PCB screen printing ink layer thickness uniformity control method, system, equipment and medium

Abstract

This application relates to the technical field of silk screen printing, and more particularly to methods, systems, equipment, and media for controlling the thickness uniformity of PCB silk screen ink layers. This application first collects actual ink layer thickness data and screen tension data for the PCB silk screen printing area, then analyzes the correlation between the two to obtain ink layer uniformity analysis results. Furthermore, appropriate compensation parameters are determined through process compensation analysis. Finally, the silk screen pressure, scraper angle, and printing speed are dynamically adjusted, and screen tension is incorporated into the control system. This achieves precise control of ink layer thickness, demonstrating greater adaptability and reliability than existing technologies and improving product yield.

Description

Technical Field

[0001] The present application relates to the technical field of silk screen printing, and in particular to a method, system, equipment and medium for controlling the thickness uniformity of a silk screen ink layer on a PCB. Background Art

[0002] As electronic products move toward miniaturization and higher density, PCB screen printing plays an increasingly important role in electronics manufacturing. The quality of the screen printing process directly impacts the performance and reliability of the PCB. Ink layer thickness uniformity is a key indicator of screen printing quality, significantly impacting subsequent soldering and protective performance.

[0003] Currently, PCB screen printing is primarily performed using automated screen printing equipment. The thickness of the ink layer is controlled by setting process parameters such as screen pressure, squeegee angle, and printing speed. The screen printing equipment executes printing according to preset process parameters, and the print quality is monitored online using an optical inspection system.

[0004] However, the existing technology only relies on preset fixed process parameters for control and cannot dynamically compensate for the impact of screen tension changes on ink layer uniformity. As a result, uneven ink layer thickness often occurs in actual production, affecting product yield. This situation needs further improvement. Summary of the Invention

[0005] To address the problem that conventional PCB screen printing cannot ensure uniform ink thickness across the entire screen printing area, thus affecting product yield, this application provides a PCB screen printing ink thickness uniformity control method, system, device, and medium, employing the following technical solutions:

[0006] In a first aspect, the present application provides a method for controlling the thickness uniformity of a PCB screen printing ink layer, comprising the following steps:

[0007] Collect the actual thickness data of the ink layer and the screen tension data of the PCB screen printing area;

[0008] Analyze the screen printing quality according to the actual ink layer thickness data and the screen tension data to obtain an ink layer uniformity analysis result;

[0009] Performing process compensation analysis based on the ink layer uniformity analysis results to obtain corresponding process compensation parameters;

[0010] The screen printing pressure, scraper angle and printing speed are adjusted according to the process compensation parameters, and the adjusted parameters are sent to the screen printing equipment for execution.

[0011] By adopting the above technical solution, existing PCB screen printing usually adopts fixed process parameters for control, or relies solely on manual experience to adjust parameters, which cannot respond to changes in screen tension in a timely manner, and it is difficult to establish an accurate compensation mechanism; this application first collects the actual ink layer thickness data and screen tension data of the PCB screen printing area, and then analyzes the correlation between the two to obtain the ink layer uniformity analysis results, and then determines the appropriate compensation parameters through process compensation analysis. Finally, the screen printing pressure, scraper angle and printing speed are dynamically adjusted, and the screen tension is incorporated into the control system to achieve precise control of the ink layer thickness. Compared with the existing technology, it has stronger adaptability and reliability, and can improve product yield.

[0012] Optionally, analyzing the screen printing quality according to the actual ink layer thickness data and the screen tension data to obtain an ink layer uniformity analysis result specifically includes the following steps:

[0013] Obtain the actual thickness data of the ink layer at multiple measurement points in the PCB silk screen area;

[0014] Compare the actual ink layer thickness data of each measuring point with the preset standard ink layer thickness, and calculate the ink layer thickness deviation value of each point;

[0015] Obtain the screen tension data of the corresponding measurement point and analyze the corresponding relationship between the screen tension and the ink layer thickness deviation value;

[0016] The influence degree of the screen tension on the ink layer uniformity is determined according to the corresponding relationship, and an ink layer uniformity analysis result is generated.

[0017] By adopting the above technical solution, it is often found in actual production that the ink layer thickness in the edge area of ​​PCB is significantly thinner than that in the center area. However, since it is impossible to establish a mapping relationship between the ink layer thickness at a specific measurement point and the screen tension at the corresponding position, it is difficult to take effective compensation measures. The present application first obtains the actual ink layer thickness data of each measurement point, and compares it with the preset standard thickness to obtain a deviation value; then obtains the screen tension data at the corresponding positions of these measurement points, establishes a corresponding relationship between the two sets of data, and analyzes how the changing trend of the screen tension affects the distribution of the ink layer thickness; finally, based on this corresponding relationship, the degree of influence of the screen tension on the uniformity of the ink layer is quantitatively evaluated, thereby achieving a quantitative characterization of the influence of the screen tension on the uniformity of the ink layer.

