Washing and drying constant-temperature control method for cadmium plating production line

Abstract

The invention relates to the technical field of temperature control, in particular to a washing and drying constant-temperature control method for a cadmium plating production line, which comprises the following steps of: acquiring a plurality of reference washing stages and a plurality of reference drying stages, and determining a reference value index according to remodeling times and cadmium plating quality scores corresponding to a plurality of historical cadmium plating processes; according to the water temperature change fluctuation curve of each time of water washing in each reference water washing stage, determining an effectiveness index by combining the water washing times of each reference water washing stage; the reference value index and the effectiveness index of each reference washing stage are used for adjustment, and the temperature adjustment range of each current washing stage is obtained; and performing washing and drying constant temperature control on the cadmium plating production line according to the temperature adjustment ranges of each current washing stage and each current drying stage. According to the method, the temperature of the current cadmium plating production line is adjusted through the excellent constant temperature control conditions of each reference washing stage and each reference drying stage, and the control reasonability of the washing drying temperature is effectively improved.

Description

Technical Field

[0001] This invention relates to the field of temperature control technology, and specifically to a method for constant temperature control of water washing and drying in a cadmium plating production line. Background Technology

[0002] Cadmium plating is a technology that uses electrochemical deposition to form a cadmium coating on a metal surface. It is widely used in aerospace, automotive, and electronics industries to improve the corrosion resistance and conductivity of materials. In cadmium plating production lines, the washing and drying process is a key step in ensuring coating quality. Its core objective is to remove residual chemicals from the surface and prevent secondary contamination, while optimizing drying efficiency and coating performance through constant temperature control.

[0003] Existing water washing and drying temperature control cannot predict temperature control failure in real time. It is necessary to wait for an abnormality to occur (such as temperature exceeding the limit) before starting rework or multiple water washing processes. This will affect the thickness of the plated surface or the adhesion of the electroplated layer. Moreover, the existing temperature control relies on the operator's experience and is difficult to adapt to the changing types of plated parts or water quality conditions, resulting in low rationality for the control of water washing and drying temperature. Summary of the Invention

[0004] To address the aforementioned technical problem of low rationality in existing water washing and drying temperature control, the present invention aims to provide a method for constant temperature control during water washing and drying in a cadmium plating production line. The specific technical solution adopted is as follows:

[0005] One embodiment of the present invention provides a method for controlling the constant temperature of water washing and drying in a cadmium plating production line, the method comprising the following steps:

[0006] Obtain several reference washing stages and several reference drying stages corresponding to each current washing stage in the current washing and drying process of the cadmium plating production line.

[0007] Based on the number of remodeling cycles and the cadmium plating quality score corresponding to several historical cadmium plating processes, the reference value index of various temperature control parameters is determined when constant temperature control is performed in each of the reference water washing stages in each historical cadmium plating process.

[0008] Based on the fluctuation of the water temperature change fluctuation curve in each water wash within each reference water wash stage, and combined with the number of water washes in each reference water wash stage, the effectiveness index of constant temperature control in each reference water wash stage is determined.

[0009] Using the reference value index and the effectiveness index of each reference washing stage, the preset temperature range of the current washing stage corresponding to the reference washing stage is adjusted to obtain the temperature adjustment range of each current washing stage.

[0010] Based on the drying temperature and reshaping number of each reference drying stage, the temperature adjustment range of the current drying stage is determined, and then combined with the temperature adjustment range of each current water washing stage, the water washing and drying constant temperature control of the cadmium plating production line is carried out.

[0011] Furthermore, the acquisition of several reference washing stages and several reference drying stages corresponding to each current washing stage in the current washing and drying process of the cadmium plating production line includes:

[0012] Obtain the plated part quality parameter values ​​of the preceding operation modules of the current candidate stage, and obtain the plated part quality parameter values ​​of the preceding operation modules of several historical candidate stages corresponding to the current candidate stage during the historical water washing and drying process.

[0013] By analyzing the differences in the plated part quality parameter values ​​between the current candidate stage and several historical candidate stages, several reference candidate stages are selected corresponding to the current candidate stage; wherein, the candidate stages are the washing stage and the drying stage.

[0014] Furthermore, the reference value indicators for determining the various temperature control parameters during the constant temperature control of each reference water washing stage in each historical cadmium electroplating process include:

[0015] The number of replating operations caused by water washing during several historical cadmium electroplating processes was obtained, along with the total number of re-plating operations and the cadmium electroplating quality score during several historical cadmium electroplating processes.

[0016] For each historical cadmium electroplating process, based on the ratio of the number of replating times caused by water washing to the total number of re-plating times, the total number of re-plating times, and the cadmium electroplating quality score, the reference value indicators of various temperature control parameters when performing constant temperature control in each reference water washing stage of the historical cadmium electroplating process are determined.

[0017] Furthermore, the reference value indicators for historical cadmium electroplating processes are determined, including:

[0018] Calculate the negative correlation between the ratio and the total number of remodeling operations, and use the fusion result of the two negative correlation values ​​as the reference weight for the electroplated cadmium quality score;

[0019] After weighting the electroplated cadmium quality score using the reference weights, normalization is performed to obtain a reference value index for historical water washing.

[0020] Furthermore, the determination of the effectiveness indicators for temperature control during each reference washing stage includes:

[0021] For each reference water washing stage, obtain the water temperature change fluctuation curve for each water washing within the reference water washing stage;

[0022] Based on the fluctuation of the water temperature change curve for each wash, determine the normality of constant temperature control for each wash within the reference wash stage.

