Hole processing method and hole processing device for printed circuit board

Abstract

The invention provides a hole processing method and a hole processing device for a printed circuit board, and relates to the technical field of printed circuit boards. The invention aims to solve the technical problem that more burrs are generated when hole processing is carried out on the printed circuit board in the prior art. According to the technical scheme, the hole machining method for the printed circuit board comprises the following steps that a base plate is fixed to the table top of a workbench; laying a printed circuit board to be processed on the upper surface of the base plate; laying a pressing plate on the upper surface of the printed circuit board; preliminarily fixing the pressing plate and the printed circuit board on the upper surface of the base plate through a paper adhesive tape; and enabling the cutter to penetrate through the pressing plate, and carrying out hole processing on the printed circuit board. The hole processing method comprises the following steps: firstly, laying a backing plate below the printed circuit board, and laying a pressing plate above the printed circuit board; and then hole processing is carried out on the printed circuit board, so that burrs generated in the hole processing process of the printed circuit board can be reduced. In addition, the invention also provides a hole processing device of the printed circuit board, which is matched with the hole processing method.

Description

Technical Field

[0001] The present invention relates to the technical field of a method for manufacturing a printed circuit board and a manufacturing device, and in particular to a method for processing holes in a printed circuit board and a hole processing device. Background Art

[0002] When manufacturing a printed circuit board with a multi-layer structure, it is necessary to process blind holes or through holes in the printed circuit board; then copper is plated in the holes to form conductive holes, thereby connecting the circuits between layers.

[0003] When processing blind holes or through holes on printed circuit boards, a common problem is that printed circuit boards are prone to burrs during the hole processing process. Burrs are also called burrs, which will have an adverse effect on subsequent copper plating and thus have an adverse effect on the conduction performance of the through holes. Among them, the burrs are most serious at the hole ends of blind holes or through holes close to the surface of the printed circuit board.

[0004] Based on this, it is necessary to improve the hole processing method and hole processing device of the printed circuit board to reduce the flash generated during the hole processing of the printed circuit board. Summary of the invention

[0005] The object of the present invention is to provide a hole processing method for a printed circuit board, which can reduce the flash generated during the hole processing of the printed circuit board, and is conducive to improving the product quality and electrical performance of the printed circuit board. Based on the same inventive concept, another object of the present invention is to provide a hole processing device for a printed circuit board.

[0006] To achieve the above object, the technical solution adopted by the present invention is: A method for processing a hole of a printed circuit board comprises the following steps: S1: Fix the pad on the table top of the workbench; S2: Laying the printed circuit board to be processed on the upper surface of the pad; S3: Laying the pressing plate on the upper surface of the printed circuit board; S4: Preliminarily fix the pressing plate and the printed circuit board on the upper surface of the pad by paper tape; S5: The tool penetrates the pressure plate to perform hole processing on the printed circuit board.

[0007] Optionally, in step S5, the dust cover is first pressed against the upper surface of the pressure plate to perform secondary fixation on the pressure plate, the printed circuit board and the pad; then the tool is allowed to perform hole processing on the printed circuit board in the dust cover; and air is blown into the blind holes or through holes in the hole processing process in the dust cover to blow out the powder in the blind holes or through holes.

[0008] Optionally, in step S5, the rotating tool is first moved downward to the upper surface of the pressure plate; then the tool is alternately advanced downward and retracted upward until a blind hole or a through hole of a predetermined depth is processed on the printed circuit board; finally, the tool is retracted from the processed blind hole or through hole and reset upward; wherein, the aperture of the blind hole or through hole is denoted as d, and the amount of tool retraction each time is denoted as h, then the amount of tool feed each time is 2h, and 2h≤d≤16h.

[0009] Optionally, the pressing plate is made of an aluminum plate with a thickness of 0.3±0.1mm; the pad is made of a wooden plate with a thickness of 2±0.5mm.

[0010] The present application also provides a hole processing device for a printed circuit board, which includes: a tool, a rotating motor that drives the tool to rotate, a first walking mechanism that drives the rotating motor to move up and down, a second walking mechanism that drives the first walking mechanism to move up and down, a third walking mechanism that drives the second walking mechanism to move left and right, and a fourth walking mechanism that drives the third walking mechanism to move forward and backward; wherein, the first walking mechanism is installed on a slide, and the second walking mechanism drives the first walking mechanism to move up and down by driving the slide to move up and down; a dust cover is installed at the lower part of the slide, and a tool hole for the tool to pass through is provided on the top of the dust cover; a nozzle is installed in the dust cover to blow air into the blind hole or through hole processed by the tool; the dust cover is provided with an exhaust interface to connect with an exhaust hose.

