Method for manufacturing high-precision printed wiring board

Abstract

The application discloses a manufacturing method of high-precision printed circuit board, comprising the following steps: S1, cutting; S2, drilling; S3, copper electroplating; S4, circuit image transfer; S5, secondary copper electroplating; S6, circuit etching; S7, solder mask printing; S8, text printing; S9, surface treatment; the manufacturing method of the high-precision printed circuit board further uses a smoking equipment for treating smoke dust generated in the solder mask process, and the smoking equipment comprises a mounting plate. The application is provided with turnover pipes, smoking ports, dust suction pumps, connecting pipes, mounting plates, fixing plates and adjusting threaded rods, smoke adsorption operation can be realized by means of two turnover pipes with multiple smoking ports, connecting rods and dust suction pumps, the adsorption range is wide, the fixing plates can be used to realize stable installation with a workshop mounting platform, and the spacing between the two fixing plates can be adjusted to adapt to the installation of mounting areas of different sizes.

Description

Technical Field

[0001] This invention relates to the field of printed circuit board technology, and more particularly to a method for manufacturing high-precision printed circuit boards. Background Technology

[0002] Printed circuit boards (PCBs) are one of the most important components of electronic products. From small electronic watches to large electronic products that explore the ocean and space, wherever electronic components exist, the electrical interconnections between them require PCBs. As electronic technology has developed, the functions and structures of electronic products have become increasingly complex. Component layout and interconnection wiring can no longer be as haphazard as before, otherwise, inspection would be a nightmare. Therefore, rivets and terminals were nailed onto a board as connection points, and wires were used to connect the components to the contacts. Wiring was done on one side of the board, and components were mounted on the other side. This was the most primitive PCB. The invention of single-sided copper-clad laminate marked a new era in PCB design and manufacturing. First, an anti-corrosion film pattern was printed on the copper-clad laminate using a stencil, and then the lines were etched. This technique was as simple as printing on paper, hence the name "printed circuit board".

[0003] In existing technologies, printed circuit boards generate a large amount of fumes during the solder mask process. If these fumes are inhaled by operators, they can harm their health. Therefore, adsorption devices are often used to absorb these fumes. However, existing adsorption devices have simple structures, often consisting of a pipe extending from the workbench to adsorb the fumes. The workpiece needs to be placed close to the pipe opening to achieve adsorption, resulting in a limited overall adsorption range and poor adsorption efficiency. Summary of the Invention

[0004] The purpose of this invention is to overcome the shortcomings of existing technologies by proposing a manufacturing method for high-precision printed circuit boards. This method uses components such as a flip tube, a smoke inlet, a dust pump, a connecting tube, a mounting plate, a fixing plate, and an adjusting threaded rod to achieve smoke adsorption by using two flip tubes with multiple smoke inlets in conjunction with the connecting rod and the dust pump. The adsorption range is wide, and the fixing plate enables stable installation on the workshop installation platform. Furthermore, the distance between the two fixing plates is adjustable to accommodate installation areas of various sizes.

[0005] To achieve the above objectives, the present invention adopts the following technical solution:

[0006] A method for manufacturing high-precision printed circuit boards includes the following steps:

[0007] S1. Cutting: The base plate is cut and processed using a cutting device to obtain the substrate.

[0008] S2. Drilling: Drill holes in the substrate using drilling tools to obtain a drilled semi-finished product.

[0009] S3, copper plating, the drilled semi-finished product is placed in the plating barrel for chemical electroplating.

[0010] S4. Circuit image transfer: The image on the film is transferred to the substrate using the photosensitivity of the dry film.

[0011] S5. Secondary copper electroplating: The above finished products are placed in an electroplating tank for secondary chemical electroplating.

[0012] S6. Circuit etching, using nitric acid to corrode away the remaining copper foil;

[0013] S7. Solder resist printing: The workpiece is pressed between two columnar electrodes, and then heated by electricity to melt the workpiece at the contact point to form a weld nugget. Then the power is turned off, and the workpiece solidifies and crystallizes under pressure to form a dense solder joint.

[0014] S8. Text printing: The finished product obtained in step S7 is processed by text printing using a screen printing plate.

