Forming method for preventing burrs at intersection point of PCB forming fishing groove and NPTH hole

Abstract

The invention relates to the technical field of PCBs (printed circuit boards), in particular to a forming method for preventing burrs at an intersection point of a PCB forming scooping groove and an NPTH (non-penetration through hole), which comprises the following steps of: S1, designing a forming milling belt: aligning the center point of a milling cutter to the edge of the NPTH according to a PCB design drawing, designing a milling belt path from inside to outside, and ensuring that the intersection point of the NPTH groove hole and the periphery is cut off in advance; the step can be accurately designed through CAD / CAM software; s2, forming production is conducted, specifically, a designed milling belt is called for production, a milling cutter of a proper specification is selected for edge milling on a forming machine, first workpiece confirmation needs to be conducted before production, and it is ensured that the quality meets the requirement; and S3, cutter selection and replacement: according to the material, thickness and slotted hole size of the PCB, a proper cutter diameter of a milling cutter is selected, and the wear condition of the cutter is checked regularly, the production efficiency and the product quality are improved, the labor cost and the complaint rate are reduced, and the forming method for preventing burrs at the intersection point of the PCB forming scooping groove and the NPTH hole has relatively high practical value and application prospect.

Description

Technical Field

[0001] The invention relates to the technical field of PCB boards, and in particular to a burr-proof forming method for the intersection of a PCB board forming groove and an NPTH hole. Background Art

[0002] There is no patent in the industry for the anti-burr forming method for the intersection of the PCB board forming groove and the NPTH hole. All factories do not have a suitable method to produce or directly and roughly use manual brushing to remove the burrs after forming before shipping.

[0003] At present, the boards produced by various PCB manufacturers are designed to be parallel to the intersection of the formed groove and the NPTH hole during production. During production, sharp burrs are directly produced, and this defect is not accepted, which will cause the upper part to fail to go in when the upper part is installed.

[0004] At present, PCB manufacturers will manually remove the burrs produced by such designs with a brush after molding. The time and efficiency of rework are often insufficient to meet the production schedule requirements, and rework requires labor costs, resulting in higher PCB manufacturing costs and longer delivery times, causing the market competitiveness of various companies' products to decline.

[0005] The burr brushing process is very likely to cause the board to break, bend, scratch and other problems, which may cause secondary damage to the board and cause complaints.

[0006] It is not easy to clean the burrs by manual brushing, which may cause leakage to the end, resulting in the failure of parts to be inserted into the PCBA end or the parts floating or poor soldering, causing the entire board to be scrapped or the entire machine to be defective or scrapped, increasing customer complaint costs;

[0007] In view of the above problems, a forming method for preventing burrs at the intersection of a PCB board forming groove and a NPTH hole is provided. Summary of the invention

[0008] The purpose of the present invention is to provide a method for preventing burrs at the intersection of a PCB board forming groove and an NPTH hole, so as to solve the problems raised in the above background technology. To achieve the above purpose, the present invention provides the following technical solution: A method for preventing burrs at the intersection of a PCB board forming groove and an NPTH hole, comprising the following steps:

[0009] S1. Design of forming gong belt: According to the PCB design drawing, align the center point of the milling cutter with the edge of the NPTH hole, design the gong belt path from the inside to the outside, and ensure that the intersection of the NPTH slot and the periphery is cut off in advance. This step can be accurately designed through CAD / CAM software;

[0010] S2, molding production: call the designed gong belt for production, and select the milling cutter of appropriate specifications for gong edge on the molding machine. Before production, the first piece confirmation is required to ensure that the quality meets the requirements;

[0011] S3. Tool selection and replacement: Select the appropriate milling cutter diameter according to the material, thickness and slot size of the PCB board, check the tool wear regularly, and replace the severely worn tools in time to ensure production efficiency and product quality;

[0012] S4. Quality monitoring and feedback: During the production process, quality monitoring points are set up to conduct random inspections on the produced PCB boards. Once burrs and other undesirable phenomena are found, production is stopped immediately, the causes are analyzed and process parameters or tool selection are adjusted. A quality feedback mechanism is established and feedback issues are promptly communicated to the production department for continuous improvement.

[0013] Preferably, the specifications of the milling cutter include 1.8mm, 1.4mm, 1.2mm, 1.0mm, and 0.8mm.

