the drill bit gripping component 19 moves to position 112 to retrieve the used drill bit, then moves to position 6 to place it in an empty slot 61 of the cutting disc. This effectively ensures smooth tool changing and avoids drill bit collisions. The drill bit gripping assembly 19 includes a pneumatic finger 191 and a gripping base 192. The fingertip 1911 of the pneumatic finger 191 slides back and forth in the through hole of the gripping base 192. When the fingertip 1911 of the pneumatic finger 191 contacts the bottom surface of the limiting plate 412 of the handle 41, it grips the drill bit 4; when the fingertip 1911 of the pneumatic finger 191 leaves the bottom surface of the limiting plate 412 of the handle 41, it releases the drill bit 4. The drill bit detection sensor 124 can be a photoelectric sensor.

[0060] The drilling control assembly 14 includes a first servo motor 141, a second servo motor 142, a lead screw 143, and a bearing 144. The first servo motor 141 is fixedly mounted on the support base 13, and its output shaft is connected to the slide 15 via the lead screw 143. The second servo motor 142 is fixedly mounted on the slide 15, and its output shaft is connected to the spindle 16 via a coupling. The bearing 144 is installed between the spindle 16 and the slide 15. The MCU 33 is electrically connected to the first servo motor 141 and the second servo motor 142. The rotational motion of the first servo motor 141 is converted into the lifting motion of the slide 15 via the lead screw 143; the second servo motor 142 rotates the drill bit via the spindle 16, controlling the drill bit's rotational speed.

[0061] The circuit board 21 is a copper-clad laminate.

[0062] There are three or more copper-clad laminates between the pad 23 and the aluminum foil 22.

[0063] The anti-slip film layer 221 is composed of a mixture of polymer resin and lubricant.

[0064] The working principle of this utility model is as follows:

[0065] (1) Prepare the circuit board drilling workpiece 2, which consists of, from bottom to top: a pad 23, three copper-clad laminates, and an aluminum foil 22 coated with an anti-slip film layer 221. Place the circuit board 21 drilling workpiece 2 into the workpiece positioning assembly 18 of the CNC tool changer drilling machine 1. Input the preset number of times threshold into the MCU 33.

[0066] (2) Start the CNC tool-changing drilling machine 1. Through the three-axis moving component 12, the automatic drill holder 17 moves the drill bit to the top of the workpiece 2 on the circuit board 21. The second servo motor 142 rotates the tool holder 173 of the automatic drill holder 17 through the spindle 16. The first servo motor 141 moves the slide 15 up and down through the lead screw 143, so that the rotating drill bit 4 drills into the workpiece 2 on the circuit board. The drill bit 4 drills into the anti-slip film layer, aluminum foil, the first copper-clad laminate, the second copper-clad laminate, the third copper-clad laminate, and the pad in sequence. The drill bit 4 then rises again; thus, a single drilling action can drill holes in all three copper-clad laminates.

[0067] (3) Position sensor 31 detects slide 15, counter 32 accumulates the number of times the current drill bit drills, MCU 33 compares the number of times the current drill bit drills with the preset number threshold, and when the preset number threshold is reached, MCU 33 sends a tool change signal.

[0068] (4) The automatic drill clamp 17 and the drill gripper assembly 19 complete the tool changing action between the loading cutter head 5, the tool changing detection assembly 110, and the unloading cutter head 6. The counter 32 resets the accumulated drilling count to zero, and the automatic drill clamp 17 continues drilling operations with the spare drill bit.

[0069] To prevent a single drill bit from operating for an extended period, thus avoiding overheating and degrading hole wall quality; to prevent drill bit slippage during drilling, thereby improving hole position accuracy, reducing the likelihood of drill bit breakage, and extending drill bit lifespan.

[0070] While specific embodiments of the present invention have been described above, those skilled in the art should understand that the specific embodiments described are merely illustrative and not intended to limit the scope of the present invention. Equivalent modifications and variations made by those skilled in the art in accordance with the spirit of the present invention should be covered within the scope of protection of the claims of the present invention.

Claims

1. An improved device for micro-hole processing of circuit boards, characterized in that, The utility model relates to a numerical control tool changing drilling machine, circuit board drilling workpiece and drilling counting mechanism. The numerical control tool changing drilling machine comprises a rack, a three-coordinate moving assembly, a supporting seat, a drilling control assembly, a sliding seat, a main shaft, a drill automatic clamp and a workpiece positioning assembly. The supporting seat is connected with the rack through the three-coordinate moving assembly, the sliding seat is connected with the supporting seat in an elevating mode, the main shaft is connected with the sliding seat in a rotating mode, the drilling control assembly can control the elevating state of the sliding seat and the rotating state of the main shaft, the drill automatic clamp is installed at the lower end of the main shaft, the workpiece positioning assembly is installed on the rack and below the drill automatic clamp, and the circuit board drilling workpiece is installed on the workpiece positioning assembly. The circuit board drilling workpiece comprises a circuit board, an aluminum foil and a backing plate, the circuit board is placed on the upper surface of the backing plate, the aluminum foil is placed on the upper surface of the circuit board, and the upper surface of the aluminum foil is plated with an antiskid film layer. The drilling counting mechanism comprises a position sensor, a counter and an MCU, the position sensor is fixedly arranged on the supporting seat and used for detecting the sliding seat, the position sensor is electrically connected with the counter, the counter is electrically connected with the MCU, and the MCU is electrically connected with the drilling control assembly. Further comprising:

2. The improved apparatus for processing micro-holes of a circuit board according to claim 1, wherein The upper feeding cutter disc and the lower feeding cutter disc are both fixedly arranged on the rack, and both have cutter grooves for placing drills. The numerical control tool changing drilling machine further comprises a drill grabbing assembly and a tool changing detection assembly, the drill grabbing assembly is fixedly arranged on the sliding seat and adjacent to the drill automatic clamp, and the tool changing detection assembly is fixedly arranged on the rack and between the upper feeding cutter disc and the lower feeding cutter disc.

3. The improved apparatus for processing micro-holes of a circuit board according to claim 2, wherein The tool changing detection assembly comprises a detection seat, a first transition cutter groove, a second transition cutter groove and a drill detection sensor arranged on the detection seat. The circuit board is a copper-clad plate.

4. The improved apparatus for processing micro-holes of a circuit board according to claim 1, wherein There are more than three copper-clad plates between the backing plate and the aluminum foil.

5. The improved apparatus for processing micro-holes of a circuit board according to claim 4, wherein The antiskid film layer is formed by mixing high molecular resin and lubricant.

6. The improved apparatus for processing micro-holes of a circuit board according to claim 1, wherein, ​

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