[0015] S9. Surface treatment, including hot air leveling and organic coating on the finished product obtained in step S8.

[0016] The aforementioned high-precision printed circuit board manufacturing method also utilizes a fumigation device to handle the fumes generated during the solder resist process. The fumigation device includes a mounting plate with two adjusting grooves on its upper surface. Adjusting threaded rods are rotatably mounted in each of the two adjusting grooves. Two fixed plates are slidably mounted on the upper surface of the mounting plate, and both fixed plates are connected to the adjusting threaded rods via an adjusting mechanism. The mounting plate has an internal transmission cavity, and an adjusting motor is mounted on its upper surface. The ends of the two adjusting threaded rods and the end of the adjusting motor's output shaft extend into the transmission cavity. Both adjusting threaded rods are connected to the adjusting motor via a linkage mechanism. The bottom wall of the mounting plate has a groove with two rotating tubes rotatably mounted within it. A reciprocating screw is positioned between the two rotating tubes. A dust pump is fixedly mounted on one outer wall of the mounting plate. The dust pump has two connecting pipes extending into the rotating pipe at its suction end. Both the connecting pipes and the rotating pipe have multiple smoke inlets, and each smoke inlet on the rotating pipe has a filter screen. The outer walls of both rotating pipes have arc-shaped scrapers via a reciprocating mechanism. A rotating motor is fixedly mounted on one side of the outer wall of the mounting plate. The mounting plate has a transmission cavity inside, and the ends of both rotating pipes and the end of the rotating motor's output shaft extend into the transmission cavity. Both rotating pipes are connected to the rotating motor via a rotating mechanism. Two collection hoppers are located below the mounting plate. A connecting plate is fixedly mounted on one side of the outer wall of the mounting plate. The bottom wall of the connecting plate has a movable groove, and a double-threaded rod is rotatably mounted in the movable groove. Two connecting rods are threaded onto the outer wall of the double-threaded rod, and the collection hoppers are connected to the connecting rods via a connecting mechanism.

[0017] Preferably, the adjusting mechanism includes an adjusting nut threaded onto the outer wall of the adjusting thread rod, and the bottom wall of the fixing plate is fixedly connected to the outer wall of the adjusting nut.

[0018] Preferably, the linkage mechanism includes a transmission gear fixedly connected to the end of the output shaft of the adjusting motor, and a linkage gear that meshes perpendicularly with the transmission gear is fixedly provided at the end of the adjusting threaded rod. Both the transmission gear and the linkage gear are bevel gears.

[0019] Preferably, the reciprocating mechanism includes a screw sleeve fitted on the outer wall of the reciprocating screw, and the outer wall of the arc-shaped scraper is fixedly connected to the outer wall of the screw sleeve.

[0020] Preferably, the rotating mechanism includes a drive gear fixedly connected to the output shaft of the flipping motor, and a driven gear meshing with the drive gear is fixedly provided at the end of the flipping tube.

[0021] Preferably, the connecting mechanism includes a connecting rod fixedly connected to the outer wall of the collecting hopper, the connecting rod having a connecting hole corresponding to the connecting rod, and the bottom wall of the connecting rod having a connecting bolt threadedly connected to the connecting rod.

[0022] Preferably, both mounting plates are L-shaped, and both mounting plates are provided with mounting holes for mounting bolts.

[0023] Preferably, a limiting rod parallel to the reciprocating lead screw is fixedly provided in the groove, and the limiting rod slides through the lead screw sleeve.

[0024] The beneficial effects of this invention are:

[0025] 1. By setting up components such as a flip tube, smoke inlet, dust pump, connecting tube, mounting plate, fixing plate and adjusting threaded rod, the two flip tubes with multiple smoke inlets, together with the connecting rod and dust pump, can achieve smoke adsorption operation with a wide adsorption range. It can also be stably installed on the workshop installation platform with the help of the fixing plate. The distance between the two fixing plates is adjustable to adapt to installation areas of various sizes.

[0026] 2. By setting up a reciprocating lead screw, lead screw sleeve, arc scraper, flip motor and rotating mechanism, the flip motor can be used to flip the two flip tubes so that the smoke inlet is aligned with the filter screen and the arc scraper. Then, the reciprocating lead screw and other components drive the arc scraper to move back and forth to clean the filter screen, ensuring that the filter screen mesh is not blocked by impurities.