[0011] Optionally, it also includes: a corrugated hose; the dust cover is provided with a knife cylinder extending upward at the knife hole; the lower end of the corrugated hose is connected to the knife cylinder, and the upper end is connected to the housing of the rotating motor; the rotating motor drives the knife holder to rotate, thereby driving the knife to rotate; the knife and the knife holder are separated from the outside world by the corrugated hose.

[0012] Optionally, the nozzle includes: a horizontal pipe section, a vertical pipe section extending downward from the left end of the horizontal pipe section, and an air jet head extending obliquely to the lower left from the lower end of the vertical pipe section; the intersection of the buckling surface of the dust cover and the axis of the tool is used as a reference point, and the air jet head points to the reference point; the right end of the horizontal pipe section is rotatably connected to one end of the rotary joint, and the other end of the rotary joint passes through the dust cover to be connected to an air intake hose; the nozzle is provided with a toggle portion extending forward or backward from the left end of the horizontal pipe section; when the tool holder moves downward to drive the toggle portion to rotate downward around the axis of the horizontal pipe section, the air jet head rotates upward around the axis of the horizontal pipe section to avoid the blade and the tool sheath of the tool.

[0013] Optionally, a conductive member and a limiting member are provided in the knife cylinder; the conductive member includes: a vertical rod portion, and a first horizontal portion extending from the vertical rod portion into the knife cylinder; the limiting member is provided with a limiting groove extending vertically therethrough to accommodate the vertical rod portion of the conductive member; the limiting member is fixedly connected to the inner wall of the knife cylinder, and cooperates with the inner wall of the knife cylinder to limit the vertical rod portion in the limiting groove; the limiting member is provided with two upper and lower members, and the first horizontal portion is located between the two limiting members; when the knife seat moves downward to drive the first horizontal portion to move downward, the conductive member is driven to drive the toggle portion to rotate downward around the axis of the horizontal tube section; the conductive member is adapted to drive the elastic member to reset itself upward.

[0014] Optionally, the conductive member also includes: a second transverse portion; two ends of the second transverse portion extend from the vertical rod portion in the front-to-rear direction along the inner circumference of the knife cylinder to cooperate with the inner wall of the knife cylinder to prevent the conductive member from rotating around the vertical rod portion; the second transverse portion is arranged between the two limit members, or above the two limit members; the elastic member is arranged as a compression spring, and is sleeved on the vertical rod portion of the conductive member; the lower one of the two limit members supports the lower end of the compression spring; the upper end of the compression spring supports the first transverse portion or the second transverse portion.

[0015] Optionally, the dust cover includes: a cover body, an elastic ring installed at the bottom of the cover body, and a hard ring installed at the bottom of the elastic ring; a first annular dovetail groove is provided at the bottom of the cover body, and a first convex ring matching with the first annular dovetail groove is provided at the top of the elastic ring; a second annular dovetail groove is provided at the top of the hard ring, and a second convex ring matching with the second annular dovetail groove is provided at the bottom of the elastic ring.