[0018] Optionally, a process compensation analysis is performed based on the ink layer uniformity analysis result to obtain corresponding process compensation parameters, which specifically includes the following steps:

[0019] Performing statistical analysis on the ink layer thickness deviation in the ink layer uniformity analysis result to obtain the overall deviation characteristics of the PCB screen printing area;

[0020] Based on the overall deviation characteristics, calculating the comprehensive influence coefficient of screen tension distribution on ink layer uniformity;

[0021] The overall compensation level of the process parameters is determined according to the comprehensive influence coefficient, and the corresponding process compensation parameters are generated.

[0022] By adopting the above technical solution, this application first performs statistical analysis on the ink layer thickness deviation data to extract deviation indicators that can characterize the characteristics of the entire PCB silk screen area; then, based on these overall deviation characteristics, the comprehensive influence coefficient of the screen tension distribution is introduced, and according to the quantified results of the comprehensive influence coefficient, a graded compensation mechanism for process parameters is established; finally, corresponding specific compensation parameters are generated for different compensation levels, thereby realizing systematic compensation for the influence of screen tension.

[0023] Optionally, determining the overall compensation level of the process parameters according to the comprehensive influence coefficient and generating corresponding process compensation parameters specifically includes the following steps:

[0024] According to the size of the comprehensive influence coefficient, the process parameter compensation is divided into primary compensation, secondary compensation and tertiary compensation;

[0025] When the process parameter compensation is level one, adjust the overall screen printing pressure compensation value;

[0026] When the process parameter compensation is level 2 compensation, adjust the overall screen printing pressure compensation value and the overall scraper angle compensation value;

[0027] When the process parameter compensation is level three, adjust the overall screen printing pressure compensation value, the overall scraper angle compensation value, and the overall printing speed compensation value.

[0028] By adopting the above technical solution, in actual production, when the ink layer is slightly uneven, if the three parameters of pressure, angle and speed are adjusted at the same time, it will cause system oscillation, resulting in further deterioration of the uniformity of the ink layer; this application first divides the process parameter compensation into three levels according to the value of the comprehensive influence coefficient; when the impact is relatively light, only the most critical parameter, the screen printing pressure, is adjusted; when the degree of impact increases, the adjustment of the scraper angle is increased; when a serious impact occurs, the three parameters of pressure, angle and speed are adjusted comprehensively, realizing progressive compensation according to the degree of deviation of the ink layer uniformity, avoiding the blindness of parameter adjustment, not only improving the stability of the system, but also being able to adopt better compensation strategies for different degrees of uniformity problems, thereby improving the compensation effect.

[0029] Optionally, the method further comprises the following steps:

[0030] Detect the viscosity and temperature of screen printing ink;

[0031] comparing the viscosity value with a preset viscosity value range, and issuing an ink adjustment instruction to the screen printing device when the viscosity value exceeds the preset viscosity value range;

[0032] The temperature value is compared with a preset temperature value range, and when the temperature value exceeds the preset temperature value range, the temperature control system is triggered to adjust.

[0033] By adopting the above technical solution, during the production process, the viscosity of the ink gradually increases after long-term use, or the ink temperature fluctuates due to changes in ambient temperature. It is often necessary to wait until printing defects are discovered before making adjustments, resulting in an increase in product defective rates. The present application first detects the viscosity and temperature values ​​of the ink in real time; then compares the detected parameters with the preset standard range in real time; when the viscosity exceeds the range, the ink adjustment mechanism is automatically triggered for adjustment; when the temperature is abnormal, the temperature control system is immediately started for correction. Through real-time monitoring and a rapid response mechanism, it is ensured that the ink always maintains the best working condition, thereby improving production efficiency.

[0034] Optionally, the method further comprises the following steps:

[0035] Detect the number of times the screen is used and the surface condition parameters of the screen;

[0036] Inputting the number of uses and the screen surface state parameters into a preset screen state evaluation model;

[0037] Determine whether the screen needs to be replaced based on the output of the screen status assessment model:

[0038] If so, a screen replacement prompt is issued to the operator.

[0039] By adopting the above technical solution, quality problems such as local blockage and mesh deformation often occur in production before the screen has been used for a certain number of times, or the screen has been used for a certain number of times but the actual condition of the screen is still good. This application first records the number of times the screen has been used in real time and detects various status parameters of the screen surface; then inputs these data into a pre-established screen status evaluation model for analysis; finally, based on the evaluation results of the model, the operator is promptly reminded to replace the screen when it is about to reach the end of its life, thereby avoiding premature scrapping and overuse of the screen, and being able to more accurately predict the optimal time to replace the screen, which significantly improves the scientificity and economy of screen management.

[0040] In a second aspect, the present application provides a PCB screen printing ink layer thickness uniformity control system, comprising:

[0041] Data acquisition module, used to collect the actual thickness data of the ink layer and the screen tension data of the PCB screen printing area;

[0042] a uniformity analysis module, configured to analyze the silk screen printing quality according to the actual ink layer thickness data and the screen tension data, and obtain an ink layer uniformity analysis result;

[0043] A process compensation analysis module, configured to perform process compensation analysis based on the ink layer uniformity analysis result to obtain corresponding process compensation parameters;

[0044] The parameter adjustment module is used to adjust the screen printing pressure, scraper angle and printing speed according to the process compensation parameters, and send the adjusted parameters to the screen printing equipment for execution.