[0014] Preferably, the method for designing a forming gong belt also includes:

[0015] S1. Obtain PCB design data and export PCB drilling positions, board frame positions and other relevant design information from CAD software;

[0016] S2. Determine the path of the gong belt. According to the drilling position and frame position of the PCB, use polygon Boolean operation and inclusion operation to calculate the single board area and boundary area to ensure that the path can cover the area to be formed and avoid burrs at the intersection with the NPTH hole;

[0017] S3, analyze gaps and repair, automatically analyze the gong belt path, detect possible gaps, set the maximum analysis gap size and the maximum automatic repair size, and automatically repair the gaps. For gaps that cannot be automatically repaired, especially those at arcs, manual repair is required;

[0018] S4, smoothing, smoothing the belt path and setting offset parameters to reduce vibration and wear of the belt during the forming process.

[0019] Preferably, the maximum gap size is 3 mil.

[0020] Preferably, the maximum automatic repair size is 2 Mil.

[0021] Preferably, the offset parameter is 1 Mil.

[0022] Preferably, the selection and replacement of the tool includes:

[0023] S1. Choose according to the PCB material. Different PCB materials have different requirements for cutting tools.

[0024] S2. Choose according to the size of the slot. The size of the slot directly affects the choice of tool. The larger the slot, the larger the required tool diameter.

[0025] S3. Choose according to production needs, and choose the appropriate tool according to production efficiency and precision requirements;

[0026] S4. Check the wear of the tool regularly. When the tool is worn to a certain extent, it will affect the cutting quality and efficiency and needs to be replaced in time.

[0027] S5. Choose the appropriate time for replacement according to the production plan and tool wear.

[0028] Preferably, the selection and replacement of the tool also includes:

[0029] Establish a tool inventory management system to track the inventory and usage of tools in real time;

[0030] Regularly evaluate tool performance and adjust tool selection and replacement strategies based on the evaluation results.

[0031] Preferably, the tool performance includes cutting quality and durability.

[0032] Compared with the prior art, the present invention has the following beneficial effects:

[0033] By optimizing the molding process and tool selection, burr generation is reduced, rework rate and production cost are reduced, production efficiency is improved, and burr-free production at the intersection of the PCB board molding groove and the NPTH hole is ensured to meet demand, improve product competitiveness, reduce the need for manual brushing of burrs, reduce labor costs, and improve the level of production automation. By improving product quality and production efficiency, complaints and return rates are reduced, and satisfaction is improved. By optimizing the molding process and tool selection, burr-free production at the intersection of the PCB board molding groove and the NPTH hole is achieved. This method not only improves production efficiency and product quality, but also reduces labor costs and complaint rates, and has high practical value and application prospects. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] Figure 1 It is a flow chart of the present invention. DETAILED DESCRIPTION

[0035] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technical personnel in this field without creative work are within the scope of protection of the present invention.

[0036] See also Figure 1 The present invention provides a technical solution: a method for preventing burrs at the intersection of a PCB board forming groove and an NPTH hole, comprising the following steps:

[0037] S1. Design of forming gong belt: According to the PCB design drawing, align the center point of the milling cutter with the edge of the NPTH hole, design the gong belt path from the inside to the outside, and ensure that the intersection of the NPTH slot and the periphery is cut off in advance. This step can be accurately designed through CAD / CAM software. According to the drilling position and the frame position of the PCB, polygon Boolean operation and inclusion operation are used to calculate the single board area and boundary area, set the path of the gong belt, ensure that the path can cover the area to be formed, and avoid burrs at the intersection with the NPTH hole (non-plated through hole). Use professional PCB design software or tools to automatically analyze the gong belt path, detect possible gaps, set the maximum analysis gap size (such as 3mil) and the maximum automatic repair size (such as 2mil), and automatically repair the gap. For gaps that cannot be automatically repaired, especially at the arc, manual repair is required to ensure the continuity of the gong belt path, smooth the gong belt path, set the offset parameter (such as 1mil) to reduce the vibration and wear of the gong belt during the forming process, and select the appropriate milling cutter specifications according to the material, thickness and slot size of the PCB. Common milling cutter specifications include 0.8MM, 1.0MM, 1.2MM, 1.5MM, 1.6MM, 2.0MM, 2.4MM, 2.6MM, etc. Pay special attention that if the inner groove width is a certain value (such as 1.2MM), there is no compensation when the tool is just in the center line; generally, right compensation is used for milling the shape to make the board edge smooth; generally, left compensation is used for milling the inner groove to reduce dust. In the PCB design software, set the tool compensation method (such as None, Right compensation, Left compensation) to ensure that the gong belt path is consistent with the PCB design drawing. Generate the gong belt file based on the optimized gong belt path and tool selection. The gong tape file should contain detailed information such as the coordinates of the gong tape path, tool specifications, compensation methods, etc. The gong tape file should be output in a format that can be read by the CNC equipment. Before output, manual data fine-tuning should be performed to ensure the accuracy of the gong tape file. Before mass production, the first piece confirmation should be carried out to check whether the gong tape path is accurate and whether burrs and other undesirable phenomena occur. If problems are found, the gong tape path or tool selection should be adjusted in time. During the production process, quality monitoring points should be set up to conduct random inspections of the produced PCB boards, record quality data, analyze quality trends, and promptly discover and solve problems. The design of forming gong tape is a complex and delicate process involving multiple steps and technical details. By optimizing the gong tape path, selecting appropriate tool specifications and compensation methods, generating accurate gong tape files, and conducting quality monitoring and feedback, it can be ensured that there are no burrs at the intersection of the PCB board forming trough and the NPTH hole, thereby improving product quality and production efficiency.

[0038] S2, molding production: call the designed gong belt for production, and select the milling cutter of appropriate specifications for gong edge on the molding machine. Before production, the first piece confirmation is required to ensure that the quality meets the requirements;

[0039] S3. Tool selection and replacement: According to the material, thickness and slot size of the PCB board, select the appropriate milling cutter diameter, regularly check the tool wear, and replace the severely worn tools in time to ensure production efficiency and product quality. Different PCB materials have different requirements for tools. For example, glass fiber reinforced materials require harder and more wear-resistant tools to reduce chip formation and burr generation. The size of the slot directly affects the choice of tools. Generally speaking, the larger the slot, the larger the tool diameter required. Common milling cutter specifications are 0.8mm, 1.0mm, 1.2mm, 1.5mm, 1.6mm, 2.0mm, 2.4mm, 2.6mm, etc. Choose the appropriate tool according to the requirements of production efficiency and precision. For example, for PCB boards with high precision requirements, it is necessary to select more precise tools, such as drill bits with a diameter of less than 0.5mm. Selecting durable tools can reduce the frequency of tool replacement and improve production efficiency. Durable tools usually have higher hardness and wear resistance. During the production process, check the wear of the tools regularly. When the tool is worn to a certain extent, it will affect the cutting quality and efficiency, and needs to be replaced in time. Choose the appropriate replacement time according to the production plan and tool wear. Avoid replacing tools during peak production periods to avoid affecting production efficiency. When replacing tools, it is necessary to follow the specifications provided by the equipment manufacturer. Ensure that the tool is installed correctly and firmly to avoid falling off or damage during the cutting process. Each time the tool is replaced, record the tool specifications, replacement time, replacement reasons and other information. This information helps to analyze the service life and wear of the tool, provide a reference for subsequent tool selection, establish a tool inventory management system, and track the inventory and use of the tool in real time. Ensure that there is enough tool supply during the production process to avoid affecting the production progress due to tool shortages, and regularly evaluate the performance of the tool, including cutting quality, durability and other aspects. According to the evaluation results, adjust the tool selection and replacement strategy, establish a stable cooperative relationship with the tool supplier, and ensure that high-quality tools and technical support can be obtained in a timely manner. The selection and replacement of tools is crucial to the PCB manufacturing process. By reasonably selecting tools, regularly checking tool wear, replacing tools according to specifications, and establishing an effective tool management system, you can ensure the steady improvement of product quality and production efficiency;