[0023] Based on the changing trend of the normality of temperature control during the reference water washing stage, and in combination with the number of water washings in the reference water washing stage, the effectiveness index of temperature control during the reference water washing stage is determined.

[0024] Furthermore, determining the normality of temperature control for each wash during the reference washing stage includes:

[0025] The first water temperature change factor for each water wash is determined based on the slope value of each data point on the water temperature change fluctuation curve for each water wash.

[0026] The second water temperature change factor for each water wash is determined based on the number of temperatures exceeding the preset temperature threshold range on the water temperature change fluctuation curve for each water wash.

[0027] By performing a fusion analysis on the first and second water temperature change factors of the same water wash, the normality of constant temperature control for each water wash within the reference water wash stage can be obtained.

[0028] The degree of normal temperature control is negatively correlated with both the first water temperature change factor and the second water temperature change factor.

[0029] Furthermore, the effectiveness indicators for determining the temperature control during the reference washing stage include:

[0030] The multiple washes within the reference wash stage are sorted according to their chronological order to obtain the sorted washes within the reference wash stage.

[0031] Calculate the difference between the normality of the constant temperature control of the previous and subsequent water washes after sorting, and determine the first effectiveness factor when the constant temperature control is performed in the reference water wash stage based on each of the differences corresponding to the reference water wash stage.

[0032] The number of washes in the reference wash stage is negatively correlated to determine the second effectiveness factor when the reference wash stage is under constant temperature control.

[0033] The first effectiveness factor and the second effectiveness factor are fused and analyzed when the reference water washing stage is subjected to constant temperature control to obtain the effectiveness index of the reference water washing stage is subjected to constant temperature control.

[0034] Furthermore, obtaining the temperature adjustment range for each current washing stage includes:

[0035] A fusion analysis is performed on the reference value index and the effectiveness index for the same reference washing stage to obtain the temperature correction coefficient for each reference washing stage;

[0036] Using the temperature correction coefficient for each reference washing stage, the upper limit temperature threshold of the reference washing stage corresponding to the current washing stage in different historical cadmium electroplating processes is weighted and summed to obtain the upper limit temperature value of the temperature adjustment range for each current washing stage.

[0037] Similarly, the lower limit threshold of the temperature range for each current cadmium plating stage is obtained by weighted summation of the reference rinsing stages corresponding to different historical cadmium plating processes.

[0038] Further, determining the temperature adjustment range for the current drying stage includes:

[0039] If the number of reshaping cycles in the reference drying stage is greater than the preset number, the reference drying stage is determined to be an abnormal drying stage; otherwise, the reference drying stage is determined to be a normal drying stage.

[0040] The average drying temperature of all abnormal drying stages is recorded as the first temperature threshold, and the average drying temperature of all normal drying stages is recorded as the second temperature threshold.

[0041] The temperature adjustment range for the current drying stage is determined based on the first temperature threshold and the second temperature threshold.

[0042] Further, determining the temperature adjustment range for the current drying stage based on the first temperature threshold and the second temperature threshold includes:

[0043] Calculate the difference between the first temperature threshold and the second temperature threshold, and use it as the temperature adjustment value;

[0044] The difference between the second temperature threshold and the temperature adjustment value is used as the upper limit of the temperature adjustment range for the current drying stage;

[0045] The value obtained by adding the second temperature threshold and the temperature adjustment value is used as the lower limit of the temperature adjustment range for the current drying stage.

[0046] The present invention has the following beneficial effects:

[0047] This invention provides a method for controlling the constant temperature during washing and drying in a cadmium plating production line. This method first determines historically relevant stages, i.e., reference washing and reference drying stages, for each current washing and drying stage. By analyzing the temperature control effectiveness of these historically relevant stages, the temperature control range for the current washing and drying stages is determined. This method not only allows for real-time prediction of temperature control failures, avoiding rework or multiple washing processes caused by waiting for abnormalities to occur, thus helping to ensure the thickness of the plated parts or the adhesion of the electroplated layer, but also does not rely on operator experience and can adapt to various plated parts types or water quality conditions. It exhibits stronger robustness in temperature control during washing and drying, thereby improving the efficiency of the cadmium plating production line and the production quality of the plated parts. First, the temperature control effect of different reference washing stages is determined from two aspects: the reference value index of temperature control parameters and the effectiveness index of temperature control. Then, the two indicators are combined to adjust the preset temperature range of the current washing stage, obtaining the temperature adjustment range for each current washing stage. This can effectively enhance the numerical accuracy of the temperature adjustment range of the washing stage and the reliability of temperature control. Next, the temperature adjustment range of the current drying stage is determined by combining the drying temperature and the number of remolding cycles of the reference drying stage. After determining the temperature adjustment range, the temperature control of the washing and drying process in the cadmium plating production line is carried out in combination with the temperature adjustment range of the current washing stage. Compared with existing methods, by analyzing the excellent performance of temperature control in each washing stage in the historical cadmium plating process, the temperature thresholds in the current washing and drying process can be controlled, improving the rationality of temperature control for washing and drying. Attached Figure Description

[0048] To more clearly illustrate the technical solutions and advantages in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0049] Figure 1 A flowchart of a water washing and drying constant temperature control method for a cadmium plating production line is provided as an embodiment of the present invention;

[0050] Figure 2 This is a flowchart illustrating the implementation of step S2 in an embodiment of the present invention;

[0051] Figure 3 This is a flowchart illustrating the implementation of step S3 in an embodiment of the present invention;

[0052] Figure 4 This is a flowchart illustrating the implementation of step S4 in an embodiment of the present invention. Detailed Implementation

[0053] To further illustrate the technical means and effects adopted by the present invention to achieve its intended purpose, the specific implementation methods, structures, features, and effects of the technical solution proposed according to the present invention are described in detail below with reference to the accompanying drawings and preferred embodiments. In the following description, different "one embodiment" or "another embodiment" do not necessarily refer to the same embodiment. Furthermore, specific features, structures, or characteristics in one or more embodiments can be combined in any suitable form.