[0045] In a third aspect, the present application provides an electronic device comprising a memory, a processor, and a computer program stored in the memory and runnable on the processor, wherein the processor implements the steps of the above-mentioned PCB screen printing ink layer thickness uniformity control method when executing the computer program.

[0046] In a fourth aspect, the present application provides a computer-readable storage medium having a computer program stored thereon, which, when executed by a processor, implements the steps of the above-mentioned method for controlling the thickness uniformity of the PCB screen printing ink layer.

[0047] In summary, this application includes at least one of the following beneficial technical effects:

[0048] 1. This application first collects the actual ink layer thickness data and screen tension data of the PCB screen printing area, then analyzes the correlation between the two to obtain the ink layer uniformity analysis results. Then, through process compensation analysis, appropriate compensation parameters are determined. Finally, the screen printing pressure, squeegee angle, and printing speed are dynamically adjusted, and the screen tension is incorporated into the control system to achieve precise control of the ink layer thickness. Compared with existing technologies, this technology has greater adaptability and reliability, and can improve product yield.

[0049] 2. In actual production, it is often found that the ink layer thickness at the edge of a PCB is significantly thinner than that in the center. However, due to the inability to establish a mapping relationship between the ink layer thickness at a specific measurement point and the screen tension at the corresponding position, it is difficult to take effective compensation measures. This application first obtains the actual ink layer thickness data at each measurement point and compares it with a preset standard thickness to obtain a deviation value. Then, the screen tension data at the corresponding positions of these measurement points is obtained, and a corresponding relationship between the two sets of data is established to analyze how the changing trend of screen tension affects the distribution of ink layer thickness. Finally, based on this corresponding relationship, the degree of influence of screen tension on ink layer uniformity is quantitatively evaluated, achieving a quantitative characterization of the influence of screen tension on ink layer uniformity.

[0050] 3. In actual production, when the ink layer is slightly uneven, if the three parameters of pressure, angle and speed are adjusted at the same time, it will cause system oscillation, resulting in further deterioration of the uniformity of the ink layer; this application first divides the process parameter compensation into three levels according to the value of the comprehensive influence coefficient; when the impact is relatively light, only the most critical parameter of screen printing pressure is adjusted; when the degree of impact increases, the adjustment of the scraper angle is increased; when a serious impact occurs, the three parameters of pressure, angle and speed are adjusted comprehensively, realizing progressive compensation according to the degree of deviation of the ink layer uniformity, avoiding the blindness of parameter adjustment, not only improving the stability of the system, but also being able to adopt better compensation strategies for different degrees of uniformity problems, thereby improving the compensation effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0051] Figure 1 This is a flow chart of a method for controlling the thickness uniformity of a PCB screen printing ink layer according to an embodiment of the present application;

[0052] Figure 2 This is a flow chart of step S120 in a method for controlling the thickness uniformity of a PCB screen printing ink layer according to an embodiment of the present application;

[0053] Figure 3 This is a flow chart of step S130 in a method for controlling the thickness uniformity of a PCB screen printing ink layer according to an embodiment of the present application;

[0054] Figure 4 This is a flow chart of step S133 in a method for controlling the thickness uniformity of a PCB screen printing ink layer according to an embodiment of the present application;

[0055] Figure 5 This is a schematic diagram of a process for adjusting ink and temperature in a method for controlling the thickness uniformity of a PCB screen printing ink layer according to an embodiment of the present application;

[0056] Figure 6 This is a schematic diagram of the process of detecting the screen in a method for controlling the thickness uniformity of a PCB screen printing ink layer according to an embodiment of the present application;

[0057] Figure 7 This is a module schematic diagram of a PCB silk screen ink layer thickness uniformity control system according to an embodiment of the present application;

[0058] Figure 8 This is a diagram of the internal structure of an electronic device according to an embodiment of the present application. DETAILED DESCRIPTION

[0059] The terms used in the following examples of the present application are only for the purpose of describing specific embodiments and are not intended to limit the present application. As used in the specification and appended claims of this application, the singular expressions "a," "an," "said," "above," "the," and "this" are intended to include plural expressions as well, unless the context clearly indicates otherwise. It should also be understood that the term "and / or" used in this application refers to any or all possible combinations comprising one or more of the listed items.

[0060] In the following, the terms "first" and "second" are used for descriptive purposes only and should not be understood to imply or suggest relative importance or implicitly indicate the number of the technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the embodiments of this application, unless otherwise specified, "plurality" means two or more.

[0061] The embodiments of the present application are described in further detail below with reference to the accompanying drawings.

[0062] In the first aspect, the present application provides a method for controlling the thickness uniformity of a PCB screen printing ink layer, referring to Figure 1 , including the following steps:

[0063] S110, collecting actual ink layer thickness data and screen tension data of the PCB screen printing area.

