A water washing and drying constant temperature control method for a cadmium plating production line

Abstract

The present application relates to the technical field of temperature control, and particularly relates to a water washing and drying constant temperature control method for a cadmium plating production line, which comprises the following steps: obtaining a plurality of reference water washing stages and a plurality of reference drying stages, determining reference value indexes according to the remodeling times and the electroplating cadmium quality scores corresponding to a plurality of historical electroplating cadmium processes; determining effectiveness indexes according to the water temperature change fluctuation curves of each water washing in each reference water washing stage and in combination with the water washing times of each reference water washing stage; adjusting the reference value indexes and the effectiveness indexes of each reference water washing stage to obtain temperature adjustment ranges of each current water washing stage; and performing water washing and drying constant temperature control of the cadmium plating production line according to the temperature adjustment ranges of each current water washing stage and a current drying stage. The present application adjusts the temperature of the current cadmium plating production line through the constant temperature control of the excellent conditions of each reference water washing stage and reference drying stage, and effectively improves the control rationality of the water washing and drying temperature.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of temperature control, and particularly relates to a water washing and drying constant temperature control method for a cadmium plating production line. BACKGROUND

[0002] The cadmium plating process is a technology of forming a cadmium plating layer on the surface of a metal through electrochemical deposition, which is widely used in the fields of aerospace, automobiles, electronics, etc., to improve the corrosion resistance and electrical conductivity of materials. In the cadmium plating production line, the water washing and drying link is a key process for ensuring the quality of the plating layer, and its core goal is to remove the residual chemicals on the surface and prevent secondary pollution, while optimizing the drying efficiency and plating layer performance through constant temperature control.

[0003] The existing water washing and drying temperature control cannot predict temperature control failure in real time, and needs to wait for abnormality (such as temperature exceeding the standard) to start rework processing or multiple water washing processing, which will affect the thickness of the surface of the plated part or the adhesion of the electroplated layer. Moreover, the existing temperature control relies on the experience of operators, and it is difficult to adapt to various types of plated parts or water quality conditions, and the control rationality of the water washing and drying temperature is low. SUMMARY

[0004] In order to solve the above technical problem of low rationality of the existing water washing and drying temperature control, the purpose of the present application is to provide a water washing and drying constant temperature control method for a cadmium plating production line, and the technical solution adopted is as follows:

[0005] One embodiment of the present application provides a water washing and drying constant temperature control method for a cadmium plating production line, which comprises the following steps:

[0006] Obtaining a plurality of reference water washing stages corresponding to each current water washing stage in the current water washing and drying process of the cadmium plating production line, and a plurality of reference drying stages corresponding to the current drying stage;

[0007] According to the number of times of remodeling and the electroplated cadmium quality score corresponding to a plurality of historical electroplated cadmium processes, determining the reference value index of each temperature control parameter when each reference water washing stage in each historical electroplated cadmium process is controlled at a constant temperature;

[0008] According to the fluctuation of the water temperature change fluctuation curve of each water washing in each reference water washing stage, and in combination with the number of water washings of each reference water washing stage, determining the effectiveness index when each reference water washing stage is controlled at a constant temperature;

[0009] Adjusting the preset temperature range of the current water washing stage corresponding to the reference water washing stage by using the reference value index and the effectiveness index of each reference water washing stage, to obtain the temperature adjustment range of each current water washing stage;

[0010] According to the drying temperature and the number of re-plating of each reference drying stage, a 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 performed.

[0011] Further, the acquisition of the cadmium plating production line in each current water washing stage corresponding to a plurality of reference water washing stages, the current drying stage corresponding to a plurality of reference drying stages in the current water washing and drying process comprises:

[0012] The plating quality parameter value of the previous operation module of the current candidate stage is acquired, and the plating quality parameter value of the previous operation module of the historical candidate stage corresponding to the current candidate stage in a plurality of historical water washing and drying processes is acquired.

[0013] By the difference of the plating quality parameter value between the current candidate stage and a plurality of historical candidate stages, a plurality of reference candidate stages corresponding to the current candidate stage are screened out; wherein, the candidate stage is a water washing stage and a drying stage.

[0014] Further, the determination of the reference value index of each temperature control parameter when each reference water washing stage is controlled at a constant temperature in each historical electroplating cadmium process comprises:

[0015] The number of re-plating caused by water washing in a plurality of historical electroplating cadmium processes is acquired, and the total number of re-plating and the electroplating cadmium quality score in a plurality of historical electroplating cadmium processes are acquired.