[0040] S4. Quality monitoring and feedback: During the production process, quality monitoring points are set up to conduct random inspections on the produced PCB boards. Once burrs and other undesirable phenomena are found, production is stopped immediately, the causes are analyzed and process parameters or tool selection is adjusted. A quality feedback mechanism is established to promptly convey the feedback issues to the production department for continuous improvement. Various types of data are collected and analyzed, such as key indicators such as customer satisfaction, product failure rate, and number of service issues. Through data analysis tools and methods such as statistical process control (SPC) and Six Sigma, in-depth mining and analysis of data are carried out to promptly discover and solve potential quality problems to avoid further expansion of problems. A quality-centered management system is established, emphasizing full participation and continuous improvement. Quality goals and indicators are formulated, a quality team is established, and employee training is conducted. The effective operation of the quality management system is ensured through regular audits and evaluations. Raw materials are strictly inspected and screened to ensure that they meet quality standards. Certified reference materials or internal standard samples are used as monitoring samples. Monitoring samples are regularly tested to verify the accuracy of the test results. This is suitable for instrument comparison, personnel comparison, method comparison, etc. within the laboratory. The same sample is tested at different time intervals and the results are compared before and after. The consistency of the measurement results is used to determine whether there are problems in the testing process. It is suitable for monitoring the continuous stability of the test results and observing their development trends. Through regular customer satisfaction surveys, customer visits, etc., customer feedback on products or services is collected, customer feedback is sorted and analyzed, and customer satisfaction and reasons for dissatisfaction with products or services are understood. According to customer feedback, products or services are improved in a timely manner to improve quality and customer satisfaction. An internal quality feedback mechanism is established to encourage employees to raise quality issues and improvement suggestions, verify and investigate quality issues raised by employees, formulate improvement measures and track implementation effects. Through the internal feedback mechanism, the quality management system is continuously improved to improve product quality. Statistics and analysis of defective products in the production process are carried out to find out the causes and laws of defective products, and targeted improvement measures are formulated. Through statistics and analysis of defective products, similar problems are prevented from happening again. Quality reports are regularly prepared, including production quality indicators, product quality assessments and analysis of related issues. Quality reports should reflect the current quality status in detail, accurately and objectively. Through quality reports, management can understand the quality status in a timely manner and take corresponding improvement measures. Quality monitoring and feedback are important links to ensure the quality of products or services. By comprehensively using a variety of quality monitoring methods and feedback mechanisms, companies can promptly identify and resolve quality issues and continuously improve product quality and customer satisfaction.

[0041] In this embodiment, the specifications of the milling cutter include 1.8mm, 1.4mm, 1.2mm, 1.0mm, and 0.8mm.

[0042] In this embodiment, the method for designing the forming gong belt also includes:

[0043] S1. Obtain PCB design data and export PCB drilling positions, board frame positions and other relevant design information from CAD software;

[0044] S2. Determine the path of the gong belt. According to the drilling position and frame position of the PCB, use polygon Boolean operation and inclusion operation to calculate the single board area and boundary area to ensure that the path can cover the area to be formed and avoid burrs at the intersection with the NPTH hole;

[0045] S3, analyze gaps and repair, automatically analyze the gong belt path, detect possible gaps, set the maximum analysis gap size and the maximum automatic repair size, and automatically repair the gaps. For gaps that cannot be automatically repaired, especially those at arcs, manual repair is required;

[0046] S4, smoothing, smoothing the belt path and setting offset parameters to reduce vibration and wear of the belt during the forming process.

[0047] In this embodiment, the maximum gap size is 3 mil.

[0048] In this embodiment, the maximum automatic repair size is 2Mil.

[0049] In this embodiment, the offset parameter is 1 Mil.

[0050] In this embodiment, the selection and replacement of the tool includes:

[0051] S1. Choose according to the PCB material. Different PCB materials have different requirements for cutting tools.

[0052] S2. Choose according to the size of the slot. The size of the slot directly affects the choice of tool. The larger the slot, the larger the required tool diameter.

[0053] S3. Choose according to production needs, and choose the appropriate tool according to production efficiency and precision requirements;

[0054] S4. Check the wear of the tool regularly. When the tool is worn to a certain extent, it will affect the cutting quality and efficiency and needs to be replaced in time.

[0055] S5. Choose the appropriate time for replacement according to the production plan and tool wear.

[0056] In this embodiment, the selection and replacement of the tool also includes:

[0057] Establish a tool inventory management system to track the inventory and usage of tools in real time;

[0058] Regularly evaluate tool performance and adjust tool selection and replacement strategies based on the evaluation results.

[0059] In this embodiment, the tool performance includes cutting quality and durability.