[0064] In this embodiment, the actual ink layer thickness data refers to the actual ink layer thickness value obtained by detecting the printed area through a thickness measuring device after the PCB screen printing is completed. The measuring device can be a laser thickness gauge or an X-ray thickness gauge, and the measurement accuracy is preferably ±1μm. The screen tension data refers to the screen surface tension value measured by a tension tester, and the unit is N / cm. During the measurement, multiple feature points of the screen should be selected for detection to obtain the tension distribution of the entire screen.

[0065] Specifically, an automatic thickness measurement system and a tension detection system are installed on the PCB screen printing production line to perform real-time testing at multiple preset measurement points on each PCB. For example, on a 300mm x 400mm PCB, 25 evenly distributed measurement points are selected to collect ink layer thickness data. Tension sensors are also placed at corresponding locations on the screen to collect screen tension data in real time. The measured data is transmitted to the control system via a data acquisition module and serves as the basis for subsequent analysis.

[0066] S120 , analyzing the screen printing quality according to the actual ink layer thickness data and the screen tension data to obtain an ink layer uniformity analysis result.

[0067] In this embodiment, by establishing an ink layer thickness distribution map and a screen tension distribution map, the correlation between the two is analyzed to evaluate the overall uniformity of the ink layer.

[0068] Specifically, data processing software is used to statistically analyze the collected data, calculating the mean, standard deviation, and coefficient of variation of the ink layer thickness. For example, when the standard ink layer thickness is set at 30μm, the system monitors the actual thickness at each measurement point in real time and calculates the deviation from the standard value. The system also analyzes screen tension data. The normal tension range is 20-25N / cm. When local tension anomalies occur, the system marks the corresponding area and correlates it with the ink layer thickness deviation.

[0069] S130 . Perform process compensation analysis based on the ink layer uniformity analysis results to obtain corresponding process compensation parameters.

[0070] In this embodiment, the system automatically generates a corresponding process compensation solution based on the ink layer uniformity analysis results.

[0071] Specifically, when the system detects an abnormality in ink layer uniformity, it first determines the degree and distribution of the deviation, then calculates the appropriate process parameter adjustments based on built-in compensation rules. For example, if the ink layer is detected to be thin at the edge, the system will calculate the required increase in screen printing pressure based on the degree of deviation. The calculation of compensation parameters must take into account the adjustment range of process parameters to ensure that the adjusted parameters remain within the acceptable range of the equipment.

[0072] S140 , adjusting the screen printing pressure, scraper angle, and printing speed according to the process compensation parameters, and sending the adjusted parameters to the screen printing device for execution.

[0073] In this embodiment, the calculated process compensation parameters are sent to the control system of the screen printing equipment through the communication interface to achieve automatic adjustment of the process parameters.

[0074] Specifically, when the device receives the compensation command, it first performs a self-check on each actuator to confirm that parameter adjustment is possible. It then sequentially adjusts the screen printing pressure, squeegee angle, and printing speed to the specified values. Once the parameter adjustment is complete, the system confirms the adjustment results and returns the execution status information.

[0075] In one embodiment, referring to Figure 2 In step S120, the screen printing quality is analyzed according to the actual ink layer thickness data and the screen tension data to obtain the ink layer uniformity analysis result, which specifically includes the following steps:

[0076] S121. Acquire actual ink layer thickness data at multiple measurement points in the PCB silk screen area.

[0077] High-precision thickness measurement equipment is used to set up multiple measurement points within the screen printing area of ​​the PCB. These measurement points must be distributed across key areas of the PCB, including the edge, center, and special functional areas. The number and density of measurement points are determined based on the size and complexity of the PCB.

[0078] Specifically, an automatic alignment system ensures consistent measurement position during each measurement. Three data points are collected at each measurement point and averaged to eliminate the influence of random errors. The measurement data is transmitted in real time to the analysis system via a data acquisition card, where the coordinates of each measurement point and the corresponding thickness value are stored in an array.

[0079] S122 , comparing the actual ink layer thickness data of each measuring point with a preset standard ink layer thickness, and calculating the ink layer thickness deviation value of each point.

[0080] Step S122 compares the collected actual thickness data with a preset standard ink layer thickness. The standard ink layer thickness is a target value pre-set according to PCB process requirements. The system calculates the difference between the actual thickness and the standard thickness at each measurement point to generate an ink layer thickness deviation distribution map.

[0081] Specifically, the system generates a heat map of the deviation values ​​of all measurement points to intuitively display the distribution of ink layer thickness, where red represents thicker areas and blue represents thinner areas.

[0082] S123 , obtaining screen tension data of corresponding measurement points, and analyzing the corresponding relationship between the screen tension and the ink layer thickness deviation value.

[0083] The system collects real-time tension data from each monitoring point on the screen through tension sensors and spatially correlates this data with the ink layer thickness deviation data. The system then creates a screen tension distribution map and analyzes the tension value trends and spatial distribution characteristics.

[0084] Specifically, multiple tension sensors are installed on the screen, with their placement corresponding to thickness measurement points on the PCB. For example, if the screen tension in a certain area is detected to be 18N / cm, which is below the standard range (20-25N / cm), the system will record the tension anomaly at that location and correlate it with the ink layer thickness deviation at the corresponding location, establishing a mapping relationship between tension anomaly and ink layer unevenness.

