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

Abstract

The invention relates to the technical field of screen printing, in particular to a PCB screen printing ink layer thickness uniformity control method, system and device and a medium. The method comprises the following steps: firstly, collecting ink layer actual thickness data and screen tension data of a PCB screen printing area, then analyzing the relevance between the two data to obtain an ink layer uniformity analysis result, further determining proper compensation parameters through process compensation analysis, finally dynamically adjusting screen printing pressure, scraper angle and printing speed, bringing screen tension into a control system, and finally, controlling the screen printing uniformity. Compared with the prior art, the method has the advantages that the adaptability and the reliability are higher, and the product yield can be improved.

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 of a PCB. Background Art

[0002] As electronic products develop towards miniaturization and high density, PCB screen printing technology plays an increasingly important role in electronic manufacturing. The quality of screen printing technology directly affects the performance and reliability of PCB. Among them, the uniformity of ink layer thickness is one of the key indicators to measure the quality of screen printing, which has an important impact on subsequent welding and protection effects.

[0003] At present, the PCB screen printing process is mainly processed by automated screen printing equipment, and the thickness of the ink layer is controlled by setting process parameters such as screen printing pressure, scraper angle and printing speed. The screen printing equipment will perform printing according to the preset process parameters and monitor the printing quality online through an optical detection system.

[0004] However, the existing technology only relies on preset fixed process parameters for control and is unable to dynamically compensate for the impact of screen tension changes on ink layer uniformity, resulting in frequent problems of uneven ink layer thickness in actual production, affecting product yield. This situation needs to be further improved. Summary of the invention

[0005] In order to solve the problem that it is difficult for existing PCB screen printing to ensure the uniformity of the ink layer thickness in the entire screen printing area, affecting the product yield, the present application provides a PCB screen printing ink layer thickness uniformity control method, system, device and medium, using the following technical solutions: 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: 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; According to the ink layer uniformity analysis result, a process compensation analysis is performed to obtain corresponding process compensation parameters; 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 device for execution.

[0006] By adopting the above technical solution, the existing PCB screen printing usually adopts fixed process parameters for control, or only relies on manual experience to adjust parameters, which cannot respond to the changes in screen tension in time, and it is difficult to establish an accurate compensation mechanism; the present application first collects the actual thickness data of the ink layer and the 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, and finally dynamically adjusts the screen printing pressure, scraper angle and printing speed, and incorporates the screen tension into the control system, thereby realizing the precise control of the ink layer thickness. Compared with the existing technology, it has stronger adaptability and reliability, and can improve product yield.

[0007] Optionally, the screen printing quality is analyzed according to the actual ink layer thickness data and the screen tension data to obtain an 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 screen printing 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 measuring point and analyze the corresponding relationship between the screen tension and the ink layer thickness deviation value; The influence degree of screen tension on ink layer uniformity is determined according to the corresponding relationship, and an ink layer uniformity analysis result is generated.

[0008] 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 obviously thinner than that in the central area. However, it is difficult to take effective compensation measures because 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. The application first obtains the actual thickness data of the ink layer at 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 position 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.

[0009] Optionally, 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, the comprehensive influence coefficient of screen tension distribution on ink layer uniformity is calculated; The overall compensation level of the process parameters is determined according to the comprehensive influence coefficient, and the corresponding process compensation parameters are generated.

[0010] By adopting the above technical solution, the present application first performs statistical analysis on the ink layer thickness deviation data and extracts deviation indicators that can characterize the characteristics of the entire PCB screen printing 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.

[0011] 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: 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 compensation, adjust the overall screen printing pressure compensation value, the overall scraper angle compensation value and the overall printing speed compensation value.

[0012] 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 of 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 comprehensively adjusted, thereby realizing progressive compensation according to the degree of deviation of the uniformity of the ink layer, 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 and improve the compensation effect.

[0013] Optionally, the method further comprises the following steps: Detect the viscosity and temperature of screen printing ink; Comparing the viscosity value with a preset viscosity value range, and when the viscosity value exceeds the preset viscosity value range, sending an ink adjustment instruction to the screen printing device; 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.

[0014] 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 state, thereby improving production efficiency.