[0060] The above shows and describes the basic principles, main features and advantages of the present invention. Technical personnel in this industry should understand that the present invention is not limited to the above embodiments. The above embodiments and descriptions are only preferred examples of the present invention and are not used to limit the present invention. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, which fall within the scope of the present invention to be protected. The scope of protection of the present invention is defined by the attached claims and their equivalents.

Claims

1. A method for preventing burrs at the intersection of a PCB board forming groove and an NPTH hole, characterized in that: The steps include: S1. Design of forming gong belt: According to the PCB design drawing, align the center point of the milling cutter with the edge of the NPTH hole, design the gong belt path from the inside to the outside, and ensure that the intersection of the NPTH slot and the periphery is cut off in advance. This step can be accurately designed through CAD / CAM software; S2, molding production: call the designed gong belt for production, and select the milling cutter of appropriate specifications for gong edge on the molding machine. Before production, the first piece confirmation is required to ensure that the quality meets the requirements; S3. Tool selection and replacement: Select the appropriate milling cutter diameter according to the material, thickness and slot size of the PCB board, check the tool wear regularly, and replace the severely worn tools in time to ensure production efficiency and product quality; S4. Quality monitoring and feedback: During the production process, quality monitoring points are set up to conduct random inspections on the produced PCB boards. Once burrs and other undesirable phenomena are found, production is stopped immediately, the causes are analyzed and process parameters or tool selection are adjusted. A quality feedback mechanism is established and feedback issues are promptly communicated to the production department for continuous improvement.

2. The method for preventing burrs at the intersection of a PCB board forming groove and a NPTH hole according to claim 1, characterized in that: The specifications of the milling cutter include 1.8mm, 1.4mm, 1.2mm, 1.0mm, and 0.8mm.

3. The method for preventing burrs at the intersection of a PCB board forming groove and a NPTH hole according to claim 1, characterized in that: The method of forming gong belt design also includes: S1. Obtain PCB design data and export PCB drilling positions, board frame positions and other relevant design information from CAD software; S2. Determine the path of the gong belt. According to the drilling position and frame position of the PCB, use polygon Boolean operation and inclusion operation to calculate the single board area and boundary area to ensure that the path can cover the area to be formed and avoid burrs at the intersection with the NPTH hole; S3, analyze gaps and repair, automatically analyze the gong belt path, detect possible gaps, set the maximum analysis gap size and the maximum automatic repair size, and automatically repair the gaps. For gaps that cannot be automatically repaired, especially those at arcs, manual repair is required; S4, smoothing, smoothing the belt path and setting offset parameters to reduce vibration and wear of the belt during the forming process.

4. The method for preventing burrs at the intersection of a PCB board forming groove and a NPTH hole according to claim 3, characterized in that: The maximum notch size is 3 mil.

5. The method for preventing burrs at the intersection of a PCB board forming groove and a NPTH hole according to claim 3, characterized in that: The maximum automatic repair size is 2Mil.

6. The method for preventing burrs at the intersection of a PCB board forming groove and a NPTH hole according to claim 3, characterized in that: The offset parameter is 1 Mil.

7. The method for preventing burrs at the intersection of a PCB board forming groove and a NPTH hole according to claim 1, characterized in that: The selection and replacement of the tool includes: S1. Choose according to the PCB material. Different PCB materials have different requirements for cutting tools. S2. Choose according to the size of the slot. The size of the slot directly affects the choice of tool. The larger the slot, the larger the required tool diameter. S3. Choose according to production needs, and choose the appropriate tool according to production efficiency and precision requirements; S4. Check the wear of the tool regularly. When the tool is worn to a certain extent, it will affect the cutting quality and efficiency and needs to be replaced in time. S5. Choose the appropriate time for replacement according to the production plan and tool wear.

8. The method for preventing burrs at the intersection of a PCB board forming groove and a NPTH hole according to claim 1, characterized in that: The selection and replacement of the tool also includes: Establish a tool inventory management system to track the inventory and usage of tools in real time; Regularly evaluate tool performance and adjust tool selection and replacement strategies based on the evaluation results.

9. A method for preventing burrs at the intersection of a PCB board forming groove and a NPTH hole according to claim 8, characterized in that: The tool performance includes cutting quality and durability.

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