[0085] S124. Determine the degree of influence of the screen tension on the ink layer uniformity based on the corresponding relationship, and generate an ink layer uniformity analysis result.

[0086] In this embodiment, step S124 analyzes the impact of screen tension on ink layer uniformity based on the established correspondence. The system quantifies the impact of screen tension on ink layer uniformity by calculating the correlation coefficient between tension change and thickness deviation. The resulting ink layer uniformity analysis results include information such as thickness deviation values ​​for each region, the distribution of tension-abnormal regions, and the correlation between tension and thickness deviation.

[0087] In one embodiment, referring to Figure 3 In step S130, process compensation analysis is performed based on the ink layer uniformity analysis results to obtain corresponding process compensation parameters, which specifically includes the following steps:

[0088] S131. Perform statistical analysis on the ink layer thickness deviation in the ink layer uniformity analysis results to obtain the overall deviation characteristics of the PCB silk screen area.

[0089] In this embodiment, a statistical analysis method is used to process the ink layer thickness deviation data, and key statistical indicators including the average deviation value, standard deviation, maximum deviation and minimum deviation are calculated.

[0090] S132. Based on the overall deviation characteristics, calculate the comprehensive influence coefficient of the screen tension distribution on the ink layer uniformity.

[0091] Among them, based on the overall deviation characteristics of the ink layer and combined with the screen tension distribution data, a mathematical model is established to calculate the comprehensive influence coefficient.

[0092] Specifically, the system uses a weighted calculation method, assigning different weights to tension anomalies in different areas. For example, if tension reduction in the edge area results in a thicker ink layer, its impact weight is set to 0.6; if tension anomalies in the center area result in a deviated ink layer, its impact weight is set to 0.4. By combining these weighting factors, a comprehensive impact coefficient ranging from 0 to 1 is ultimately calculated, with 0 indicating a minor impact and 1 indicating a severe impact.

[0093] S133. Determine the overall compensation level of the process parameters according to the comprehensive influence coefficient and generate corresponding process compensation parameters.

[0094] In step S133, the compensation of process parameters is divided into multiple levels according to the calculated comprehensive influence coefficient. The system pre-sets the parameter adjustment range corresponding to different compensation levels, and selects the corresponding compensation level according to the size of the comprehensive influence coefficient to determine the specific process compensation parameters.

[0095] In one embodiment, referring to Figure 4 In step S133, the overall compensation level of the process parameters is determined according to the comprehensive influence coefficient, and the corresponding process compensation parameters are generated, which specifically includes the following steps:

[0096] S1331. According to the size of the comprehensive influence coefficient, the process parameter compensation is divided into primary compensation, secondary compensation and tertiary compensation.

[0097] In this embodiment, the comprehensive influence coefficient is an important basis for measuring the compensation level of process parameters. The system divides the compensation level into three levels according to the numerical range of the coefficient: the comprehensive influence coefficient in the range of 0-0.3 is determined as the first-level compensation, the range of 0.3-0.6 is determined as the second-level compensation, and the range of 0.6-1.0 is determined as the third-level compensation.

[0098] Specifically, when determining the compensation level, the system not only considers the value of the comprehensive impact coefficient, but also verifies it based on historical compensation data. For example, if the comprehensive impact coefficient of a certain test is 0.25, the system will query the recent compensation effect data under the same working conditions. If the historical data shows that the first-level compensation can effectively improve the uniformity of the ink layer, the first-level compensation plan will be confirmed and implemented.

[0099] S1332. When the process parameter compensation is level one, adjust the overall screen printing pressure compensation value.

[0100] For Level 1 compensation, the primary focus is adjusting the overall screen printing pressure. The system calculates the required pressure compensation based on the direction and magnitude of the overall ink layer deviation. The pressure compensation adjustment range is typically limited to ±10% of the original set value to ensure safe adjustment.

[0101] Specifically, when the system performs level 1 compensation, if it detects that the overall ink layer is 0.5μm thinner, it calculates that the screen printing pressure needs to be increased by 0.05MPa; if it detects that the overall ink layer is 0.8μm thicker, it calculates that the screen printing pressure needs to be reduced by 0.08MPa. The system monitors the effect of the pressure adjustment in real time to ensure that the compensated ink layer thickness is uniform.

[0102] S1333. When the process parameter compensation is level 2 compensation, adjust the overall screen printing pressure compensation value and the overall scraper angle compensation value.

[0103] The secondary compensation not only adjusts the screen printing pressure but also adds compensation for the scraper angle. The system calculates the compensation values ​​for both pressure and angle based on the uneven distribution of ink layer thickness.

[0104] Specifically, in secondary compensation, if the overall deviation of the ink layer thickness exceeds ±1.2μm, the system will simultaneously adjust the screen printing pressure and the scraper angle. For example, if the pressure is increased by 0.12MPa, the scraper angle is adjusted from 70 degrees to 73 degrees. The coordinated adjustment of these two parameters can more effectively improve the uniformity of the ink layer.

[0105] S1334: When the process parameter compensation is level three compensation, adjust the overall screen printing pressure compensation value, the overall scraper angle compensation value, and the overall printing speed compensation value.