[0054] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains.

[0055] The application scenarios targeted by this invention can be:

[0056] The composition of residual impurities to be removed varies with each wash, thus requiring different water temperatures for each stage. Current washing and drying processes do not consider historical temperature control performance. If temperature control abnormalities occur during the washing or drying stages, rework or multiple washes may be necessary, affecting the surface thickness of the plated parts or the adhesion of the electroplated layer. Furthermore, this method is difficult to adapt to varying types of plated parts or water quality conditions. Therefore, more reasonable temperature control is needed during the washing and drying process.

[0057] One embodiment of the present invention provides a method for controlling the constant temperature of water washing and drying in a cadmium plating production line, such as... Figure 1 As shown, it includes the following steps:

[0058] S1, obtain several reference washing stages and several reference drying stages corresponding to each current washing stage in the current washing and drying process of the cadmium plating production line.

[0059] Here, the reference washing stage refers to a historical washing stage with similar plating quality to the current washing stage, and the reference drying stage refers to a historical drying stage with similar plating quality to the current drying stage. Plating quality is represented by plating quality parameter values, such as average plating thickness.

[0060] As an exemplary implementation, the reference washing stage and the reference drying stage are obtained in the same way. To avoid repeatedly describing the same acquisition method, the washing stage and the drying stage are collectively referred to as candidate stages. Several reference candidate stages corresponding to the current candidate stage are obtained, including:

[0061] The first step is to obtain the plating quality parameter values ​​of the preceding operation modules of the current candidate stage, and to obtain the plating quality parameter values ​​of the preceding operation modules of several historical candidate stages that correspond to the current candidate stage during the washing and drying process.

[0062] Here, different cadmium electroplating processes all require a drying stage and multiple water washing stages. During the water washing and drying process, temperature is controlled by an electric heater and a PID (Proportional Integral Derivative) controller.

[0063] In one embodiment, the electroplating process for cadmium varies depending on the properties of the plating material. The historical washing and drying process and the current washing and drying process belong to the same type of electroplating process for cadmium, such as the electroplating process for carbon steel and the electroplating process for copper alloy. The electroplating process for cadmium includes multiple different washing stages.

[0064] In one embodiment, the processing method of the pre-processing module of each water washing stage is different, but the quantification method of the corresponding plated part quality parameter value can be the same. For example, taking the cadmium electroplating process as an example, after the cadmium electroplating process, the average coating thickness of a single batch of plated parts is recorded by an X-ray fluorescence thickness gauge. All plated part quality parameter values ​​are standardized parameter values, that is, the value range is between 0 and 1.

[0065] The second step is to select several reference candidate stages corresponding to the current candidate stage by analyzing the differences in the plated part quality parameter values ​​between the current candidate stage and several historical candidate stages.

[0066] In one embodiment, the absolute value of the difference between the plating quality parameter values ​​of the current candidate stage and each historical candidate stage is calculated, and the historical candidate stage whose absolute value of the difference is less than a preset difference value is used as the reference candidate stage corresponding to the current candidate stage. The preset difference value can be an empirical value of 0.5, which can be set by the implementer according to specific circumstances.

[0067] By referring to the process of obtaining several reference candidate stages corresponding to the current candidate stage, several reference washing stages and several reference drying stages corresponding to each current washing stage can be obtained.

[0068] S2. Based on the number of remodeling cycles and the cadmium plating quality score corresponding to several historical cadmium plating processes, determine the reference value indicators of various temperature control parameters when constant temperature control is performed in each reference water washing stage of each historical cadmium plating process.

[0069] Here, the reference value index refers to the effectiveness of various temperature control parameters during constant temperature control in the historical cadmium electroplating process. The reference value index values ​​of the reference water washing stage belonging to the same historical cadmium electroplating process are the same.

[0070] As an exemplary implementation, step S2 described above can be achieved through... Figure 2 The steps shown are to be implemented as follows:

[0071] S21, obtain the number of times replating was caused by water washing during several historical cadmium electroplating processes, and obtain the total number of remodeling times and the cadmium electroplating quality score during several historical cadmium electroplating processes.

[0072] In actual production processes, the plating may be damaged during the washing process, or the plating may have poor adhesion or poor gloss. Therefore, it may be necessary to remove the plating and re-plat or re-wash the plating. Thus, the reference value of temperature control parameters can be analyzed by analyzing the number of re-plating cycles.

[0073] In one embodiment, the more times replating is caused by water washing, the worse the temperature control effect during the water washing stage is. Therefore, it is necessary to obtain the number of times replating is caused by water washing.

[0074] In one embodiment, after the cadmium electroplating process is completed, the cadmium electroplating quality score of the plated parts is recorded when they are inspected and put into storage. For example, it is specifically divided into: first-class product 100 points, second-class product 90 points, and third-class product 80 points.