[0027] 3. By setting up components such as connecting plates, collecting hoppers, double-ended threaded rods, connecting rods and connecting rods, when the arc-shaped scraper cleans the filter screen, the double-ended threaded rods and other components can drive the two collecting hoppers to move closer and be below the flipping tube, so as to collect and process the impurities that are cleaned down, and prevent them from falling onto the processing platform and causing pollution. In addition, the collecting hoppers can be easily disassembled and installed with the connecting rods through the connecting rods and connecting bolts 19. Attached Figure Description

[0028] Figure 1 This is a schematic diagram of the left-side structure of the smoking device;

[0029] Figure 2 A schematic diagram of the right-side structure of a smoking device;

[0030] Figure 3 for Figure 2 A schematic diagram of the structure viewed from below;

[0031] Figure 4 This is a schematic diagram showing the connection between the flip motor and the flip tube;

[0032] Figure 5 This is a schematic diagram of the vertical cross-section of the inverted tube and the connecting tube;

[0033] Figure 6 This is a schematic diagram showing the connection between the adjusting motor and the adjusting threaded rod.

[0034] In the diagram: 1 Mounting plate, 2 Adjusting motor, 3 Adjusting threaded rod, 4 Fixing plate, 5 Fixing hole, 6 Dust pump, 7 Connecting pipe, 8 Collection hopper, 9 Connecting plate, 10 Connecting rod, 11 Connecting rod, 12 Tilting motor, 13 Groove, 14 Tilting pipe, 15 Smoke inlet, 16 Reciprocating screw, 17 Screw sleeve, 18 Arc scraper, 19 Connecting bolt, 20 Movable groove, 21 Double-ended threaded rod, 22 Driving gear, 23 Driven gear, 24 Transmission gear, 25 Linkage gear. Detailed Implementation

[0035] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments.

[0036] A method for manufacturing high-precision printed circuit boards includes the following steps:

[0037] S1. Cutting: The base plate is cut and processed using a cutting device to obtain the substrate.

[0038] S2. Drilling: Drill holes in the substrate using drilling tools to obtain a drilled semi-finished product.

[0039] S3, copper plating, the drilled semi-finished product is placed in the plating barrel for chemical electroplating.

[0040] S4. Circuit image transfer: The image on the film is transferred to the substrate using the photosensitivity of the dry film.

[0041] S5. Secondary copper electroplating: The above finished products are placed in an electroplating tank for secondary chemical electroplating.

[0042] S6. Circuit etching, using nitric acid to corrode away the remaining copper foil;

[0043] S7. Solder resist printing: The workpiece is pressed between two columnar electrodes, and then heated by electricity to melt the workpiece at the contact point to form a weld nugget. Then the power is turned off, and the workpiece solidifies and crystallizes under pressure to form a dense solder joint.

[0044] S8. Text printing: The finished product obtained in step S7 is processed by text printing using a screen printing plate.

[0045] S9. Surface treatment, including hot air leveling and organic coating on the finished product obtained in step S8.

[0046] Reference Figure 1-6 The manufacturing method of the aforementioned high-precision printed circuit board also uses a fumigation device to treat the fumes generated during the solder resist process. The fumigation device includes a mounting plate 1, with two adjustment grooves on the upper surface of the mounting plate 1. An adjustment threaded rod 3 is rotatably installed in each of the two adjustment grooves. Two fixing plates 4 are slidably installed on the upper surface of the mounting plate 1. Both fixing plates 4 are connected to the adjustment threaded rod 3 through an adjustment mechanism. When the adjustment threaded rod 3 rotates, the adjustment nut on its outer wall threaded sleeve can drive the fixing plate 4 to move. The distance between the two fixing plates 4 can be adjusted to accommodate support devices with different installation areas. Both fixing plates 4 are provided with fixing holes 5 for mounting components such as bolts.