[0106] Three-level compensation is the most comprehensive solution, adjusting three key process parameters simultaneously. Based on the specific values ​​of the comprehensive influencing coefficients, the system calculates the optimal compensation combination for the three parameters, ensuring that the adjustment of each parameter is within the allowable range of the equipment.

[0107] Specifically, when implementing three-level compensation, for example, if the combined impact coefficient is 0.8, the system generates the following compensation plan: increase screen printing pressure by 0.15 MPa, adjust the squeegee angle from 70 degrees to 75 degrees, and reduce the printing speed from 60 mm / s to 50 mm / s. The system monitors the effects of these three parameter adjustments in real time and makes fine adjustments as necessary to achieve the optimal compensation effect.

[0108] In one embodiment, referring to Figure 5 , the method further comprises the steps of:

[0109] S510: Detect the viscosity and temperature of the screen printing ink.

[0110] In this example, an automated detection system monitors the key physical parameters of screen printing ink in real time. Equipped with a high-precision viscometer and temperature sensor, the system continuously collects viscosity and temperature data. The sampling frequency can be adjusted based on production cycles, ensuring timely detection of any abnormal changes in the ink's state.

[0111] S520: Compare the viscosity value with a preset viscosity value range. When the viscosity value exceeds the preset viscosity value range, send an ink adjustment instruction to the screen printing device.

[0112] In this embodiment, a standard operating range for ink viscosity is pre-set. The system compares the real-time viscosity value detected with the preset range in real time. If the viscosity value is detected to be outside the range, the control system automatically calculates the required adjustment amount and sends the corresponding adjustment instruction to the automatic ink addition system.

[0113] Specifically, assuming the ink's standard viscosity range is set at 15,000-20,000 mPa·s, if the ink viscosity reaches 21,000 mPa·s, the system determines that the viscosity is too high and automatically calculates the amount of diluent to be added. For example, if the calculation requires adding 50 ml of diluent, the system will control the diluent pump to accurately add it and re-check the viscosity value after addition to ensure that the adjustment effect meets the requirements.

[0114] S530: Compare the temperature value with a preset temperature range. When the temperature value exceeds the preset temperature range, trigger the temperature control system to adjust the temperature.

[0115] Among them, the system presets the optimal operating temperature range of the ink. When a temperature abnormality is detected, the temperature control system will be automatically started to adjust the ink temperature to the appropriate range through heating or cooling devices.

[0116] Specifically, the standard temperature range of the ink is set at 22-26°C. When the ink temperature is detected to rise to 28°C, the system automatically starts the cooling device. The cooling system uses water cooling to control the cooling water flow and temperature to achieve precise cooling of the ink. For example, when the temperature needs to be reduced from 28°C to 24°C, the system will control the cooling water temperature to 18°C ​​and the flow rate to 2L / min, and continue cooling until the ink temperature reaches the target value. Similarly, when the temperature is below 22°C, the system will start the heating device to increase the temperature appropriately to ensure that the ink always remains within the optimal operating temperature range.

[0117] In one embodiment, referring to Figure 6 , the method further comprises the steps of:

[0118] S610: Detect the number of times the screen is used and the surface state parameters of the screen.

[0119] In this embodiment, an automatic counting system records the number of times the screen is used, while optical inspection equipment scans and inspects the screen surface. The system can calculate the cumulative number of screen uses in real time and capture images of the screen surface using a high-resolution camera, providing key parameters such as mesh clogging rate and screen wear.

[0120] Specifically, the system uses an industrial camera to scan the screen surface, covering the entire graphic area. For example, the system divides the screen into 12 inspection zones, capturing surface conditions in each zone. Using image processing algorithms, the system calculates the mesh blockage rate and simultaneously detects defects such as scratches and deformation on the screen surface, generating a complete data set of state parameters.

[0121] S620: Input the number of uses and screen surface condition parameters into a preset screen condition evaluation model.

[0122] Step S620 uses a preset screen condition assessment model to comprehensively analyze the collected data. The model comprehensively considers the screen's service life characteristics and surface condition variation patterns, and calculates the overall screen condition score through weighted calculation of multiple assessment indicators.

[0123] Specifically, the assessment model sets the normal lifespan of a screen at 10,000 uses, and enters the critical monitoring phase when the number of uses reaches 8,000. The model assigns weights to different parameters, such as 0.4 for the number of uses, 0.3 for the mesh clogging rate, and 0.3 for the surface wear. If the number of uses reaches 9,000, the mesh clogging rate is 5%, and minor surface wear is observed, the model calculates a health score between 0 and 100 based on these parameters.

[0124] S630: Determine whether the screen needs to be replaced based on the output result of the screen status evaluation model.

[0125] S640: If yes, a screen replacement prompt is issued to the operator.

[0126] It should be understood that the size of the serial numbers of the steps in the above embodiments does not mean the order of execution. The execution order of each process should be determined by its function and internal logic, and should not constitute any limitation on the implementation process of the embodiments of this application.