[0016] The beneficial effects of the present invention are concentrated in the following aspects: before hole processing on the printed circuit board; first lay a cushion plate under the printed circuit board, lay a pressure plate above the printed circuit board, and fix them; then process the holes on the printed circuit board; by this method, blind holes or through holes are processed on the printed circuit board, and the flash of the blind holes or through holes near the hole ports on the surface of the printed circuit board will be greatly reduced. In addition, the present invention blows air into the blind holes or through holes in the hole processing process, and can blow out the powder and chips in the blind holes or through holes in time during the hole processing process, thereby reducing the flash of the hole wall and improving the smoothness of the hole wall. In summary, the present invention can reduce the flash generated by the printed circuit board during the hole processing process, which is beneficial to improving the product quality and electrical performance of the printed circuit board. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0018] Figure 1 It is a structural schematic diagram of a hole processing device for a printed circuit board; Figure 2 The figure is a schematic diagram of the assembly of the sliding seat and the dust cover; Figure 3 It is a schematic diagram of the assembly of the rotating motor, the dust cover and the corrugated hose; Figure 4 is a schematic diagram of the structure of the tool; Figure 5 A schematic diagram of a nozzle disposed in a dust cover; Figure 6 It is a schematic diagram of setting a conducting member in a knife cylinder; Figure 7 It is a schematic diagram of the distribution of the tool holder, the conductive part and the nozzle; Figure 8 It is a schematic diagram of the structure of the conducting part and the nozzle; Fig. 9 A schematic diagram of providing a first convex ring for an elastic ring; Fig.10 A schematic diagram of providing a second convex ring for the elastic ring; 1. Tool; 2. Rotating motor; 3. First travelling mechanism; 4. Second travelling mechanism; 5. Third travelling mechanism; 6. Fourth travelling mechanism; 7. Sliding seat; 8. Dust cover; 9. Nozzle; 10. Exhaust interface; 11. Corrugated hose; 12. Cutter barrel; 13. Cutter seat; 14. Horizontal pipe section; 15. Vertical pipe section; 16. Injection nozzle; 17. Rotary joint; 18. Toggle part; 19. Blade; 20. Cutter sleeve; 21. Conducting part; 22. Limiting part; 23. Vertical rod part; 24. First horizontal part; 25. Second horizontal part; 26. Compression spring; 27. Cover body; 28. Elastic ring; 29. ​​Hard ring; 30. First annular dovetail groove; 31. First convex ring; 32. Second annular dovetail groove; 33. Second convex ring; 34. Counterweight part; 35. Ring part; 36. Cutter head. DETAILED DESCRIPTION

[0019] In the following, only some exemplary embodiments are briefly described. As those skilled in the art will appreciate, the described embodiments may be modified in various ways without departing from the spirit or scope of the present invention. Therefore, the drawings and descriptions are considered to be exemplary and non-restrictive in nature.

[0020] In the description of the present invention, it is necessary to understand that the directions or positional relationships indicated by the terms "front", "rear", "left", "right", etc. are based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as a limitation on the present invention.

[0021] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0022] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be directly connected or indirectly connected through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0023] The embodiments of the present invention are described in detail below with reference to the accompanying drawings.

[0024] Example 1

[0025] An embodiment of the present invention provides a method for processing a hole in a printed circuit board, which comprises the following steps: S1: Fix the pad on the table top of the workbench; S2: Laying the printed circuit board to be processed on the upper surface of the pad; S3: Laying the pressing plate on the upper surface of the printed circuit board; S4: Preliminarily fix the pressing plate and the printed circuit board on the upper surface of the pad by paper tape; S5: The tool 1 penetrates the press plate to perform hole processing on the printed circuit board.

[0026] It should be understood that before hole processing on the printed circuit board, a pad is first placed under the printed circuit board, and a pressure plate is placed above the printed circuit board, and fixed; and then the printed circuit board is hole processed; by this method, blind holes or through holes are processed on the printed circuit board, and the flash of the blind holes or through holes near the hole ports on the surface of the printed circuit board will be greatly reduced, which is conducive to improving the product quality and electrical performance of the printed circuit board. In addition, the hole processing method of the printed circuit board can be completed by using the hole processing device of the printed circuit board described in any one of Examples 5 to 10.

[0027] Example 2

[0028] On the basis of Example 1; in step S5, the dust cover 8 is first pressed on the upper surface of the pressure plate to perform secondary fixation on the pressure plate, the printed circuit board and the pad; then the tool 1 is allowed to perform hole processing on the printed circuit board in the dust cover 8; and air is blown into the blind hole or through hole in the hole processing process in the dust cover 8 to blow out the powder in the blind hole or through hole.

[0029] It should be understood that the present invention blows air into the blind hole or through hole in the process of hole processing, and can blow out the powder in the blind hole or through hole in time during the process of hole processing, thereby reducing the flash of the hole wall and improving the smoothness of the hole wall; this is beneficial to improving the product quality and electrical performance of the printed circuit board. A nozzle 9 can be installed in the dust cover 8 to blow air into the blind hole or through hole in the process of hole processing. In addition, an exhaust interface 10 can be provided in the dust cover 8, and the exhaust interface 10 can be connected to the exhaust pump through an exhaust hose; in this way, the flying powder in the dust cover 8 can be sucked away. Usually, the air flow rate of exhaust per unit time can be slightly larger than the air flow rate of blowing, so as to form a negative pressure in the dust cover 8 to prevent the powder in the dust cover 8 from escaping from the gap.