[0015] Optionally, the method further comprises the following steps: Detect the number of times the screen is used and the surface condition parameters of the screen; Inputting the number of times of use 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 result of the screen status assessment model: If so, a screen replacement reminder is issued to the operator.

[0016] By adopting the above technical scheme, 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. The present application first records the number of times the screen has been used in real time, and detects various state parameters of the screen surface at the same time; then inputs these data into a pre-established screen state 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 excessive use of the screen, and being able to more accurately predict the best time to replace the screen, which significantly improves the scientificity and economy of screen management.

[0017] In a second aspect, the present application provides a PCB screen printing ink layer thickness uniformity control system, comprising: 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, used to analyze the screen printing quality according to the actual thickness data of the ink layer and the screen tension data, and obtain an ink layer uniformity analysis result; A process compensation analysis module, used to perform process compensation analysis according to 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 device for execution.

[0018] 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 executable 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.

[0019] 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 PCB screen printing ink layer thickness uniformity control method.

[0020] In summary, the present application includes at least one of the following beneficial technical effects: 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, 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; 2. In actual production, it is often found that the ink layer thickness at the edge of the PCB is significantly thinner than that at the center. However, it is difficult to take effective compensation measures because 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. This application first obtains the actual ink layer thickness data at each measurement point, and compares it with the 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 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. 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 there is a serious impact, the three parameters of pressure, angle and speed are adjusted comprehensively, realizing progressive compensation according to the degree of deviation of the uniformity of the ink layer, 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 and improve the compensation effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a flow chart of a method for controlling uniformity of PCB screen printing ink layer thickness according to an embodiment of the present application; Figure 2 It is a flow chart of step S120 in a method for controlling uniformity of PCB screen printing ink layer thickness in an embodiment of the present application; Figure 3 It is a flow chart of step S130 in a method for controlling uniformity of PCB screen printing ink layer thickness in an embodiment of the present application; Figure 4 It is a flow chart of step S133 in a method for controlling uniformity of PCB screen printing ink layer thickness in an embodiment of the present application; Figure 5 It is a schematic diagram of a process for adjusting ink and temperature in a method for controlling uniformity of PCB screen printing ink layer thickness in an embodiment of the present application; Figure 6 It 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 in an embodiment of the present application; Figure 7 This is a module schematic diagram of a PCB screen printing ink layer thickness uniformity control system according to an embodiment of the present application; Figure 8 It is a diagram of the internal structure of an electronic device according to an embodiment of the present application. DETAILED DESCRIPTION

[0022] The terms used in the following embodiments of the present application are only for the purpose of describing specific embodiments, and are not intended to be used as limitations to the present application. As used in the specification and appended claims of the present application, the singular expressions "one", "a kind of", "said", "above", "the" and "this" are intended to also include plural expressions, unless there is a clear indication to the contrary in the context. It should also be understood that the term "and / or" used in the present application refers to any or all possible combinations comprising one or more listed items.

[0023] In the following, the terms "first" and "second" are used for descriptive purposes only and are not to be understood as suggesting or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features, and in the description of the embodiments of the present application, unless otherwise specified, "plurality" means two or more.

[0024] The embodiments of the present application are further described in detail below in conjunction with the drawings in the specification.

[0025] 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: S110, collecting the actual thickness data of the ink layer and the screen tension data of the PCB screen printing area.

[0026] In this embodiment, the actual thickness data of the ink layer 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.

[0027] Specifically, on the PCB screen printing production line, an automatic thickness measurement system and a tension detection system are set up to perform real-time detection on multiple preset measurement points of each PCB board. For example, on a 300mm×400mm PCB board, 25 evenly distributed measurement points are selected to collect ink layer thickness data; at the same time, tension sensors are arranged at corresponding positions on the screen to collect screen tension data in real time. The measured data is transmitted to the control system through the data acquisition module as the basic data for subsequent analysis.

[0028] 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.

[0029] 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.

[0030] Specifically, data processing software is used to perform statistical analysis on the collected data and calculate the average value, standard deviation and coefficient of variation of the ink layer thickness. For example, when the standard ink layer thickness is set to 30μm, the system monitors the actual thickness value of each measurement point in real time and calculates the deviation from the standard value. At the same time, the screen tension data is analyzed. The normal tension range is 20-25N / cm. When local tension abnormalities occur, the system will mark the corresponding area and perform correlation analysis with the ink layer thickness deviation.