[0127] In the second aspect, the present application provides a PCB silk screen ink layer thickness uniformity control system. The PCB silk screen ink layer thickness uniformity control system of the present application is described below in combination with the above-mentioned PCB silk screen ink layer thickness uniformity control method.

[0128] Reference Figure 7 , a PCB screen printing ink layer thickness uniformity control system, comprising:

[0129] Data acquisition module, used to collect the actual thickness data of the ink layer and the screen tension data of the PCB screen printing area;

[0130] Uniformity analysis module, used to analyze the screen printing quality based on the actual ink layer thickness data and screen tension data to obtain the ink layer uniformity analysis results;

[0131] The process compensation analysis module is used to perform process compensation analysis based on the ink layer uniformity analysis results and obtain corresponding process compensation parameters;

[0132] The parameter adjustment module is used to adjust the screen printing pressure, scraper angle and printing speed according to the process compensation parameters, and send the adjusted parameters to the screen printing equipment for execution.

[0133] In one embodiment, the uniformity analysis module includes:

[0134] Thickness acquisition unit, used to obtain the actual thickness data of the ink layer at multiple measuring points in the PCB silk screen area;

[0135] The deviation calculation unit is used to compare the actual ink layer thickness data of each measuring point with the preset standard ink layer thickness and calculate the ink layer thickness deviation value of each point;

[0136] Tension analysis unit, used to obtain the screen tension data of the corresponding measurement point and analyze the corresponding relationship between the screen tension and the ink layer thickness deviation value;

[0137] The result generating unit is used to determine the influence degree of the screen tension on the ink layer uniformity according to the corresponding relationship, and generate the ink layer uniformity analysis result.

[0138] In one embodiment, the process compensation analysis module includes:

[0139] Statistical analysis unit, used to perform statistical analysis on the ink layer thickness deviation in the ink layer uniformity analysis results to obtain the overall deviation characteristics of the PCB screen printing area;

[0140] The coefficient calculation unit is used to calculate the comprehensive influence coefficient of the screen tension distribution on the ink layer uniformity based on the overall deviation characteristics;

[0141] The compensation parameter generating unit is used to determine the overall compensation level of the process parameters according to the comprehensive influence coefficient and generate corresponding process compensation parameters.

[0142] Among them, the compensation parameter generation unit performs the following steps: according to the size of the comprehensive influence coefficient, the process parameter compensation is divided into first-level compensation, second-level compensation and third-level compensation; when the process parameter compensation is first-level compensation, the overall screen printing pressure compensation value is adjusted; when the process parameter compensation is second-level compensation, the overall screen printing pressure compensation value and the overall scraper angle compensation value are adjusted; when the process parameter compensation is third-level compensation, the overall screen printing pressure compensation value, the overall scraper angle compensation value and the overall printing speed compensation value are adjusted.

[0143] In one embodiment, the system further comprises:

[0144] Ink monitoring module, used to detect the viscosity and temperature of screen printing ink;

[0145] An ink adjustment module is used to compare the viscosity value with a preset viscosity value range, and when the viscosity value exceeds the preset viscosity value range, an ink adjustment instruction is issued to the screen printing equipment;

[0146] The temperature control module is used to compare the temperature value with the preset temperature value range. When the temperature value exceeds the preset temperature value range, the temperature control system is triggered to adjust.

[0147] In one embodiment, the system further comprises:

[0148] Screen monitoring module, used to detect the number of times the screen is used and the screen surface condition parameters;

[0149] A screen evaluation module, for inputting the number of uses and screen surface condition parameters into a preset screen condition evaluation model;

[0150] The prompt module is used to determine whether the screen needs to be replaced based on the output results of the screen status evaluation model, and if so, issue a screen replacement prompt to the operator.

[0151] In one embodiment, the present application provides an electronic device, which may be a server, and its internal structure diagram may be as follows: Figure 8 As shown. The electronic device includes a processor, a memory, and a network interface connected via a system bus. The processor of the electronic device is used to provide computing and control capabilities. The memory of the electronic device includes a non-volatile storage medium and an internal memory. The non-volatile storage medium stores an operating system, a computer program, and a database. The internal memory provides an environment for the operation of the operating system and computer program in the non-volatile storage medium. The database of the electronic device is used to store data. The network interface of the electronic device is used to communicate with an external terminal via a network connection. When the computer program is executed by the processor, a method for controlling the thickness uniformity of a PCB screen printing ink layer is implemented.

[0152] Those skilled in the art will understand that Figure 8 The structure shown in the figure is only a block diagram of a part of the structure related to the solution of the present application, and does not constitute a limitation on the electronic device to which the solution of the present application is applied. The specific electronic device may include more or fewer components than shown in the figure, or combine certain components, or have a different component arrangement.

[0153] In one embodiment, an electronic device is further provided, including a memory and a processor. The memory stores a computer program, and the processor implements the steps in the above method embodiments when executing the computer program.