[0075] S22, for each historical cadmium electroplating process, based on the ratio of replating times to total remodeling times caused by water washing, the total number of remodeling times, and the cadmium electroplating quality score, determine the reference value indicators of various temperature control parameters when constant temperature control is performed in each reference water washing stage of the historical cadmium electroplating process.

[0076] Here, if the number of replating processes during the historical cadmium electroplating process is higher, and the number of replating processes is higher due to water washing or drying, it indicates that the process rationality of the historical cadmium electroplating process is lower. The higher the process rationality of the historical cadmium electroplating process, and the higher the cadmium electroplating quality score of the plated parts recorded in the warehouse, it indicates that the electroplating effect of the historical cadmium electroplating process is better. The reference value of various temperature control parameters when constant temperature control is performed at each reference water washing stage in the corresponding historical cadmium electroplating process is greater, that is, the reference value of various temperature control parameters is stronger.

[0077] As an exemplary implementation, the reference value indicators for historical cadmium electroplating processes are determined, including:

[0078] The first step is to calculate the negative correlation between the ratio and the total number of remodeling operations, and then use the fusion result of the two negative correlation values ​​as the reference weight for the cadmium electroplating quality score.

[0079] In one embodiment, the formula for calculating the reference weight of the cadmium plating quality score for the m-th historical cadmium plating process can be:

[0080] In the formula, α m A represents the reference weight for the cadmium plating quality score of the m-th historical cadmium plating process.m B represents the total number of reshaping operations in the m-th historical cadmium plating process. m This represents the number of replating operations caused by water washing in the m-th historical cadmium electroplating process. This represents the ratio of the number of replating times due to water washing to the total number of re-plating times corresponding to the m-th historical cadmium electroplating process. This indicates the negative correlation value of the ratio. The negative correlation value represents the total number of remodeling operations. In this embodiment, the total number of remodeling operations A m There is no possibility that it will be zero.

[0081] The second step involves weighting the electroplated cadmium quality score using reference weights and then normalizing it to obtain a reference value index for historical washing.

[0082] In one embodiment, the formula for calculating the reference value index of the m-th historical cadmium electroplating process can be:

[0083] θ m =norm(α) m ×V m In the formula, θ m This represents the reference value index of the m-th historical cadmium electroplating process, where norm represents the linear normalization function, and α... m V represents the reference weight for the cadmium plating quality score of the m-th historical cadmium plating process. m This represents the cadmium plating quality score for the m-th historical cadmium plating process.

[0084] Referring to the calculation process of the reference value index of the m-th historical cadmium electroplating process, the reference value index of each historical cadmium electroplating process can be obtained, and then the reference value index of each temperature control parameter when constant temperature control is performed in each reference water washing stage of each historical cadmium electroplating process can be determined.

[0085] S3. Based on the fluctuation of the water temperature change curve during each wash in each reference wash stage, and combined with the number of washes in each reference wash stage, determine the effectiveness index of constant temperature control in each reference wash stage.

[0086] Here, the effectiveness index refers to the importance of temperature control during the water washing stage in terms of cleaning effect, plating quality, and production stability.

[0087] As an exemplary implementation, step S3 described above can be achieved through... Figure 3 The steps shown are to be implemented as follows:

[0088] S31, for each reference water washing stage, obtain the water temperature change fluctuation curve for each water washing in the reference water washing stage.

[0089] In one embodiment, the water temperature value at each moment during each wash in a reference wash stage is obtained, and the water temperature value at each moment is curve-fitted using the least squares method to obtain the water temperature change fluctuation curve for each wash. A reference wash stage may include multiple wash operations, and each wash is associated with a corresponding water temperature change fluctuation curve. The horizontal axis of the water temperature change fluctuation curve represents time, and the vertical axis represents water temperature.

[0090] S32, based on the fluctuation of the water temperature change curve for each wash, determine the normality of constant temperature control for each wash within the reference wash stage.

[0091] Here, the degree of normal temperature control refers to the degree of temperature control during the washing process. The greater the degree of temperature control, the more normal the temperature control is during the corresponding washing process.

[0092] As an exemplary implementation, determining the normality of temperature control for each wash during the reference washing stage includes:

[0093] The first step is to determine the first water temperature change factor for each water wash based on the slope value of each data point on the water temperature change fluctuation curve for each water wash.

[0094] In one embodiment, the average of all slope values ​​on the water temperature change fluctuation curve is calculated as the first water temperature change factor for the corresponding water wash.

[0095] The second step is to determine the second water temperature change factor for each water wash based on the number of temperatures exceeding the preset temperature threshold range on the water temperature change fluctuation curve for each water wash.

[0096] In one embodiment, a preset temperature threshold range is set to 50°C to 60°C. Exceeding the preset temperature threshold range refers to a water temperature below 50°C or above 60°C. The number of temperatures exceeding the preset temperature threshold range on the water temperature fluctuation curve is counted, and the ratio of this number to the total number of temperatures on the water temperature fluctuation curve is used as the second water temperature change factor for the corresponding water wash. The preset temperature threshold range can be set by the implementer according to specific circumstances and is not specifically limited here.

[0097] The third step is to perform a fusion analysis on the first and second water temperature change factors of the same water wash to obtain the normal degree of constant temperature control for each water wash within the reference water wash stage.

[0098] Here, the degree of normal temperature control is negatively correlated with both the first and second water temperature change factors. The negative correlation means that the larger the first and second water temperature change factors are, the lower the degree of normal temperature control.