[0030] Example 3

[0031] On the basis of Example 1 or Example 2; in step S5, first move the rotating tool 1 downward to the upper surface of the pressure plate; then make the tool 1 alternately advance downward and retreat upward until a blind hole or a through hole of a predetermined depth is processed on the printed circuit board; finally, make the tool 1 retreat from the processed blind hole or through hole and reset upward; wherein, the aperture of the blind hole or through hole is recorded as d, and the retreat amount of the tool 1 each time is recorded as h, then the advance amount of the tool 1 each time is 2h, and 2h≤d≤16h.

[0032] It should be understood that by adopting this processing method, the tool 1 is alternately advanced downward and retracted upward, which can further reduce the flash of the blind hole or through hole processed in the printed circuit board, and is conducive to timely blowing out the powder in the blind hole or through hole during the hole processing process.

[0033] Example 4

[0034] On the basis of any one of Examples 1 to 3, the pressing plate is made of an aluminum plate with a thickness of 0.3±0.1 mm; the pad is made of a wooden plate with a thickness of 2±0.5 mm.

[0035] It should be understood that using a harder aluminum plate as a pressure plate to press on the upper surface of the printed circuit board and using a softer wooden board as a pad to pad on the lower surface of the printed circuit board can further reduce the flash of the blind holes or through holes processed in the printed circuit board.

[0036] Example 5

[0037] like Figure 1 to Figure 3 As shown, an embodiment of the present invention provides a hole processing device for a printed circuit board, which can be used for the hole processing method for a printed circuit board described in any one of Embodiments 1 to 4. The hole processing device comprises: a tool 1, a rotary motor 2 driving the tool 1 to rotate, a first walking mechanism 3 driving the rotary motor 2 to move up and down, a second walking mechanism 4 driving the first walking mechanism 3 to move up and down, a third walking mechanism 5 driving the second walking mechanism 4 to move left and right, and a fourth walking mechanism 6 driving the third walking mechanism 5 to move forward and backward; wherein, the first walking mechanism 3 is installed on a slide 7, and the second walking mechanism 4 drives the first walking mechanism 3 to move up and down by driving the slide 7 to move up and down; a dust cover 8 is installed at the lower part of the slide 7, and a tool hole for the tool 1 to pass through is provided at the top of the dust cover 8; a nozzle 9 is installed in the dust cover 8 to blow air into the blind hole or through hole processed by the tool 1; the dust cover 8 is provided with an exhaust interface 10 to communicate with an exhaust hose.

[0038] It should be understood that the first travel mechanism 3 can be configured as a combination of a servo motor and a ball screw, or a linear motor; the same is true for the second travel mechanism 4, the third travel mechanism 5, and the fourth travel mechanism 6. In addition, the first travel mechanism 3, the second travel mechanism 4, the third travel mechanism 5, and the fourth travel mechanism 6 can cooperate with the PLC controller to realize automatic control of the stroke through preset parameters. On the table of the workbench, the pad, the printed circuit board, and the pressure plate are laid out from bottom to top in sequence, and initially fixed with paper tape; the dust cover 8 and the tool 1 can be moved to the predetermined position by the third travel mechanism 5 and the fourth travel mechanism 6; then, the second travel mechanism 4 drives the slide 7 with the dust cover 8 and the tool 1 to move downward, so that the dust cover 8 is buckled on the upper surface of the pressure plate; then, the first travel mechanism 3 can drive the tool 1 to alternately advance downward and withdraw upward, thereby processing a blind hole or through hole of a predetermined depth in the printed circuit board. The rotary motor 2 is usually configured as a servo motor. In addition, when the dust cover 8 is buckled on the upper surface of the pressure plate, air can be blown into the blind hole or through hole processed by the tool 1 through the nozzle 9 to blow out the powder in the blind hole or through hole, and air can be sucked out through the exhaust interface 10 to remove the flying powder in the dust cover 8. Usually, the air flow rate of the suction can be slightly larger than the air flow rate of the blowing per unit time to form a negative pressure in the dust cover 8 to prevent the powder in the dust cover 8 from escaping from the gap. The nozzle 9 can be connected to the air storage tank through an air intake hose, and the air storage tank is equipped with a booster pump and a solenoid valve or an electric valve, so that the nozzle 9 can be supplied with or cut off air. The exhaust interface 10 can be connected to the exhaust pump through an exhaust hose and connected to the dust separation equipment to separate the powder from the air flow.