[0154] Those skilled in the art will appreciate that all or part of the processes in the above-described method embodiments can be implemented by instructing the relevant hardware through a computer program. The above-described computer program can be stored in a non-volatile computer-readable storage medium. When executed, the computer program can include the processes of the above-described method embodiments. Any reference to memory, storage, database, or other media used in the embodiments provided herein may include at least one of non-volatile and volatile memory. Non-volatile memory may include read-only memory (ROM), magnetic tape, floppy disk, flash memory, or optical storage. Volatile memory may include random access memory (RAM) or external cache memory. By way of illustration and not limitation, RAM can be in various forms, such as static random access memory (SRAM) or dynamic random access memory (DRAM).

[0155] The above are all preferred embodiments of the present application, and are not intended to limit the scope of protection of the present application. Therefore, any equivalent changes made based on the structure, shape, and principle of the present application should be included in the scope of protection of the present application.

Claims

1. A method for controlling the thickness uniformity of a PCB screen printing ink layer, characterized in that: The steps include: Collect the actual thickness data of the ink layer and the screen tension data of the PCB screen printing area; Analyze the screen printing quality according to the actual ink layer thickness data and the screen tension data to obtain an ink layer uniformity analysis result; Performing process compensation analysis based on the ink layer uniformity analysis results to obtain corresponding process compensation parameters; Adjusting the screen printing pressure, scraper angle and printing speed according to the process compensation parameters, and sending the adjusted parameters to the screen printing equipment for execution; The silk screen printing quality is analyzed according to the actual ink layer thickness data and the screen tension data to obtain the ink layer uniformity analysis result, which specifically includes the following steps: Obtain the actual thickness data of the ink layer at multiple measurement points in the PCB silk screen area; Compare the actual ink layer thickness data of each measuring point with the preset standard ink layer thickness, and calculate the ink layer thickness deviation value of each point; Obtain the screen tension data of the corresponding measurement point and analyze the corresponding relationship between the screen tension and the ink layer thickness deviation value; Determining the influence of screen tension on ink layer uniformity according to the corresponding relationship, and generating ink layer uniformity analysis results; According to the ink layer uniformity analysis result, a process compensation analysis is performed to obtain corresponding process compensation parameters, which specifically includes the following steps: Performing statistical analysis on the ink layer thickness deviation in the ink layer uniformity analysis result to obtain the overall deviation characteristics of the PCB screen printing area; Based on the overall deviation characteristics, calculating the comprehensive influence coefficient of screen tension distribution on ink layer uniformity; Determine the overall compensation level of the process parameters according to the comprehensive influence coefficient and generate corresponding process compensation parameters; The overall compensation level of the process parameters is determined according to the comprehensive influence coefficient, and the corresponding process compensation parameters are generated, which specifically includes the following steps: According to the size of the comprehensive influence coefficient, the process parameter compensation is divided into primary compensation, secondary compensation and tertiary compensation; When the process parameter compensation is level one, adjust the overall screen printing pressure compensation value; When the process parameter compensation is level 2 compensation, adjust the overall screen printing pressure compensation value and the overall scraper angle compensation value; When the process parameter compensation is level three, adjust the overall screen printing pressure compensation value, the overall scraper angle compensation value, and the overall printing speed compensation value.

2. The method for controlling the thickness uniformity of a PCB screen printing ink layer according to claim 1, wherein: The method further comprises the steps of: Detect the viscosity and temperature of screen printing ink; Comparing the viscosity value with a preset viscosity value range, and sending an ink adjustment instruction to the screen printing device when the viscosity value exceeds the preset viscosity value range; The temperature value is compared with a preset temperature value range, and when the temperature value exceeds the preset temperature value range, the temperature control system is triggered to adjust.

3. The method for controlling the thickness uniformity of a PCB screen printing ink layer according to claim 1, wherein: The method further comprises the steps of: Detect the number of times the screen is used and the surface condition parameters of the screen; Inputting the number of uses and the screen surface state parameters into a preset screen state evaluation model; Determine whether the screen needs to be replaced based on the output of the screen status assessment model: If so, a screen replacement prompt is issued to the operator.

4. A PCB screen printing ink layer thickness uniformity control system, characterized in that: The method for controlling the thickness uniformity of a PCB screen printing ink layer according to any one of claims 1 to 3 comprises: Data acquisition module, used to collect the actual thickness data of the ink layer and the screen tension data of the PCB screen printing area; a uniformity analysis module, configured to analyze the silk screen printing quality according to the actual ink layer thickness data and the screen tension data, and obtain an ink layer uniformity analysis result; A process compensation analysis module, configured to perform process compensation analysis based on the ink layer uniformity analysis result to obtain corresponding process compensation parameters; The parameter adjustment module is used to adjust the screen printing pressure, scraper angle and printing speed according to the process compensation parameters, and send the adjusted parameters to the screen printing equipment for execution.

5. An electronic device, characterized in that: The invention comprises a memory, a processor and a computer program stored in the memory and executable on the processor, wherein when the processor executes the computer program, the steps of the method for controlling the thickness uniformity of a PCB screen printing ink layer according to any one of claims 1 to 3 are implemented.

6. A computer-readable storage medium having a computer program stored thereon, characterized in that: When the computer program is executed by a processor, the steps of the method for controlling the thickness uniformity of a PCB screen printing ink layer according to any one of claims 1 to 3 are implemented.

Images