[0047] The mounting plate 1 has an internal transmission cavity. An adjustment motor 2 is provided on the upper surface of the mounting plate 1. The ends of two adjustment threaded rods 3 and the output shaft of the adjustment motor 2 both extend into the transmission cavity. The two adjustment threaded rods 3 are connected to the adjustment motor 2 through a linkage mechanism. The linkage mechanism includes a transmission gear 24 fixedly connected to the output shaft of the adjustment motor 2. A linkage gear 25 that meshes perpendicularly with the transmission gear 24 is fixedly provided at the end of the adjustment threaded rod 3. Both the transmission gear 24 and the linkage gear 25 are bevel gears. Starting the adjustment motor 2 can drive the transmission gear 24 to rotate. The rotation of the transmission gear 24 can drive the linkage gear 25 that meshes perpendicularly with it to rotate. The linkage gear 25 can drive the adjustment threaded rods 3 to rotate.

[0048] The bottom wall of the mounting plate 1 has a groove 13, and two rotating tubes 14 are rotatably installed in the groove 13. A reciprocating screw 16 is also installed between the two rotating tubes 14. A dust pump 6 is fixedly installed on one side of the outer wall of the mounting plate 1. The suction end of the dust pump 6 has two connecting tubes 7 extending into the rotating tubes 14. Both the connecting tubes 7 and the rotating tubes 14 have multiple smoke ports 15. Each smoke port 15 on the rotating tubes 14 has a filter screen. The outer wall of both rotating tubes 14 has an arc-shaped scraper 18 installed through a reciprocating mechanism. The reciprocating mechanism includes a screw sleeve 17 sleeved on the outer wall of the reciprocating screw 16. The outer wall of the arc-shaped scraper 18 is fixedly connected to the outer wall of the screw sleeve 17. When the reciprocating screw 16 rotates, the screw sleeve 17 on its outer wall can drive the arc-shaped scraper 18 to move back and forth on the outer wall of the rotating tube 14 to achieve the brushing operation of the filter screen in the smoke port 15.

[0049] A flip motor 12 is fixedly installed on one side of the outer wall of the mounting plate 1. A transmission cavity is provided inside the mounting plate 1. The ends of the two flip tubes 14 and the end of the output shaft of the flip motor 12 extend into the transmission cavity. The two flip tubes 14 are connected to the flip motor 12 through a rotating mechanism. The rotating mechanism includes a drive gear 22 fixedly connected to the output shaft of the flip motor 12. A driven gear 23 that meshes with the drive gear 22 is fixedly installed at the end of the flip tube 14. Starting the flip motor 12 can drive the drive gear 22 to rotate. The drive gear 22 can drive the driven gear 23 that meshes with it to rotate. The driven gear 23 can drive the flip tube 14 to rotate.

[0050] Two collection hoppers 8 are provided below the mounting plate 1. A connecting plate 9 is fixedly provided on the outer wall of one side of the mounting plate 1. A movable groove 20 is provided on the bottom wall of the connecting plate 9. A double-headed threaded rod 21 is rotatably provided in the movable groove 20. Two connecting rods 11 are threaded on the outer wall of the double-headed threaded rod 21. The collection hopper 8 is connected to the connecting rod 11 through a connecting mechanism. The connecting mechanism includes the connecting rod 11 fixedly connected to the outer wall of the collection hopper 8. The connecting rod 10 is provided with a connecting hole corresponding to the connecting rod 11. The bottom wall of the connecting rod 10 is provided with a connecting bolt 19 threadedly connected to the connecting rod 11. When the double-headed threaded rod 21 rotates, the connecting rod 10 threaded on its outer wall can drive the collection hopper 8 to move with the help of the connecting rod 11.

[0051] Both mounting plates 1 are L-shaped, and both mounting plates 1 are provided with mounting holes for mounting bolts. The L-shape facilitates installation, and the mounting holes are reserved for mounting bolts.

[0052] A limiting rod parallel to the reciprocating lead screw 16 is fixedly installed in the groove 13. The limiting rod slides through the lead screw sleeve 17. The limiting rod is used to limit the lead screw sleeve 17 and prevent the lead screw sleeve 17 from rotating with the reciprocating lead screw 16.