[0099] In one embodiment, the formula for calculating the normality of temperature control during the r-th wash within the j-th reference wash stage can be:

[0100] In the formula, ρ j,r This represents the degree of normality of temperature control during the r-th wash within the j-th reference wash stage. exp represents an exponential function with the natural constant e as its base. exp(-) is used to normalize the data to account for negative correlations. jr H represents the average of all slope values ​​on the water temperature fluctuation curve of the r-th wash within the j-th reference wash stage, i.e., the first water temperature variation factor. jr This represents the number of temperatures exceeding the preset temperature threshold range on the water temperature fluctuation curve of the r-th wash within the j-th reference wash stage, and H represents the total number of temperatures on the water temperature fluctuation curve of the r-th wash within the j-th reference wash stage. The second water temperature variation factor represents the ratio of the number of temperatures exceeding the preset temperature threshold range to the total number of temperatures on the water temperature change fluctuation curve of the r-th water wash within the j-th reference water wash stage.

[0101] In the formula for calculating the normality of constant temperature control, the smaller the first water temperature change factor and the second water temperature change factor, the more stable the temperature fluctuation is during the r-th water wash in the j-th reference water wash stage, and the greater the normality of constant temperature control during the r-th water wash in the j-th reference water wash stage.

[0102] It should be noted that the first water temperature change factor provides the macroscopic trend direction, indicating long-term stability, while the second water temperature change factor reveals the microscopic direction of sudden changes, indicating short-term instability. For example, if the average slope is positive but outliers surge, it may indicate an impending trend reversal, suggesting a lower degree of normal temperature control; conversely, if the average slope is negative but outliers are few, it indicates that the water temperature change fluctuation curve is in a low-fluctuation, stable state, suggesting a higher degree of normal temperature control.

[0103] Referring to the process for determining the normality of temperature control during the r-th wash within the j-th reference wash stage, the normality of temperature control for each wash within the j-th reference wash stage can be obtained.

[0104] S33. Based on the changing trend of the normality of constant temperature control during the reference water washing stage, and combined with the number of water washings in the reference water washing stage, determine the effectiveness index of constant temperature control during the reference water washing stage.

[0105] As an exemplary implementation, the effectiveness indicators for temperature control during the reference washing stage are determined, including:

[0106] The first step is to sort the multiple washes in the reference wash stage according to their order, thus obtaining the sorted washes in the reference wash stage.

[0107] In one embodiment, the time of each wash within a reference washing stage is obtained, and the multiple washes within the reference washing stage are sorted according to the order of the wash times to obtain the sorted washes within the reference washing stage.

[0108] The second step is to calculate the difference between the normal temperature control of the previous and subsequent water washes after sorting, and determine the first effectiveness factor when performing temperature control in the reference water wash stage based on the differences corresponding to each stage.

[0109] In one embodiment, during the reference water washing stage, as multiple water washing processes are carried out, the degree of normality of temperature control in the later water washing should be greater than that in the previous water washing. In other words, the temperature control in the reference water washing stage should get better and better. Therefore, the larger the difference between the various values ​​corresponding to the reference water washing stage, the stronger the effectiveness of temperature control in the reference water washing stage.

[0110] In one embodiment, the formula for calculating the first effectiveness factor during constant temperature control in the j-th reference washing stage can be:

[0111] In the formula, σ1 j The first effectiveness factor is represented when the j-th reference water washing stage is subjected to constant temperature control, norm represents the linear normalization function, R represents the number of water washings in the j-th reference water washing stage, r represents the sorted water washing sequence number, and ρ represents the first effectiveness factor when the j-th reference water washing stage is subjected to constant temperature control. j,r ρ represents the degree of normality of temperature control in the r-th wash after sorting within the j-th reference wash stage. j,(r-1) This indicates the degree of normal temperature control during the (r-1)th wash after sorting within the j-th reference wash stage.

[0112] Of course, the first effectiveness factor can also be obtained by determining the average slope of the j-th reference water washing stage based on the normality of constant temperature control in each water washing stage within the j-th reference water washing stage. No specific limitation is made here.

[0113] The third step is to perform negative correlation processing on the number of washes in the reference wash stage to determine the second effectiveness factor when the reference wash stage is subjected to constant temperature control.

[0114] In one embodiment, each additional water wash indicates a worse effect of the previous water wash, and the more water washes performed, the worse the effectiveness of temperature control during the reference water wash stage. Therefore, the reciprocal of the number of water washes in the reference water wash stage can be determined as the second effectiveness factor for temperature control during the reference water wash stage.

[0115] The fourth step is to perform a fusion analysis on the first and second effectiveness factors when the reference water washing stage is subjected to constant temperature control, and obtain the effectiveness index of the reference water washing stage when the temperature is controlled.

[0116] Here, both the first and second effectiveness factors are positively correlated with the effectiveness index. Positive correlation means that the larger the first and second effectiveness factors are, the larger the effectiveness index is.

[0117] In one embodiment, the product of the first effectiveness factor and the second effectiveness factor during constant temperature control in the reference water washing stage is calculated and used as an effectiveness index during constant temperature control in the reference water washing stage.

[0118] It should be noted that the larger the first effectiveness factor, the more it indicates that the normality of temperature control during the reference water wash stage is on the rise, and the stronger the effectiveness of temperature control during the reference water wash stage; the larger the second effectiveness factor, the less water washing is performed during the reference water wash stage, the better the temperature control during the corresponding reference water wash stage, and the greater the effectiveness index of temperature control during the reference water wash stage.