[0039] Example 6

[0040] like Figure 1 to Figure 3 As shown, on the basis of Example 5; the hole processing device also includes: a corrugated hose 11; the dust cover 8 is provided with a tool cylinder 12 extending upward at the tool hole; the lower end of the corrugated hose 11 is connected to the tool cylinder 12, and the upper end is connected to the housing of the rotating motor 2; the rotating motor 2 drives the tool 1 to rotate by driving the tool holder 13 to rotate; the tool 1 and the tool holder 13 are separated from the outside world by the corrugated hose 11.

[0041] It should be understood that when the corrugated hose 11 is not provided, in order to prevent a large amount of airflow from flowing into the dust cover 8 from the knife hole to interfere with the normal operation of the nozzle 9, or to prevent a large amount of airflow from flowing out of the knife hole to bring out dust and pollute the working environment, it is necessary to limit the size of the knife hole so that the aperture of the knife hole is close to the diameter of the knife seat 13 to reduce the gap between the two. This will in turn bring about another problem. Dust and dust are easily retained in the gap between the knife hole and the knife seat 13, affecting the up and down movement of the knife seat 13, and may have an adverse effect on the processing accuracy of the tool 1. By providing the corrugated hose 11, the size limit of the knife hole can be relaxed and all the above problems can be solved. In addition, an annular portion 35 surrounding the knife seat 13 can be provided at the bottom of the housing of the rotating motor 2 for the upper end of the corrugated hose 11 to be sleeved, and the lower end of the corrugated hose 11 can be sleeved on the knife cylinder 12.

[0042] Example 7

[0043] like Figures 4 to 8 As shown, on the basis of Example 6; the nozzle 9 includes: a horizontal pipe section 14, a vertical pipe section 15 extending downward from the left end of the horizontal pipe section 14, and a nozzle 16 extending obliquely to the lower left from the lower end of the vertical pipe section 15; with the intersection of the buckling surface of the dust cover 8 and the axis of the tool 1 as the reference point, the nozzle 16 points to the reference point; the right end of the horizontal pipe section 14 is rotatably connected to one end of the rotary joint 17, and the other end of the rotary joint 17 passes through the dust cover 8 to be connected to the air intake hose; the nozzle 9 is provided with a toggle portion 18 extending forward or backward from the left end of the horizontal pipe section 14; when the tool holder 13 moves downward to drive the toggle portion 18 to rotate downward around the axis of the horizontal pipe section 14, the nozzle 16 rotates upward around the axis of the horizontal pipe section 14 to avoid the blade 19 and the tool sleeve 20 of the tool 1.

[0044] It should be understood that a printed circuit board with a more complex structure design often has a large number of through holes; accordingly, a large number of blind holes or through holes need to be processed on the printed circuit board; and the tool 1 needs to be replaced after processing a certain number of blind holes or through holes. Among them, the automatic tool changing structure of the tool holder 13 is a mature existing technology and is not an improvement point of the present application, and its structure and principle are not repeated here. When the tool 1 is automatically replaced, the tool holder 13 needs to be moved up and down to put the used tool 1 downward into the tool box, and the new tool 1 in the tool box is inserted upward into the tool holder 13. At the same time, since the size of the through hole of the printed circuit board is very small, and in order to facilitate the installation of the tool 1; therefore, the tool 1 has the characteristics of a thin blade 36 and a thick blade 19, and the blade 19 of the tool 1 is also provided with a circle of blade sleeve 20 with a larger diameter. On the other hand, since the vacuum pump draws air from the dust cover 8 to the outside through the exhaust interface 10; in order to make the nozzle 9 work better, it is necessary to make the lower end of the nozzle 16 of the nozzle 9 as close to the blade 36 of the tool 1 as possible. In this way, when the tool 1 is automatically replaced, the air jet 16 of the nozzle 9 may hinder the blade 19 or the tool sleeve 20 of the tool 1 from passing in the up and down direction. The present invention utilizes the characteristic that the tool holder 13 will move downward significantly when the tool 1 is replaced, and sets the nozzle 9 of the above structure; when the tool holder 13 moves downward significantly to apply force to the toggle portion 18 of the nozzle 9, the toggle portion 18 will be driven to rotate downward around the axis of the transverse tube section 14, thereby driving the air jet 16 to rotate upward around the axis of the transverse tube section 14, so that the air jet 16 is away from the tool 1, thereby avoiding the blade 19 and the tool sleeve 20 of the tool 1. In this way, within the limited space of the dust cover 8, it is possible to both blow air as close to the tool head 36 as possible during hole processing and avoid the tool 1 when changing the tool. It should be noted that when the tool 1 is processing a hole, the amplitude of the up and down movement is not large. At this time, the tool holder 13 will not touch the toggle part 18 of the nozzle 9; when changing the tool, the tool holder 13 moves downward significantly to touch the toggle part 18 of the nozzle 9. In addition, the nozzle 9 can be provided with a counterweight part 34 on the side opposite to the toggle part 18, so that the nozzle 9 can keep the nozzle head 16 pointing to the reference point under its own weight when the external force applied by the tool holder 13 is not applied. Of course, a torsion spring coaxial with the cross pipe section 14 can also be provided, and the nozzle 9 can be reset by the elastic force applied by the torsion spring, so that the nozzle 9 can keep the nozzle head 16 pointing to the reference point when the external force applied by the tool holder 13 is not applied. In addition, regarding the buckling surface of the dust cover 8; taking the dust cover 8 buckled on the upper surface of the pressure plate as an example, at this time, the upper surface of the pressure plate can be regarded as the buckling surface.