[0031] S130 . Perform process compensation analysis based on the ink layer uniformity analysis result to obtain corresponding process compensation parameters.

[0032] In this embodiment, the system automatically generates a corresponding process compensation solution based on the ink layer uniformity analysis result.

[0033] Specifically, when the system detects an abnormal uniformity of the ink layer, it first determines the degree and distribution characteristics of the deviation, and then calculates the corresponding process parameter adjustment amount based on the built-in compensation rules. For example, when it is detected that the ink layer in the edge area is thin, the system will calculate the screen printing pressure value that needs to be increased based on the degree of deviation. The calculation of the compensation parameters needs to take into account the adjustment range limit of the process parameters to ensure that the adjusted parameters are still within the acceptable range of the equipment.

[0034] 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.

[0035] 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.

[0036] Specifically, when the device receives the compensation instruction, it first performs a self-check on each actuator to confirm that the parameter adjustment can be performed, and then adjusts the screen printing pressure, scraper angle and printing speed in sequence according to the specified values. After the parameter adjustment is completed, the system will confirm the adjustment result and return the execution status information.

[0037] 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: S121, obtaining actual thickness data of the ink layer at multiple measuring points in the PCB screen printing area.

[0038] Among them, a high-precision thickness measuring device is used to set multiple measuring points in the PCB screen printing area. The distribution of these measuring points needs to cover the key areas of the PCB board, including the edge area, the center area and the special function area. The number and distribution density of the measuring points are determined according to the size and complexity of the PCB board.

[0039] Specifically, an automatic alignment system is used during measurement to ensure the consistency of each measurement position, and data is collected three times at each measurement point to take the average value to eliminate the influence of random errors. The measurement data is transmitted to the analysis system in real time through the data acquisition card, and the coordinates of each measurement point and the corresponding thickness value are stored in array form.

[0040] S122, comparing the actual ink layer thickness data of each measuring point with the preset standard ink layer thickness, and calculating the ink layer thickness deviation value of each point.

[0041] Among them, step S122 compares the collected actual thickness data with the preset standard ink layer thickness. The standard ink layer thickness is a target value preset according to the PCB process requirements. The system calculates the difference between the actual thickness of each measurement point and the standard thickness to obtain an ink layer thickness deviation distribution map.

[0042] Specifically, the system generates a heat map with 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.

[0043] S123, obtaining screen tension data of corresponding measuring points, and analyzing the corresponding relationship between the screen tension and the ink layer thickness deviation value.

[0044] The tension sensor collects the tension data of each monitoring point of the screen in real time and makes spatial correspondence with the ink layer thickness deviation data. The system establishes a screen tension distribution map and analyzes the change trend of the tension value and its spatial distribution characteristics.

[0045] Specifically, multiple tension sensors are installed on the screen, and the arrangement of the sensors corresponds to the thickness measurement points on the PCB. For example, when the screen tension in a certain area is detected to be 18N / cm, which is lower than 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 to establish a mapping relationship between tension anomaly and ink layer unevenness.

[0046] S124. Determine the influence of the screen tension on the ink layer uniformity according to the corresponding relationship, and generate an ink layer uniformity analysis result.

[0047] In this embodiment, step S124 analyzes the influence of screen tension on ink layer uniformity based on the established corresponding relationship. The system quantifies the influence of screen tension on ink layer uniformity by calculating the correlation coefficient between tension change and thickness deviation. The final generated ink layer uniformity analysis results include: thickness deviation values ​​of each area, distribution of tension abnormal areas, correlation between tension and thickness deviation, and other information.

[0048] In one embodiment, referring to Figure 3 In step S130, 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: S131. Statistically analyze the ink layer thickness deviation in the ink layer uniformity analysis result to obtain the overall deviation characteristics of the PCB screen printing area.

[0049] In this embodiment, a statistical analysis method is used to process the ink layer thickness deviation data, and key statistical indicators including average deviation value, standard deviation, maximum deviation and minimum deviation are calculated.

[0050] S132. Based on the overall deviation characteristics, the comprehensive influence coefficient of the screen tension distribution on the uniformity of the ink layer is calculated.

[0051] 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.

