PCB mechanical blind hole processing technology

Abstract

The invention discloses a PCB (Printed Circuit Board) mechanical blind hole processing technology which comprises a tool apron which can be connected with a PCB mechanical blind hole processing power output end; the N arc-shaped blades are arranged on the tool apron in a circumferential array, and the cutting end points of the N arc-shaped blades are located on the same plane and have the same distance from the central axis of the tool apron; the discharging groove is formed in the blade so as to complete the waste guiding action; the discharging promoting mechanism is arranged at the joint of the blade and the tool apron and communicates with the discharging groove so as to complete the action of promoting discharging of the discharging groove, the core is to improve the production efficiency, optimize waste discharging, improve the machining precision and reduce the environmental influence, and an efficient, accurate and environment-friendly advanced manufacturing technology is shown. The beneficial effects not only improve the product quality, but also meet the dual requirements of the modern manufacturing industry on efficiency and environmental protection.

Description

Technical Field

[0001] The invention relates to the technical field of mechanical blind hole processing technology, and in particular to a mechanical blind hole processing technology for a PCB board. Background Art

[0002] In the modern electronics industry, the manufacturing technology of printed circuit boards (PCBs) is one of the core technologies. With the development trend of electronic equipment towards high performance, miniaturization, and multi-functions, the design of PCBs also tends to be high-density and multi-layered, making traditional through-hole technology unable to meet the needs of modern electronic products. Compared with through-holes, blind vias provide better space utilization and electrical performance, and therefore have become a key technology to improve the density of inter-layer connections in PCBs.

[0003] Technical Challenges

[0004] The processing of blind vias involves accurately drilling holes between specific layers of a PCB. These holes do not penetrate the entire board, but reach a specific depth from the surface. This process faces multiple challenges:

[0005] Precisely control drilling depth: Any error in depth may cause circuit connection failure or degraded signal transmission quality.

[0006] Thermal management during drilling: Mechanical drilling generates a lot of heat, which can damage the material properties of the PCB, such as causing separation between layers or material warping.

[0007] Effective removal of chips and waste: During the drilling process, effective waste removal is a key factor in preventing drill bit clogging and improving drilling quality.

[0008] Environmental impact: Traditional coolants and lubricants may have a negative impact on the environment, so the development of environmentally friendly coolants is an important direction to improve the environmental friendliness of PCB processing.

[0009] Limitations of existing technologies

[0010] Although existing technologies can already achieve blind hole processing, common methods such as laser drilling and mechanical drilling still have some limitations. Although laser drilling is accurate, it is expensive and may cause thermal damage to certain materials; mechanical drilling may cause drilling quality and efficiency problems due to improper cutting force and heat management.

[0011] Technology development needs

[0012] Therefore, developing a novel, efficient and environmentally friendly blind hole processing technology that can effectively manage the heat and waste generated by drilling while improving drilling accuracy and surface quality is an important technical demand in the PCB manufacturing field. In addition, the technology should also be able to simplify the operation process and reduce production costs, so as to better meet the needs of the rapid development of electronic products. Summary of the invention

[0013] The purpose of the present invention is to provide a PCB board mechanical blind hole processing technology to solve the problems raised in the above background technology.

[0014] In order to solve the above technical problems, the present invention provides a PCB board mechanical blind hole processing drill bit, comprising:

[0015] The tool holder can be connected to the power output end of the mechanical blind hole processing of the PCB board;

[0016] N arc-shaped blades are arranged on the blade holder in a circular array, and their cutting ends are on the same plane and at the same distance from the center axis of the blade holder;

[0017] A discharge chute is provided on the blade to guide the waste material;

[0018] The material discharging promotion mechanism is arranged at the junction of the blade and the blade seat and is communicated with the material discharging trough to complete the material discharging action of the material discharging trough.

[0019] Preferably, the discharge promoting mechanism comprises:

[0020] The windward plates are arranged in a circular array on the outer peripheral side of the knife seat, and the minimum angle A between the windward plates and the outer peripheral side of the knife seat is in the range of 30°≤A≤60°;

[0021] The connecting bin is arranged on the top surface of the windward plate and is interconnected with the discharge chute;

[0022] The redirection guide plate is arranged at the end of the connecting bin away from the material discharging groove, and is arc-shaped, away from the end of the connecting bin and close to the knife seat.