[0119] Referring to the process of obtaining the effectiveness index for constant temperature control during the j-th reference water washing stage, the effectiveness index for constant temperature control during each reference water washing stage can be obtained.

[0120] S4. Using the reference value index and effectiveness index of each reference washing stage, adjust the preset temperature range of the current washing stage corresponding to the reference washing stage to obtain the temperature adjustment range of each current washing stage.

[0121] Here, the temperature adjustment range is determined based on the temperature control situation of the reference water washing stage (i.e., reference value index and effectiveness index). It can effectively overcome the defect of existing water washing and drying temperature control that cannot predict temperature control failure in real time, avoid waiting for an abnormality to occur before starting rework or multiple water washing processes, and help ensure the thickness of the plated surface or the adhesion of the electroplated layer.

[0122] As an exemplary implementation, step S4 described above can be achieved through... Figure 4 The steps shown are to be implemented as follows:

[0123] S41, perform a fusion analysis on the reference value indicators and effectiveness indicators of the same reference washing stage to obtain the temperature correction coefficient for each reference washing stage.

[0124] Here, the temperature correction coefficient can characterize the degree of influence of different reference washing stages on the constant temperature control of the current washing stage, and its value ranges from 0 to 1.

[0125] As an exemplary implementation, the temperature correction factor for each reference washing stage is obtained, including:

[0126] The first step is to calculate the product of the reference value index and the effectiveness index for each reference washing stage, which will be used as the degree of temperature correction for the reference washing stage.

[0127] Here, for the j-th reference water wash stage of the m-th historical cadmium electroplating process, the greater the reference value index of each temperature control parameter when the j-th reference water wash stage is subjected to constant temperature control, and the greater the effectiveness index when the j-th reference water wash stage is subjected to constant temperature control, the stronger the reference value of the constant temperature control situation of the j-th reference water wash stage of the m-th historical cadmium electroplating process.

[0128] The second step is to normalize the temperature correction degree of the reference washing stage to obtain the temperature correction coefficient of the reference washing stage.

[0129] In one embodiment, the average temperature correction level of the j-th reference water rinse stage in M ​​historical cadmium electroplating processes is calculated. The temperature correction level of the j-th reference water rinse stage is then normalized using this average temperature correction level, and its expression can be: τ m,j τ represents the degree of temperature correction during the j-th reference water washing stage in the m-th historical cadmium electroplating process. M,j Let represent the average temperature correction level of the j-th reference water washing stage in M ​​historical cadmium electroplating processes, and obtain the temperature correction coefficient of the j-th reference water washing stage.

[0130] S42, using the temperature correction coefficient of each reference water washing stage, the upper limit temperature threshold of the reference water washing stage corresponding to the current water washing stage in different historical cadmium electroplating processes is weighted and summed to obtain the upper limit temperature value of the temperature adjustment range of each current water washing stage.

[0131] In one embodiment, the formula for calculating the upper temperature limit of the temperature adjustment range for the j-th current washing stage can be:

[0132] In the formula, v′1 represents the upper limit of the temperature adjustment range for the j-th current water washing stage, M represents the number of historical cadmium electroplating processes, m represents the sequence number of the historical cadmium electroplating process, and τ m,j τ represents the degree of temperature correction during the j-th reference water washing stage in the m-th historical cadmium electroplating process. M,j This represents the average temperature correction level for the j-th reference water wash stage in M ​​historical cadmium electroplating processes. v represents the temperature correction factor for the j-th reference water washing stage in the m-th historical cadmium electroplating process. 1,m,jThis represents the upper temperature limit threshold for the j-th reference water washing stage in the m-th historical cadmium electroplating process.

[0133] S43. Similarly, the lower limit threshold of the temperature range of each current water washing stage is obtained by weighted summation of the reference water washing stage thresholds corresponding to the current water washing stage in different historical cadmium electroplating processes.

[0134] In one embodiment, the formula for calculating the lower limit of the temperature adjustment range for the j-th current washing stage can be:

[0135] In the formula, v′2 represents the lower limit of the temperature adjustment range for the j-th current water washing stage, M represents the number of historical cadmium electroplating processes, m represents the sequence number of the historical cadmium electroplating process, and τ m,j τ represents the degree of temperature correction during the j-th reference water washing stage in the m-th historical cadmium electroplating process. M,j This represents the average temperature correction level for the j-th reference water wash stage in M ​​historical cadmium electroplating processes. v represents the temperature correction factor for the j-th reference water washing stage in the m-th historical cadmium electroplating process. 2,m,j This represents the lower limit threshold temperature of the j-th reference water washing stage in the m-th historical cadmium electroplating process.

[0136] The temperature adjustment range for the j-th current washing stage can be obtained by using the upper and lower temperature limits of the temperature adjustment range for the j-th current washing stage, which is [v′1, v′2].

[0137] By referring to the process of obtaining the temperature adjustment range of the j-th current water washing stage, the temperature adjustment range of each current water washing stage in the cadmium plating production line can be obtained.

[0138] S5 determines the temperature adjustment range of the current drying stage based on the drying temperature and reshaping number of each reference drying stage, and then combines the temperature adjustment range of each current water washing stage to perform constant temperature control of water washing and drying in the cadmium plating production line.

[0139] As an exemplary implementation, the temperature adjustment range for the current drying stage is determined based on the drying temperature and reshaping number of each reference drying stage, including:

[0140] The first step is to determine the reference drying stage as an abnormal drying stage if the number of reshaping cycles in the reference drying stage is greater than the preset number of cycles; otherwise, the reference drying stage is determined as a normal drying stage.