[0045] Example 8

[0046] like Figures 5 to 8As shown, on the basis of Example 7; a conductive member 21 and a limiting member 22 are provided in the knife cylinder 12; the conductive member 21 includes: a vertical rod portion 23, and a first horizontal portion 24 extending from the vertical rod portion 23 to the inside of the knife cylinder 12; the limiting member 22 is provided with a limiting groove running through the vertical rod portion 23 to accommodate the vertical rod portion 23 of the conductive member 21; the limiting member 22 is fixedly connected to the inner wall of the knife cylinder 12, and cooperates with the inner wall of the knife cylinder 12 to limit the vertical rod portion 23 in the limiting groove; the limiting member 22 is provided with two upper and lower ones, and the first horizontal portion 24 is located between the two limiting members 22; when the knife seat 13 moves downward to drive the first horizontal portion 24 to move downward, it drives the conductive member 21 to drive the toggle portion 18 to rotate downward around the axis of the horizontal tube section 14; the conductive member 21 is adapted to drive the elastic member to reset it upward.

[0047] It should be understood that the limiter 22 can be fixed to the inner wall of the knife barrel 12 by welding, bonding, bolting, etc. When the knife seat 13 applies force to the toggle portion 18 by directly contacting the toggle portion 18, the size of the toggle portion 18 needs to be designed to be larger; and the toggle portion 18 needs to rotate around the transverse tube section 14, so that a larger space is required in the knife barrel 12 and the dust cover 8. By setting the conductive member 21, and making the first transverse portion 24 of the conductive member 21 block the moving path of the knife seat 13; when the knife seat 13 moves downward significantly, it can contact the first transverse portion 24, thereby driving the first transverse portion 24 to move downward with the conductive member 21, and then drive the toggle portion 18 to rotate around the transverse tube section 14; in this way, the size of the toggle portion 18 can be greatly reduced to better adapt to the narrow space in the knife barrel 12 and the dust cover 8.

[0048] Example 9

[0049] like Figure 7 , Figure 8 As shown, on the basis of Example 8; the conductive member 21 also includes: a second transverse portion 25; the two ends of the second transverse portion 25 extend from the vertical rod portion 23 along the inner circumference of the knife cylinder 12 in the front and rear directions respectively, so as to cooperate with the inner wall of the knife cylinder 12 to prevent the conductive member 21 from rotating around the vertical rod portion 23; the second transverse portion 25 is arranged between the two limit members 22, or arranged above the two limit members 22; the elastic member is arranged as a compression spring 26, and is sleeved on the vertical rod portion 23 of the conductive member 21; the one located at the lower end of the two limit members 22 supports the lower end of the compression spring 26; the upper end of the compression spring 26 supports the first transverse portion 24 or the second transverse portion 25.

[0050] It should be understood that when the first transverse portion 24 is located below the second transverse portion 25, the upper end of the compression spring 26 supports the first transverse portion 24; when the first transverse portion 24 is located above the second transverse portion 25, the upper end of the compression spring 26 supports the second transverse portion 25; when the first transverse portion 24 is flush with the second transverse portion 25, the upper end of the compression spring 26 supports both the first transverse portion 24 and the second transverse portion 25. When the knife seat 13 is separated from the conductive member 21, the conductive member 21 can be reset upward under the action of the compression spring 26. In addition, the upper one of the two limiting members 22 will limit the first transverse portion 24 or the second transverse portion 25. The second transverse portion 25 can prevent the conductive member 21 from rotating around the vertical rod portion 23, thereby preventing the first transverse portion 24 from deviating from the moving path of the knife seat 13, so as to prevent the knife seat 13 from being unable to drive the first transverse portion 24 to move downward when the knife seat 13 moves downward significantly.