[0023] Preferably, the interior of the windward plate is a cavity, and a plurality of holes connected to the cavity are arranged on its surface, a plurality of ventilation holes are arranged on the windward plate near the end of the connecting bin, and a shrinking block is arranged in the connecting bin.

[0024] A processing technology for a mechanical blind hole processing drill bit of a PCB board comprises the following steps:

[0025] Step A, preheating: Place the PCB board in the preheating chamber for preheating;

[0026] Step B, clamping and positioning: Fix the PCB board preheated in step A with a non-invasive fixture, and use the visual system and automatic alignment function to ensure the position of the drill bit;

[0027] Step C, drilling operation: setting the drill speed and feed rate, performing blind hole processing on the PCB board clamped in step B, and cooling it with the help of biodegradable coolant, and finally making a semi-finished PCB board;

[0028] Step D: annealing the semi-finished PCB board in step C to produce a finished product.

[0029] Preferably, the preheating temperature in step A is 50° C.-60° C. and lasts for 10-20 minutes.

[0030] Preferably, in step C, the drill speed N ranges from 80RPM to 100RPM, and the feed rate f is calculated as follows:

[0031]

[0032] Wherein F is the feed speed, and the range of F is: 200mm / min-250mm / min.

[0033] Preferably, the method for producing the biodegradable coolant in step C comprises the following steps:

[0034] Step E1, raw materials: raw materials by weight include:

[0035] Microalgae oil, 90-100 parts;

[0036] Nano diamond, 1.5-2 parts;

[0037] Nanosilver, 0.8-1 part;

[0038] Organic soap-based emulsifier, 45-55 parts;

[0039] Step E2, mixing: mixing the microalgae oil, nano-diamonds and nano-silver to prepare a semi-finished product, adding an organic soap-based emulsifier to the semi-finished product to form a biodegradable coolant.

[0040] Preferably, the annealing in step D is performed at a temperature ranging from 100° C. to 150° C. for 5 to 10 minutes.

[0041] Compared with the prior art, the present invention has the following beneficial effects:

[0042] Improve processing efficiency

[0043] The process uses curved blades that are arranged in a circular array on the blade holder, with the cutting ends on the same plane. This design ensures that only the blade head is in direct contact with the PCB board during drilling, thus achieving efficient cutting. In addition, because the space between the blades is fully utilized, when performing multi-layer cutting, there is no need to remove the cut PCB board and the next step of processing can be carried out directly. This greatly improves the overall efficiency and smoothness of the processing process.

[0044] Optimized waste discharge

[0045] The design of the discharge groove and the discharge facilitating mechanism on the blade effectively facilitates the guidance and discharge of waste. In particular, the design of the discharge groove, whose notch is on the inclined surface of the blade and protrudes from the surface of the blade, helps the waste to move along the back of the blade to the discharge groove during the cutting process, and discharges the waste outward by facilitating the rotation of the discharge mechanism. This design not only prevents clogging of the cutting area, but also keeps the working area clean, reducing the frequency and difficulty of cleaning work.

[0046] Precise control and environmentally friendly

[0047] By preheating the PCB board to reduce the brittleness and stress concentration of the material, cracks and interlayer separation during drilling are reduced, thereby improving the accuracy and product quality during processing. At the same time, the use of biodegradable coolant not only effectively manages heat, but also reduces the impact on the environment. The ingredients of this coolant include microalgae oil, nanodiamonds and nanosilver, which not only provide good lubrication and heat dissipation properties, but also have the ability to resist microbial contamination, ensuring the cleanliness and sustainable use of the system.

[0048] Dual optimization of efficiency and environment

[0049] In addition, the entire process also includes an annealing step, which improves the structural integrity of the finished product while reducing material damage. The precise control of annealing temperature and time further ensures product quality and meets high-standard production requirements.

[0050] In summary, the present invention focuses on improving production efficiency, optimizing waste discharge, improving processing accuracy and reducing environmental impact, demonstrating an efficient, precise and environmentally friendly advanced manufacturing technology. These beneficial effects not only improve product quality, but also meet the dual requirements of modern manufacturing for efficiency and environmental protection. BRIEF DESCRIPTION OF THE DRAWINGS

[0051] Figure 1 It is a schematic diagram of the overall structure of an embodiment of the present invention;

[0052] Figure 2 The figure is a schematic diagram of a windward plate and its surface structure according to an embodiment of the present invention.