[0141] Here, the final processing stage of a cadmium plating production line is generally the drying stage. For the reference drying stages of M historical cadmium plating processes, they are first divided into abnormal drying stages and normal drying stages.

[0142] In one embodiment, the real-time temperature of the drying stage is obtained through thermocouples inside the drying equipment and transmitted to the temperature control system during the drying process. In actual production processes, incomplete or excessive drying may cause blistering or embrittlement of the coating, requiring stripping and replating. Therefore, it is necessary to record whether replating occurs during the drying process and the number of times replating is performed.

[0143] In one embodiment, the preset number of reshaping cycles is empirically set to 2. Reference drying stages with more than 2 reshaping cycles are designated as abnormal drying stages, indicating an anomaly in the drying temperature setting during the drying process. Reference drying stages with fewer than or equal to 2 reshaping cycles are designated as normal drying stages. The preset number of reshaping cycles can be set by the implementer based on specific circumstances and is not specifically limited.

[0144] The second step is to record the average drying temperature of all abnormal drying stages as the first temperature threshold, and the average drying temperature of all normal drying stages as the second temperature threshold.

[0145] In one embodiment, the drying temperature of each abnormal drying stage is obtained, where the drying temperature is the average of the drying temperature at each moment in the drying stage, and the average of the drying temperatures of all abnormal drying stages is used as a first temperature threshold; the drying temperature of each normal drying stage is obtained, and the average of the drying temperatures of all normal drying stages is used as a second temperature threshold.

[0146] The third step is to determine the temperature adjustment range for the current drying stage based on the first and second temperature thresholds.

[0147] As an exemplary implementation, determining the temperature adjustment range for the current drying stage includes:

[0148] The first sub-step is to calculate the difference between the first temperature threshold and the second temperature threshold, which is used as the temperature adjustment value.

[0149] In one embodiment, the absolute value of the difference between the first temperature threshold and the second temperature threshold is used as the temperature adjustment value, which is expressed as |T1-T2|, where T1 represents the first temperature threshold, T2 represents the second temperature threshold, and |T1-T2| represents taking the absolute value of T1-T2.

[0150] The second sub-step is to use the difference between the second temperature threshold and the temperature adjustment value as the upper limit of the temperature adjustment range for the current drying stage.

[0151] The third sub-step involves adding the second temperature threshold and the temperature adjustment value to obtain the lower limit of the temperature adjustment range for the current drying stage.

[0152] As an exemplary implementation, the cadmium plating production line performs constant temperature control for the washing and drying process based on the temperature adjustment range of the current drying stage and in conjunction with the temperature adjustment range of each current washing stage, including:

[0153] First, based on the temperature adjustment range of each current washing stage, the process of each stage is completed according to the actual process. After completing the process of each current washing stage, the current drying stage begins. First, the temperature adjustment range of the current drying stage is determined, and the process of the current drying stage is also completed according to the actual process. That is, the overall temperature of the drying environment of the plated parts is fluctuated within the temperature adjustment range of the current drying stage through a PID controller. Then, after completing the current drying stage, the management personnel check the drying effect and record the cadmium plating quality score of the plated parts. Plated parts that meet the rules are registered and put into storage, and plated parts that do not meet the rules are replated or destroyed according to the actual situation.

[0154] It should be noted that by using the relevant data on the water washing and drying constant temperature control of historical plated parts with the same attributes, the temperature adjustment range of each water washing stage and drying stage can be adaptively determined. Then, the water washing and drying constant temperature control of the cadmium plating production line can be carried out based on the temperature adjustment range. This can avoid relying on the operator's experience and is suitable for adapting to different types of plated parts or water quality conditions, which is conducive to improving the rationality of the control of water washing and drying temperature.

[0155] The above-described embodiments are only used to illustrate the technical solutions of the present invention, and are not intended to limit it. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention, and should all be included within the protection scope of the present invention.

Claims

1. A method for controlling the constant temperature of water washing and drying in a cadmium plating production line, characterized in that, Includes the following steps: Obtain several reference washing stages and several reference drying stages corresponding to each current washing stage in the current washing and drying process of the cadmium plating production line. Based on the number of remodeling cycles and the cadmium plating quality score corresponding to several historical cadmium plating processes, the reference value index of various temperature control parameters is determined when constant temperature control is performed in each of the reference water washing stages in each historical cadmium plating process. Based on the fluctuation of the water temperature change fluctuation curve in each water wash within each reference water wash stage, and combined with the number of water washes in each reference water wash stage, the effectiveness index of constant temperature control in each reference water wash stage is determined. Using the reference value index and the effectiveness index of each reference washing stage, the preset temperature range of the current washing stage corresponding to the reference washing stage is adjusted to obtain the temperature adjustment range of each current washing stage. Based on the drying temperature and reshaping number of each reference drying stage, the temperature adjustment range of the current drying stage is determined, and then combined with the temperature adjustment range of each current water washing stage, the water washing and drying constant temperature control of the cadmium plating production line is carried out.

2. The method for controlling the constant temperature of water washing and drying in a cadmium plating production line according to claim 1, characterized in that, The acquisition of several reference washing stages and several reference drying stages corresponding to each current washing stage in the current washing and drying process of the cadmium plating production line includes: Obtain the plated part quality parameter values ​​of the preceding operation modules of the current candidate stage, and obtain the plated part quality parameter values ​​of the preceding operation modules of several historical candidate stages corresponding to the current candidate stage during the historical water washing and drying process. By analyzing the differences in the plated part quality parameter values ​​between the current candidate stage and several historical candidate stages, several reference candidate stages are selected corresponding to the current candidate stage; wherein, the candidate stages are the washing stage and the drying stage.