[0052] Specifically, the system uses a weighted calculation method to assign different weights to tension anomalies in different areas. For example, when the tension in the edge area decreases and causes the ink layer to be thicker, its influence weight is set to 0.6; when the tension anomaly in the center area causes the ink layer to deviate, its influence weight is set to 0.4. Through the combined calculation of these weight factors, a comprehensive influence coefficient ranging from 0 to 1 is finally obtained, where 0 indicates a small impact and 1 indicates a serious impact.

[0053] S133. Determine the overall compensation level of the process parameters according to the comprehensive influence coefficient, and generate corresponding process compensation parameters.

[0054] Among them, step S133 divides the compensation of process parameters into multiple levels according to the calculated comprehensive influence coefficient. The system pre-sets the parameter adjustment range corresponding to different compensation levels, selects the corresponding compensation level according to the size of the comprehensive influence coefficient, and thus determines the specific process compensation parameters.

[0055] 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: S1331. According to the size of the comprehensive influence coefficient, the process parameter compensation is divided into primary compensation, secondary compensation and tertiary compensation.

[0056] 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.

[0057] Specifically, when the system determines the compensation level, in addition to considering the value of the comprehensive influence coefficient, it will also verify it in combination with historical compensation data. For example, when the comprehensive influence coefficient of a certain test is 0.25, the system will query the compensation effect data under the same working conditions in the recent period. 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.

[0058] S1332. When the process parameter compensation is level one compensation, adjust the overall screen printing pressure compensation value.

[0059] Among them, for the first-level compensation, the overall screen printing pressure value is mainly adjusted. The system calculates the required pressure compensation amount according to the direction and size of the overall deviation of the ink layer. The adjustment range of the pressure compensation value is usually limited to ±10% of the original set value to ensure the safety of the adjustment.

[0060] Specifically, when the system performs the first-level compensation, if it detects that the overall ink layer is 0.5μm thinner, it is calculated 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 is calculated that the screen printing pressure needs to be reduced by 0.08MPa. The system will monitor the effect of the pressure adjustment in real time to ensure that the thickness of the ink layer after compensation tends to be uniform.

[0061] 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.

[0062] Among them, the secondary compensation adds compensation for the scraper angle on the basis of adjusting the screen printing pressure. The system will calculate the compensation values ​​of pressure and angle at the same time according to the uneven distribution characteristics of the ink layer thickness.

[0063] Specifically, in the secondary compensation, for example, when the overall deviation of the ink layer thickness is detected to exceed ±1.2μm, the system will adjust the screen printing pressure and the scraper angle at the same time. For example, when the pressure is increased by 0.12MPa, the scraper angle is adjusted from 70 degrees to 73 degrees. The coordinated adjustment of the two parameters can more effectively improve the uniformity of the ink layer.

[0064] 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.

[0065] Among them, the three-level compensation is the most comprehensive compensation solution, which adjusts three key process parameters at the same time. The system will calculate the optimal compensation combination of the three parameters based on the specific values ​​of the comprehensive influence coefficients to ensure that the adjustment amount of each parameter is within the range allowed by the equipment.

[0066] Specifically, when performing three-level compensation, for example, when the comprehensive influence coefficient is 0.8, the system will generate the following compensation plan: the screen printing pressure is increased by 0.15MPa, the scraper angle is adjusted from 70 degrees to 75 degrees, and the printing speed is reduced from 60mm / s to 50mm / s. The system will monitor the adjustment effects of these three parameters in real time and make fine adjustments when necessary to obtain the best compensation effect.

[0067] In one embodiment, referring to Figure 5 , the method further comprises the following steps: S510, detecting the viscosity and temperature of the screen printing ink.

[0068] In this embodiment, an automatic detection system is used to monitor the key physical parameters of screen printing ink in real time. The system is equipped with a high-precision viscometer and temperature sensor, which can continuously collect the viscosity and temperature data of the ink. The sampling frequency can be adjusted according to the production rhythm to ensure that abnormal changes in the ink state are discovered in time.

[0069] S520, comparing the viscosity value with a preset viscosity value range, and when the viscosity value exceeds the preset viscosity value range, sending an ink adjustment instruction to the screen printing device.