[0053] In the figure:

[0054] 100, knife holder; 200, blade; 300, discharge chute; 401, windward plate; 402, ventilation hole; 403, connecting bin; 404, shrinking block; 405, redirection guide plate. DETAILED DESCRIPTION

[0055] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the specific embodiments of the present invention are described in detail below with reference to the accompanying drawings.

[0056] Secondly, the present invention is described in detail with reference to schematic diagrams. When describing the embodiments of the present invention in detail, for the sake of convenience, the cross-sectional diagrams showing the device structure will not be partially enlarged according to the general scale, and the schematic diagrams are only examples, which should not limit the scope of protection of the present invention. In addition, in actual production, the three-dimensional dimensions of length, width and depth should be included.

[0057] In order to make the objectives, technical solutions and advantages of the present invention more clear, the embodiments of the present invention will be further described in detail below with reference to the accompanying drawings.

[0058] Figure 1-2 The present invention shows a PCB board mechanical blind hole processing process including:

[0059] The tool holder 100 can be connected to the power output end of the mechanical blind hole processing of the PCB board. N arc-shaped blades 200 are arranged on the tool holder 100 in a circular array, and their cutting ends are on the same plane and have the same distance to the central axis of the tool holder 100. In this way, the blade heads of the blades 200 form a circle. When drilling, only the blade heads of the blades 200 contact and cut the PCB board. In this way, the space between the blades 200 is fully utilized, leaving storage space for the cut PCB board. In this way, when performing multi-layer cutting simultaneously, there is no need to take out the cut PCB board, and it can be cut directly, which greatly improves the overall efficiency.

[0060] The discharge groove 300 is arranged on the blade 200 to guide the waste. The discharge mechanism is arranged at the junction of the blade 200 and the knife seat 100, and is interconnected with the discharge groove 300 to complete the discharge action of the discharge groove 300. The back of the blade 200 is designed to be in a bevel shape, and the notch of the discharge groove 300 is located on the bevel of the blade 200, and its notch protrudes from the surface of the blade 200, so that the cut waste will be guided into the discharge groove 300 under the action of the protrusion when moving along the back of the blade. With the movement of the waste and the rotation of the discharge mechanism, the waste in the discharge groove 300 is discharged outward to avoid clogging the cutting area.

[0061] Preferably, the discharge promoting mechanism comprises:

[0062] The windward plate 401 is arranged in a circular array on the outer peripheral side of the knife holder 100, and the range of the minimum angle A between the windward plate 401 and the outer peripheral side of the knife holder 100 is 30°≤A≤60°. The connecting chamber 403 is arranged on the top surface of the windward plate 401 and is interconnected with the discharge trough 300. The interior of the windward plate 401 is a cavity, and a plurality of holes connected to the cavity are arranged on its surface. The windward plate 401 is provided with a plurality of ventilation holes 402 near the end of the connecting chamber 403;

[0063] Among them, the range of the minimum angle A between the windward plate 401 and the outer peripheral side of the knife seat 100 is 30°≤A≤60°, and the angle determines the initial direction of the airflow entering the windward plate 401. During the design, a specific inlet angle is set to control the speed and direction of the airflow so that it can enter the windward plate 401 more effectively. 60° is conducive to the gathering and acceleration of the airflow, while 30° will diffuse or slow down the airflow. When the windward plate 401 rotates at high speed, the centrifugal force is increased under the action of its angle, so that the airflow obtains sufficient speed and kinetic energy before being blown into the connecting bin 403, thereby more effectively stirring and removing waste.

[0064] The redirection guide plate 405 is arranged at the end of the connection chamber 403 away from the discharge groove 300, and is arc-shaped, away from the end of the connection chamber 403 and close to the knife seat 100, and a shrinking block 404 is arranged in the connection chamber 403;

[0065] Among them, since the redirecting guide plate 405 is arc-shaped and moves away from the end of the connecting bin 403 and close to the knife seat 100, when the knife seat 100 rotates, part of the airflow will move along the direction of the redirecting guide plate 405, thereby generating negative pressure on the redirecting guide plate 405 close to the end of the connecting bin 403, thereby absorbing the waste, and the aperture is reduced by means of the shrinking block 404, thereby increasing the effect of negative pressure extraction, making it easier to extract the waste.