[0051] Example 10

[0052] like Fig. 9 , Fig.10 As shown, on the basis of any one of Examples 5 to 9; the dust cover 8 includes: a cover body 27, an elastic ring 28 installed at the bottom of the cover body 27, and a hard ring 29 installed at the bottom of the elastic ring 28; a first annular dovetail groove 30 is provided at the bottom of the cover body 27, and a first convex ring 31 matching with the first annular dovetail groove 30 is provided at the top of the elastic ring 28; a second annular dovetail groove 32 is provided at the top of the hard ring 29, and a second convex ring 33 matching with the second annular dovetail groove 32 is provided at the bottom of the elastic ring 28.

[0053] It should be understood that the elastic ring 28 can be made of elastic materials such as rubber and elastic plastic, and the hard ring 29 can be made of hard materials such as metal and hard plastic. In addition to playing a secondary fixing role for the pressing plate, printed circuit board and pad, the dust cover 8 also plays a role in preventing dust from flying and polluting the processing environment. The elastic ring 28 and the hard ring 29 are arranged in sequence from top to bottom at the bottom of the dust cover 8. On the one hand, the elasticity of the elastic ring 28 can be used to prevent the printed circuit board from being damaged and deformed due to forced pressing. On the other hand, the hard ring 29 and the pressing plate are not completely sealed, and there is a small gap for airflow to enter; after the hole processing is completed, the nozzle 9 will be closed first, and then the air extraction will be stopped; in this way, the dust cover 8 and the pressing plate can be prevented from being sucked together, and the dust cover 8 can be prevented from pulling the pressing plate upward when it moves upward. If necessary, the bottom surface of the hard ring 29 can be set to a rough surface; to ensure that when the dust cover 8 is in the buckling state, there is a gap between the bottom surface of the hard ring 29 and the buckled object for airflow to enter.

[0054] Although specific embodiments of the present invention are described above, those skilled in the art should understand that various changes or modifications may be made to these embodiments without departing from the principles and essence of the present invention, and these changes and modifications are all within the scope of protection of the present invention.

Claims

1. A method for processing a hole in a printed circuit board, characterized in that: The following steps are involved: S1: Fix the pad on the table top of the workbench; S2: Laying the printed circuit board to be processed on the upper surface of the pad; S3: Laying the pressing plate on the upper surface of the printed circuit board; S4: Preliminarily fix the pressing plate and the printed circuit board on the upper surface of the pad by paper tape; S5: The tool (1) penetrates the pressure plate to perform hole processing on the printed circuit board.

2. The method for processing a hole in a printed circuit board according to claim 1, characterized in that: In step S5, the dust cover (8) is first pressed against the upper surface of the pressing plate to perform secondary fixation on the pressing plate, the printed circuit board and the backing plate; then the tool (1) is used to perform hole processing on the printed circuit board in the dust cover (8); and air is blown into the blind hole or through hole in the hole processing process in the dust cover (8) to blow out the powder in the blind hole or through hole.

3. The method for processing a hole in a printed circuit board according to claim 1 or 2, characterized in that: In step S5, the rotating tool (1) is first moved downward to the upper surface of the pressing plate; then the tool (1) is alternately moved downward and upward until a blind hole or a through hole of a predetermined depth is machined on the printed circuit board; finally, the tool (1) is withdrawn from the machined blind hole or through hole and reset upward; The diameter of the blind hole or through hole is denoted as d, and the amount of retraction of the tool (1) each time is denoted as h. Then, the amount of advance of the tool (1) each time is 2h, and 2h≤d≤16h.

4. The method for processing a hole in a printed circuit board according to claim 1, characterized in that: The pressing plate is made of aluminum plate with a thickness of 0.3±0.1mm; the pad is made of wood plate with a thickness of 2±0.5mm.