3. The method for controlling the constant temperature of water washing and drying in a cadmium plating production line according to claim 1, characterized in that, The reference value indicators for determining the various temperature control parameters during the constant temperature control of each reference water washing stage in each historical cadmium electroplating process include: The number of replating operations caused by water washing during several historical cadmium electroplating processes was obtained, along with the total number of re-plating operations and the cadmium electroplating quality score during several historical cadmium electroplating processes. For each historical cadmium electroplating process, based on the ratio of the number of replating times caused by water washing to the total number of re-plating times, the total number of re-plating times, and the cadmium electroplating quality score, the reference value indicators of various temperature control parameters when performing constant temperature control in each reference water washing stage of the historical cadmium electroplating process are determined.

4. The method for controlling the constant temperature of water washing and drying in a cadmium plating production line according to claim 3, characterized in that, The reference value indicators for determining historical cadmium electroplating processes include: Calculate the negative correlation between the ratio and the total number of remodeling operations, and use the fusion result of the two negative correlation values ​​as the reference weight for the electroplated cadmium quality score; After weighting the electroplated cadmium quality score using the reference weights, normalization is performed to obtain a reference value index for historical water washing.

5. The method for controlling the constant temperature of water washing and drying in a cadmium plating production line according to claim 1, characterized in that, The effectiveness indicators for determining the temperature control during each reference washing stage include: For each reference water washing stage, obtain the water temperature change fluctuation curve for each water washing within the reference water washing stage; Based on the fluctuation of the water temperature change curve for each wash, determine the normality of constant temperature control for each wash within the reference wash stage. Based on the changing trend of the normality of temperature control during the reference water washing stage, and in combination with the number of water washings in the reference water washing stage, the effectiveness index of temperature control during the reference water washing stage is determined.

6. The method for controlling the constant temperature of water washing and drying in a cadmium plating production line according to claim 5, characterized in that, Determining the normality of temperature control for each wash during the reference washing stage includes: The first water temperature change factor for each water wash is determined based on the slope value of each data point on the water temperature change fluctuation curve for each water wash. The second water temperature change factor for each water wash is determined based on the number of temperatures exceeding the preset temperature threshold range on the water temperature change fluctuation curve for each water wash. By performing a fusion analysis on the first and second water temperature change factors of the same water wash, the normality of constant temperature control for each water wash within the reference water wash stage can be obtained. The degree of normal temperature control is negatively correlated with both the first water temperature change factor and the second water temperature change factor.

7. The method for controlling the constant temperature of water washing and drying in a cadmium plating production line according to claim 6, characterized in that, The effectiveness indicators for determining the reference water washing stage during constant temperature control include: The multiple washes within the reference wash stage are sorted according to their chronological order to obtain the sorted washes within the reference wash stage. Calculate the difference between the normality of the constant temperature control of the previous and subsequent water washes after sorting, and determine the first effectiveness factor when the constant temperature control is performed in the reference water wash stage based on each of the differences corresponding to the reference water wash stage. The number of washes in the reference wash stage is negatively correlated to determine the second effectiveness factor when the reference wash stage is under constant temperature control. The first effectiveness factor and the second effectiveness factor are fused and analyzed when the reference water washing stage is subjected to constant temperature control to obtain the effectiveness index of the reference water washing stage is subjected to constant temperature control.

8. The method for controlling the constant temperature of water washing and drying in a cadmium plating production line according to claim 1, characterized in that, The process of obtaining the temperature adjustment range for each current washing stage includes: A fusion analysis is performed on the reference value index and the effectiveness index for the same reference washing stage to obtain the temperature correction coefficient for each reference washing stage; Using the temperature correction coefficient for each reference washing stage, the upper limit temperature threshold of the reference washing stage corresponding to the current washing stage in different historical cadmium electroplating processes is weighted and summed to obtain the upper limit temperature value of the temperature adjustment range for each current washing stage. Similarly, the lower limit threshold of the temperature range for each current cadmium plating stage is obtained by weighted summation of the reference rinsing stages corresponding to different historical cadmium plating processes.

9. The method for controlling the constant temperature of water washing and drying in a cadmium plating production line according to claim 1, characterized in that, Determining the temperature adjustment range for the current drying stage includes: If the number of reshaping cycles in the reference drying stage is greater than the preset number, the reference drying stage is determined to be an abnormal drying stage; otherwise, the reference drying stage is determined to be a normal drying stage. The average drying temperature of all abnormal drying stages is recorded as the first temperature threshold, and the average drying temperature of all normal drying stages is recorded as the second temperature threshold. The temperature adjustment range for the current drying stage is determined based on the first temperature threshold and the second temperature threshold.

10. The method for controlling the constant temperature of water washing and drying in a cadmium plating production line according to claim 9, characterized in that, The step of determining the temperature adjustment range for the current drying stage based on the first temperature threshold and the second temperature threshold includes: Calculate the difference between the first temperature threshold and the second temperature threshold, and use it as the temperature adjustment value; The difference between the second temperature threshold and the temperature adjustment value is used as the upper limit of the temperature adjustment range for the current drying stage; The value obtained by adding the second temperature threshold and the temperature adjustment value is used as the lower limit of the temperature adjustment range for the current drying stage.

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