[0066] A processing technology for a mechanical blind hole processing drill bit of a PCB board comprises the following steps:

[0067] Step A, preheating: Place the PCB board in the preheating chamber for preheating. Preheat the PCB material before drilling to reduce the brittleness and stress concentration of the material, which can reduce cracks and interlayer separation during the drilling process.

[0068] Step B, clamping and positioning: Fix the PCB board preheated in step A with a non-invasive fixture, and use the visual system and automatic alignment function to ensure the position of the drill bit.

[0069] Step C, drilling operation: setting the drill speed and feed rate, performing blind hole processing on the PCB board clamped in step B, and cooling it with the help of biodegradable coolant, and finally making a semi-finished PCB board;

[0070] Among them, using biodegradable coolants for cooling can not only effectively manage heat but also reduce the impact on the environment.

[0071] Step D: annealing the semi-finished PCB board in step C to make it into a finished product, which effectively reduces material damage during the processing and improves the structural integrity of the final product.

[0072] Preferably, the preheating temperature in step A is 50° C.-60° C. and lasts for 10-20 minutes.

[0073] Preferably, in step C, the drill speed N ranges from 80RPM to 100RPM, and the feed rate f is calculated as follows:

[0074]

[0075] Wherein F is the feed speed, and the range of F is: 200mm / min-250mm / min.

[0076] The drill bit uses a low-speed rotation method to process blind holes, so that the waste after cutting is relatively complete and in strips, which can be better discharged and reduce the waste from clogging the cutting port and affecting the processing accuracy.

[0077] Preferably, the method for producing the biodegradable coolant in step C comprises the following steps:

[0078] Step E1, raw materials: raw materials by weight include:

[0079] Microalgae oil, 90-100 parts, microalgae oil is an oil extracted from fast-growing microalgae that can be cultivated on a large scale in a controlled environment, providing a sustainable source of oil, rich in polyunsaturated fatty acids, providing good lubricity, high biodegradability, and low environmental impact.

[0080] Nano diamond, 1.5-2 parts, has extremely high hardness and good thermal conductivity, which can help effectively dissipate heat while maintaining lubrication.

[0081] Nanosilver, 0.8-1 part, has antimicrobial properties that prevent the coolant from being contaminated by microorganisms during use and improve the overall cleanliness of the system.

[0082] Organic soap-based emulsifier, 45-55 parts;

[0083] Step E2, mixing: mixing the microalgae oil, nano-diamonds and nano-silver to prepare a semi-finished product, adding an organic soap-based emulsifier to the semi-finished product to form a biodegradable coolant.

[0084] Preferably, the annealing in step D is performed at a temperature ranging from 100° C. to 150° C. for 5 to 10 minutes.

[0085] Beneficial effects:

[0086] Improve processing efficiency

[0087] The process uses curved blades that are arranged in a circular array on the blade holder, with the cutting ends on the same plane. This design ensures that only the blade head is in direct contact with the PCB board during drilling, thus achieving efficient cutting. In addition, because the space between the blades is fully utilized, when performing multi-layer cutting, there is no need to remove the cut PCB board and the next step of processing can be carried out directly. This greatly improves the overall efficiency and smoothness of the processing process.

[0088] Optimized waste discharge

[0089] The design of the discharge groove and the discharge facilitating mechanism on the blade effectively facilitates the guidance and discharge of waste. In particular, the design of the discharge groove, whose notch is on the inclined surface of the blade and protrudes from the surface of the blade, helps the waste to move along the back of the blade to the discharge groove during the cutting process, and discharges the waste outward by facilitating the rotation of the discharge mechanism. This design not only prevents clogging of the cutting area, but also keeps the working area clean, reducing the frequency and difficulty of cleaning work.

[0090] Precise control and environmentally friendly

[0091] By preheating the PCB board to reduce the brittleness and stress concentration of the material, cracks and interlayer separation during drilling are reduced, thereby improving the accuracy and product quality during processing. At the same time, the use of biodegradable coolant not only effectively manages heat, but also reduces the impact on the environment. The ingredients of this coolant include microalgae oil, nanodiamonds and nanosilver, which not only provide good lubrication and heat dissipation properties, but also have the ability to resist microbial contamination, ensuring the cleanliness and sustainable use of the system.