[0070] In this embodiment, a standard working range of ink viscosity is preset. The system compares the viscosity value detected in real time with the preset range in real time. When the viscosity value is detected to be out of the range, the control system automatically calculates the required adjustment amount and sends a corresponding adjustment instruction to the automatic ink adding system.

[0071] Specifically, assuming that the standard viscosity range of the ink is set to 15000-20000mPa·s, when the ink viscosity is detected to reach 21000mPa·s, the system determines that the viscosity is too high and automatically calculates the amount of diluent that needs to be added. For example, according to the calculation, if 50ml of diluent needs to be added, the system will control the diluent pump to add it accurately, and re-test the viscosity value after the addition is completed to ensure that the adjustment effect meets the requirements.

[0072] S530: Compare the temperature value with a preset temperature value range, and when the temperature value exceeds the preset temperature value range, trigger the temperature control system to adjust.

[0073] 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.

[0074] 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 for appropriate temperature increase to ensure that the ink always remains within the optimal operating temperature range.

[0075] In one embodiment, referring to Figure 6 , the method further comprises the following steps: S610, detecting the number of times the screen is used and the surface state parameters of the screen.

[0076] In this embodiment, the number of times the screen is used is recorded by an automatic counting system, and the optical detection device is used to scan and detect the screen surface. The system can count the cumulative number of times the screen is used in real time, and collect the state image of the screen surface through a high-resolution camera to obtain key parameters such as mesh blockage rate and screen wear.

[0077] Specifically, the system uses an industrial camera to scan the screen surface, and the scanning area covers the entire graphic area. For example, the system divides the screen into 12 detection areas, and collects surface status in each area in turn. The mesh blockage rate is calculated through image processing algorithms, and scratches, deformations and other defects on the screen surface are detected at the same time to form a complete state parameter data set.

[0078] S620: Input the number of times of use and screen surface state parameters into a preset screen state evaluation model.

[0079] In step S620, a preset screen status evaluation model is used to comprehensively analyze the collected data. The model comprehensively considers the service life characteristics and surface status change rules of the screen, and obtains the overall status score of the screen through weighted calculation of multiple evaluation indicators.

[0080] Specifically, the evaluation model sets the normal service life of the screen to 10,000 times, and enters the key monitoring stage when the number of uses reaches 8,000. The model sets weight coefficients for different parameters, such as the weight of the number of uses is 0.4, the weight of the mesh blockage rate is 0.3, and the weight of the surface wear is 0.3. When it is detected that the number of uses is 9,000 times, the mesh blockage rate is 5%, and the surface is slightly worn, the model will calculate a status score between 0-100 based on these parameters.

[0081] S630: Determine whether the screen needs to be replaced according to the output result of the screen status evaluation model.

[0082] S640: If yes, a screen replacement prompt is issued to the operator.

[0083] 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 the present application.

[0084] 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.

[0085] Reference Figure 7 , a PCB screen printing ink layer thickness uniformity control system, comprising: 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; Uniformity analysis module, used to analyze the screen printing quality according to the actual ink layer thickness data and screen tension data, and obtain the ink layer uniformity analysis results; The process compensation analysis module is used to perform process compensation analysis based on the ink layer uniformity analysis results 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.

[0086] In one embodiment, the uniformity analysis module includes: Thickness acquisition unit, used to obtain the actual thickness data of the ink layer at multiple measuring points in the PCB screen printing area; 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; The tension analysis unit is used to obtain the screen tension data of the corresponding measuring point and analyze the corresponding relationship between the screen tension and the ink layer thickness deviation value; The result generating unit is used to determine the influence degree of screen tension on ink layer uniformity according to the corresponding relationship, and generate ink layer uniformity analysis results.

[0087] In one embodiment, the process compensation analysis module includes: A statistical analysis unit is used to perform 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; A coefficient calculation unit is used to calculate the comprehensive influence coefficient of screen tension distribution on ink layer uniformity based on the overall deviation characteristics; 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.

[0088] Among them, the compensation parameter generation unit performs the following steps, dividing the process parameter compensation into primary compensation, secondary compensation and tertiary compensation according to the size of the comprehensive influence coefficient; when the process parameter compensation is primary compensation, adjusting the overall screen printing pressure compensation value; when the process parameter compensation is secondary compensation, adjusting the overall screen printing pressure compensation value and the overall scraper angle compensation value; when the process parameter compensation is tertiary compensation, adjusting the overall screen printing pressure compensation value, the overall scraper angle compensation value and the overall printing speed compensation value.