5. A hole processing device for a printed circuit board, characterized in that: include: Knife (1); and A rotary motor (2) for driving the tool (1) to rotate; and A first walking mechanism (3) driving the rotating motor (2) to move up and down; and a second walking mechanism (4) for driving the first walking mechanism (3) to move up and down; and a third walking mechanism (5) for driving the second walking mechanism (4) to move left and right; and a fourth walking mechanism (6) for driving the third walking mechanism (5) to move forward and backward; in, The first walking mechanism (3) is mounted on a slide seat (7), and the second walking mechanism (4) drives the slide seat (7) to move up and down, thereby driving the first walking mechanism (3) to move up and down; A dust cover (8) is installed at the bottom of the slide seat (7), and a tool hole for the tool (1) to pass through is provided at the top of the dust cover (8); A nozzle (9) is installed in the dust shield (8) to blow air toward the blind hole or through hole processed by the tool (1); The dust cover (8) is provided with an exhaust interface (10) for communicating with an exhaust hose.

6. The hole processing device for a printed circuit board according to claim 5, characterized in that: Also included: a corrugated hose (11); The dust cover (8) is provided with a knife-passing cylinder (12) extending upward at the knife-passing hole; The lower end of the corrugated hose (11) is connected to the knife cylinder (12), and the upper end is connected to the housing of the rotating motor (2); The rotary motor (2) drives the tool holder (13) to rotate, thereby driving the tool (1) to rotate; the tool (1) and the tool holder (13) are separated from the outside world by a corrugated hose (11).

7. The hole processing device for a printed circuit board according to claim 6, characterized in that: The nozzle (9) comprises: a horizontal pipe section (14), a vertical pipe section (15) extending downward from the left end of the horizontal pipe section (14), and a spray head (16) extending obliquely toward the lower left from the lower end of the vertical pipe section (15); The intersection of the pressing surface of the dust cover (8) and the axis of the tool (1) is taken as a reference point, and the nozzle (16) points to the reference point; The right end of the transverse pipe section (14) is rotatably connected to one end of a rotary joint (17), and the other end of the rotary joint (17) passes through the dust cover (8) to be connected to an air intake hose; The nozzle (9) is provided with a toggle portion (18) extending forward or backward from the left end of the transverse pipe section (14); When the knife seat (13) moves downward to drive the toggle portion (18) to rotate downward around the axis of the transverse tube section (14), the jet head (16) rotates upward around the axis of the transverse tube section (14) to avoid the blade (19) and the knife sleeve (20) of the tool (1).

8. The hole processing device for a printed circuit board according to claim 7, characterized in that: The knife cylinder (12) is provided with a conducting member (21) and a limiting member (22); The conductive member (21) comprises: a vertical rod portion (23), and a first horizontal portion (24) extending from the vertical rod portion (23) into the knife cylinder (12); The limiting member (22) is provided with a limiting groove penetrating from top to bottom to accommodate the vertical rod portion (23) of the conductive member (21); the limiting member (22) is fixedly connected to the inner wall of the knife cylinder (12) and cooperates with the inner wall of the knife cylinder (12) to limit the vertical rod portion (23) in the limiting groove; The limiting member (22) is provided with two upper and lower ones, and the first transverse portion (24) is located between the two limiting members (22); When the knife seat (13) moves downward and drives the first transverse portion (24) to move downward, the transmission member (21) drives the shifting portion (18) to rotate downward around the axis of the transverse tube section (14); The conductive member (21) is adapted to be adapted to be driven by an elastic member to reset itself upwards.

9. The hole processing device for a printed circuit board according to claim 8, characterized in that: The conductive member (21) further comprises: a second transverse portion (25); The two ends of the second transverse portion (25) extend from the vertical rod portion (23) along the inner circumference of the knife cylinder (12) in the front-rear direction respectively, so as to cooperate with the inner wall of the knife cylinder (12) to prevent the conductive member (21) from rotating around the vertical rod portion (23); The second transverse portion (25) is arranged between the two limiting members (22), or is arranged above the two limiting members (22); The elastic member is configured as a compression spring (26) and is sleeved on the vertical rod portion (23) of the conductive member (21); The lower one of the two limiting members (22) supports the lower end of the compression spring (26); The upper end of the compression spring (26) supports the first transverse portion (24) or the second transverse portion (25).

10. The hole processing device for a printed circuit board according to any one of claims 5 to 9, characterized in that: The dust shield (8) comprises: a shield body (27), an elastic ring (28) mounted on the bottom of the shield body (27), and a hard ring (29) mounted on the bottom of the elastic ring (28); A first annular dovetail groove (30) is provided at the bottom of the cover body (27), and a first convex ring (31) matching with the first annular dovetail groove (30) is provided at the top of the elastic ring (28); A second annular dovetail groove (32) is provided at the top of the hard ring (29), and a second convex ring (33) matching with the second annular dovetail groove (32) is provided at the bottom of the elastic ring (28).

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