[0092] Dual optimization of efficiency and environment

[0093] In addition, the entire process also includes an annealing step, which improves the structural integrity of the finished product while reducing material damage. The precise control of annealing temperature and time further ensures product quality and meets high-standard production requirements.

[0094] In summary, the present invention focuses on improving production efficiency, optimizing waste discharge, improving processing accuracy and reducing environmental impact, demonstrating an efficient, precise and environmentally friendly advanced manufacturing technology. These beneficial effects not only improve product quality, but also meet the dual requirements of modern manufacturing for efficiency and environmental protection.

[0095] Although the present invention has been described above with reference to the embodiments, various modifications may be made thereto and parts thereof may be replaced by equivalents without departing from the scope of the present invention. In particular, as long as there is no structural conflict, the various features in the embodiments disclosed in the present invention may be used in combination with each other in any manner, and the fact that these combinations are not exhaustively described in this specification is only for the sake of omitting space and saving resources. Therefore, the present invention is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. A drill bit for mechanical blind hole processing of PCB board, characterized by: include, The tool holder (100) can be connected to the power output end of the mechanical blind hole processing of the PCB board; N arc-shaped blades (200) are arranged in a circular array on a blade holder (100), and their cutting ends are on the same plane and have the same distance from the center axis of the blade holder (100); A discharge chute (300) is provided on the blade (200) to guide the waste material; The material discharging promotion mechanism is arranged at the junction of the blade (200) and the blade seat (100), and is communicated with the material discharging groove (300) to complete the material discharging action of the material discharging groove (300).

2. A PCB board mechanical blind hole processing drill according to claim 1, characterized in that: The discharge promoting mechanism comprises: The windward plates (401) are arranged in a circular array on the outer peripheral side of the knife seat (100), and the minimum angle A between the windward plates (401) and the outer peripheral side of the knife seat (100) is in the range of 30°≤A≤60°; A connecting bin (403) is disposed on the top surface of the windward plate (401) and is in communication with the discharge chute (300); The redirection guide plate (405) is arranged at the end of the connecting chamber (403) away from the discharge groove (300), and is arc-shaped, away from the end of the connecting chamber (403) and close to the knife seat (100).

3. A PCB board mechanical blind hole processing drill according to claim 2, characterized in that: The windward plate (401) has a cavity inside and a plurality of holes connected to the cavity are arranged on its surface. The windward plate (401) is provided with a plurality of ventilation holes (402) near the end of the connection chamber (403). A shrinking block (404) is arranged in the connection chamber (403).

4. A processing technology for a mechanical blind hole processing drill bit for a PCB board according to any one of claims 1 to 3, characterized in that: The following steps are involved: Step (A), preheating: placing the PCB board in a preheating chamber for preheating; Step (B), clamping and positioning: the PCB board preheated in step (A) is fixed with a non-invasive fixture, and the position of the drill bit is ensured with the help of a visual system and an automatic alignment function; Step (C), drilling operation: setting the drill speed and feed rate, performing blind hole processing on the PCB board clamped in step (B), and cooling it with the help of a biodegradable coolant, and finally making a semi-finished PCB board; Step (D), annealing the semi-finished PCB board in step (C) to produce a finished product after the annealing is completed.

5. A PCB board mechanical blind hole processing process according to claim 4, characterized in that: The preheating temperature in the step (A) is 50° C.-60° C. and lasts for 10-20 minutes.

6. A PCB board mechanical blind hole processing process according to claim 4, characterized in that: In step (C), the drill speed N ranges from 80RPM to 100RPM, and the feed rate f is calculated as follows: Wherein F is the feed speed, and the range of F is: 200mm / min-250mm / min.

7. A PCB board mechanical blind hole processing process according to claim 6, characterized in that: The method for producing the biodegradable coolant in step (C) comprises the following steps: Step (E1), raw materials: raw materials by weight include: Microalgae oil, 90-100 parts; Nano diamond, 1.5-2 parts; Nanosilver, 0.8-1 part; Organic soap-based emulsifier, 45-55 parts; Step (E2), mixing: mixing the microalgae oil, nanodiamonds and nanosilver to form a semi-finished product, adding an organic soap-based emulsifier to the semi-finished product to form a biodegradable coolant.

8. A PCB board mechanical blind hole processing process according to claim 4, characterized in that: The annealing in step (D) has an annealing temperature range of 100° C.-150° C. and a time range of 5-10 minutes.

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