[0053] In use, the fixed plate 4 is fixedly connected to the bottom wall of the support device above the operating platform by means of the fixing bolts and the fixing plate 4. The starting adjustment motor 2 drives the transmission gear 24 to rotate, the transmission gear 24 drives the linkage gear 25 that meshes with it perpendicularly to rotate, the linkage gear 25 drives the adjusting threaded rod 3 to rotate, and when the adjusting threaded rod 3 rotates, the adjusting nut on its outer wall thread can drive the fixed plate 4 to move. The distance between the two fixed plates 4 is adjusted to adapt to the installation of support devices with different installation areas. For example, if the effective installation area of ​​the bottom wall of a support device is limited, the two fixed plates 4 need to be brought closer together to adapt to the installation of the support device.

[0054] During the resist welding process, the dust pump 6 needs to be started. The connecting pipe 7 of the suction port of the dust pump 6 is sealed and penetrates through the outer wall of the mounting plate 1 and the outer wall of the flip tube 14 and enters the interior of the flip tube 14. At this time, the dust pump 6 can be started with the help of the connecting pipe 7 and the flip tube 14 to suck the fumes below it from the suction port 15. The exhaust port of the dust pump 6 is connected with the filter device (based on the filter device for filtering resist welding fumes in the existing technology) through the exhaust pipe to send the fumes into it for filtration.

[0055] Starting the flip motor 12 can drive the drive gear 22 to rotate, which in turn drives the driven gear 23 meshing with it to rotate. The driven gear 23 can then drive the flip tube 14 to rotate. First, the flip motor 12 drives the smoke inlet 15 on one of the flip tubes 14 to correspond with the arc-shaped scraper 18. Then, the power device of the reciprocating screw 16 (the power device is a motor, which is shown in the figures and text) is started. When the reciprocating screw 16 rotates, the screw sleeve 17 on its outer wall can drive the arc-shaped scraper 18 to move back and forth on the outer wall of the flip tube 14, thus cleaning the filter screen inside the smoke inlet 15. After the flip tube 14 is cleaned, the flip motor 12 is started again to drive the smoke inlet 15 on the other flip tube 14 to correspond with the arc-shaped scraper 18. The above operation is repeated to clean the filter screen. It is worth noting that the arc-shaped inner side wall of the arc-shaped scraper 18 is equipped with a brush corresponding to the filter screen.

[0056] When cleaning the smoke inlet 15 and filter screen with the arc-shaped scraper 18, it is necessary to move and adjust the collection hopper 8 to move it below the tilting tube 14. The specific steps are as follows: drive the double-headed threaded rod 21 to rotate with the help of a power device (this power device is also a motor, which is not shown in the figure and text, and is a basic existing technology, so it will not be described in detail). When the double-headed threaded rod 21 rotates, the connecting rod 10 with the threaded sleeve on its outer wall can drive the collection hopper 8 to move with the help of the connecting rod 11, so that it is located below the tilting tube 14 to collect the debris that has been swept down. After cleaning, the double-headed threaded rod 21 is reversed to move and reset.