[0089] In one embodiment, the system further comprises: Ink monitoring module, used to detect the viscosity and temperature of screen printing ink; 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 sent to the screen printing device; 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.

[0090] In one embodiment, the system further comprises: Screen monitoring module, used to detect the number of times the screen is used and the surface state parameters of the screen; A screen evaluation module, used for inputting the number of times of use and screen surface state parameters into a preset screen state evaluation model; The prompt module is used to determine whether the screen needs to be replaced according to the output result of the screen status evaluation model, and if so, issue a screen replacement prompt to the operator.

[0091] 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 through a system bus. Among them, 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 the 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 through a network connection. When the computer program is executed by the processor, a method for controlling the uniformity of the thickness of a PCB screen printing ink layer is implemented.

[0092] Those skilled in the art will understand that Figure 8 The structure shown in the figure is merely a block diagram of a partial structure related to the scheme of the present application, and does not constitute a limitation on the electronic device to which the scheme 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 arrangement of components.

[0093] In one embodiment, an electronic device is further provided, including a memory and a processor, wherein a computer program is stored in the memory, and the processor implements the steps in the above method embodiments when executing the computer program.

[0094] Those of ordinary skill in the art can understand that all or part of the processes in the above-mentioned embodiment methods can be completed by instructing the relevant hardware through a computer program, and the above-mentioned computer program can be stored in a non-volatile computer-readable storage medium. When the computer program is executed, it can include the processes of the embodiments of the above-mentioned methods. Among them, any reference to memory, storage, database or other media used in the embodiments provided in this application can include at least one of non-volatile and volatile memory. Non-volatile memory can include read-only memory (ROM), tape, floppy disk, flash memory or optical memory, etc. Volatile memory can include random access memory (RAM) or external cache memory. As an illustration and not limitation, RAM can be in various forms, such as static random access memory (SRAM) or dynamic random access memory (DRAM).

[0095] The above are all preferred embodiments of the present application, and the protection scope of the present application is not limited thereto. Therefore, any equivalent changes made according to the structure, shape, and principle of the present application should be included in the protection scope of the present application.

Claims

1. A method for controlling the uniformity of PCB screen printing ink layer thickness, 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; According to the ink layer uniformity analysis result, a process compensation analysis is performed to obtain corresponding process compensation parameters; 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 device for execution.

2. The method for controlling the thickness uniformity of a PCB screen printing ink layer according to claim 1, characterized in that: 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: Obtain the actual thickness data of the ink layer at multiple measurement points in the PCB screen printing 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 measuring point and analyze the corresponding relationship between the screen tension and the ink layer thickness deviation value; The influence degree of screen tension on ink layer uniformity is determined according to the corresponding relationship, and an ink layer uniformity analysis result is generated.

3. The method for controlling the thickness uniformity of a PCB screen printing ink layer according to claim 2, characterized in that: 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, the comprehensive influence coefficient of screen tension distribution on ink layer uniformity is calculated; The overall compensation level of the process parameters is determined according to the comprehensive influence coefficient, and the corresponding process compensation parameters are generated.

4. The method for controlling the thickness uniformity of a PCB screen printing ink layer according to claim 3, characterized in that: 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: 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 compensation, adjust the overall screen printing pressure compensation value, the overall scraper angle compensation value and the overall printing speed compensation value.

5. The method for controlling the thickness uniformity of a PCB screen printing ink layer according to claim 1, characterized in that: 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 when the viscosity value exceeds the preset viscosity value range, sending an ink adjustment instruction to the screen printing device; 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.

6. The method for controlling the thickness uniformity of a PCB screen printing ink layer according to claim 1, characterized in that: 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 times of use 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 result of the screen status assessment model: If so, a screen replacement reminder is issued to the operator.

7. A PCB screen printing ink layer thickness uniformity control system, characterized in that: include: 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, used to analyze the screen printing quality according to the actual thickness data of the ink layer and the screen tension data, and obtain an ink layer uniformity analysis result; A process compensation analysis module, used to perform process compensation analysis according to 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 device for execution.

8. 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 6 are implemented.

9. 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 6 are implemented.

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