[0057] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A method for manufacturing a high-precision printed circuit board, characterized in that, Includes the following steps: S1. Cutting: The base plate is cut and processed using a cutting device to obtain the substrate. S2. Drilling: Drill holes in the substrate using drilling tools to obtain a drilled semi-finished product. S3, copper plating, the drilled semi-finished product is placed in the plating barrel for chemical electroplating. S4. Circuit image transfer: The image on the film is transferred to the substrate using the photosensitivity of the dry film. S5. Secondary copper electroplating: The above finished products are placed in an electroplating tank for secondary chemical electroplating. S6. Circuit etching, using nitric acid to corrode away the remaining copper foil; S7. Solder resist printing: The workpiece is pressed between two columnar electrodes, and then heated by electricity to melt the workpiece at the contact point to form a weld nugget. Then the power is turned off, and the workpiece solidifies and crystallizes under pressure to form a dense solder joint. S8. Text printing: The finished product obtained in step S7 is processed by text printing using a screen printing plate. S9. Surface treatment: hot air leveling and organic coating are performed on the finished product obtained in step S8. The above-mentioned high-precision printed circuit board manufacturing method also uses a fumigation device to treat the fumes generated during the solder resist process. The fumigation device includes a mounting plate (1), the upper surface of which is provided with two adjustment grooves, and an adjustment threaded rod (3) is rotatably provided in each of the two adjustment grooves. Two fixing plates (4) are slidably provided on the upper surface of the mounting plate (1), and the two fixing plates (4) are connected to the adjustment threaded rod (3) through an adjustment mechanism. The mounting plate (1) has an internal transmission cavity, and an adjustment motor is provided on the upper surface of the mounting plate (1). (2) The ends of the two adjusting threaded rods (3) and the end of the output shaft of the adjusting motor (2) both extend into the transmission cavity. The two adjusting threaded rods (3) are connected to the adjusting motor (2) through a linkage mechanism. The bottom wall of the mounting plate (1) is provided with a groove (13). Two rotating tubes (14) are rotatably provided in the groove (13). A reciprocating screw (16) is also provided between the two rotating tubes (14). A dust pump (6) is fixedly provided on one side of the outer wall of the mounting plate (1). The suction end of the dust pump (6) is branched with two A connecting pipe (7) extends into the flip tube (14). Both the connecting pipe (7) and the flip tube (14) are provided with multiple smoke ports (15). Each smoke port (15) on the flip tube (14) is provided with a filter screen. The outer walls of both flip tubes (14) are provided with arc-shaped scrapers (18) via a reciprocating mechanism. A flip motor (12) is fixedly installed on one side of the outer wall of the mounting plate (1). The mounting plate (1) is provided with a transmission cavity. The ends of both flip tubes (14) and the end of the output shaft of the flip motor (12) are all... Extending into the transmission cavity, both of the flipping tubes (14) are connected to the flipping motor (12) through a rotating mechanism. Two collection hoppers (8) are provided below the mounting plate (1). A connecting plate (9) is fixedly provided on one side of the outer wall of the mounting plate (1). A movable groove (20) is provided on the bottom wall of the connecting plate (9). A double-headed threaded rod (21) is rotatably provided in the movable groove (20). Two connecting rods (11) are threaded on the outer wall of the double-headed threaded rod (21). The collection hopper (8) is connected to the connecting rod (11) through a connecting mechanism.

2. The method for manufacturing a high-precision printed circuit board according to claim 1, characterized in that, The adjustment mechanism includes an adjustment nut that is threaded onto the outer wall of the adjustment thread rod (3), and the bottom wall of the fixing plate (4) is fixedly connected to the outer wall of the adjustment nut.

3. The method for manufacturing a high-precision printed circuit board according to claim 2, characterized in that, The linkage mechanism includes a transmission gear (24) fixedly connected to the end of the output shaft of the adjusting motor (2), and a linkage gear (25) that meshes perpendicularly with the transmission gear (24) is fixedly provided at the end of the adjusting threaded rod (3). Both the transmission gear (24) and the linkage gear (25) are bevel gears.

4. The method for manufacturing a high-precision printed circuit board according to claim 3, characterized in that, The reciprocating mechanism includes a screw sleeve (17) sleeved on the outer wall of the reciprocating screw (16), and the outer wall of the arc-shaped scraper (18) is fixedly connected to the outer wall of the screw sleeve (17).

5. The method for manufacturing a high-precision printed circuit board according to claim 4, characterized in that, The rotating mechanism includes a drive gear (22) fixedly connected to the output shaft of the flipping motor (12), and a driven gear (23) meshing with the drive gear (22) is fixedly provided at the end of the flipping tube (14).

6. The method for manufacturing a high-precision printed circuit board according to claim 5, characterized in that, The connecting mechanism includes a connecting rod (11) that is fixedly connected to the outer wall of the collection hopper (8). The connecting rod (10) is provided with a connecting hole corresponding to the connecting rod (11), and the bottom wall of the connecting rod (10) is provided with a connecting bolt (19) that is threadedly connected to the connecting rod (11).

7. The method for manufacturing a high-precision printed circuit board according to claim 6, characterized in that, Both mounting plates (1) are L-shaped, and both mounting plates (1) are provided with mounting holes for mounting bolts.

8. The method for manufacturing a high-precision printed circuit board according to claim 7, characterized in that, A limiting rod parallel to the reciprocating lead screw (16) is fixedly provided in the groove (13), and the limiting rod slides through the lead screw sleeve (17).

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