[0016] According to the ratio of the number of re-plating caused by water washing to the total number of re-plating, the total number of re-plating and the electroplating cadmium quality score corresponding to each historical electroplating cadmium process, the reference value index of each temperature control parameter when each reference water washing stage is controlled at a constant temperature in the historical electroplating cadmium process is determined.

[0017] Further, the determination of the reference value index of the historical electroplating cadmium process comprises:

[0018] The negative correlation value of the ratio and the total number of re-plating is calculated, and the fusion result of the two negative correlation values is taken as the reference weight of the electroplating cadmium quality score.

[0019] After the electroplating cadmium quality score is weighted by using the reference weight, normalization processing is performed to obtain the reference value index of the historical water washing.

[0020] Further, the determination of the effectiveness index when each reference water washing stage is controlled at a constant temperature comprises:

[0021] Obtaining a water temperature change fluctuation curve of each water washing in the reference water washing stage according to the water temperature change fluctuation curve of each water washing in the reference water washing stage;

[0022] Determining a constant temperature control normality of each water washing in the reference water washing stage according to the fluctuation of the water temperature change fluctuation curve of each water washing;

[0023] Determining an effectiveness index of the reference water washing stage in constant temperature control according to the change trend of the constant temperature control normality in the reference water washing stage and the number of water washings in the reference water washing stage.

[0024] Further, the determination of the constant temperature control normality of each water washing in the reference water washing stage comprises:

[0025] Determining a first water temperature change factor of each water washing according to the slope value of each data point on the water temperature change fluctuation curve of each water washing;

[0026] Determining a second water temperature change factor of each water washing according to the number of temperatures exceeding the preset temperature threshold range on the water temperature change fluctuation curve of each water washing;

[0027] Fusing and analyzing the first water temperature change factor and the second water temperature change factor of the same water washing to obtain the constant temperature control normality of each water washing in the reference water washing stage;

[0028] The constant temperature control normality is negatively correlated with the first water temperature change factor and the second water temperature change factor.

[0029] Further, the determination of the effectiveness index of the reference water washing stage in constant temperature control comprises:

[0030] Sorting the multiple water washings in the reference water washing stage according to the sequence to obtain the sorted water washings in the reference water washing stage;

[0031] Calculating the difference between the constant temperature control normality of the previous water washing and the constant temperature control normality of the subsequent water washing, and determining a first effectiveness factor of the reference water washing stage in constant temperature control according to each difference corresponding to the reference water washing stage;

[0032] Negatively processing the number of water washings in the reference water washing stage to determine a second effectiveness factor of the reference water washing stage in constant temperature control;

[0033] Fusing and analyzing the first effectiveness factor and the second effectiveness factor of the reference water washing stage in constant temperature control to obtain the effectiveness index of the reference water washing stage in constant temperature control.

[0034] Further, the obtaining of the temperature adjustment range of each current water washing stage comprises:

[0035] Conducting a fusion analysis on the reference value index and the effectiveness index of the same reference water washing stage to obtain a temperature correction coefficient of each reference water washing stage;

[0036] Using the temperature correction coefficient of each reference water washing stage, performing a weighted summation processing on the temperature upper limit threshold of the reference water washing stage corresponding to the current water washing stage in different historical electroplating cadmium processes to obtain a temperature upper limit value of the temperature adjustment range of each current water washing stage;

[0037] Similarly, performing a weighted summation processing on the temperature lower limit threshold of the reference water washing stage corresponding to the current water washing stage in different historical electroplating cadmium processes to obtain a temperature lower limit value of the temperature adjustment range of each current water washing stage.

[0038] Further, the determination of the temperature adjustment range of the current drying stage comprises:

[0039] If the number of remodeling of the reference drying stage is greater than the preset number, the reference drying stage is determined as an abnormal drying stage, otherwise the reference drying stage is determined as a normal drying stage;

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

[0041] According to the first temperature threshold value and the second temperature threshold value, a temperature adjustment range of the current drying stage is determined.

[0042] Further, the determination of the temperature adjustment range of the current drying stage according to the first temperature threshold value and the second temperature threshold value comprises:

[0043] A difference value between the first temperature threshold value and the second temperature threshold value is calculated as a temperature adjustment value;

[0044] A difference value between the second temperature threshold value and the temperature adjustment value is taken as a temperature upper limit value of the temperature adjustment range of the current drying stage;

[0045] A value obtained by adding the second temperature threshold value and the temperature adjustment value is taken as a temperature lower limit value of the temperature adjustment range of the current drying stage.

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

[0047] The application provides a water washing and drying constant temperature control method for a cadmium plating production line. BRIEF DESCRIPTION OF DRAWINGS

[0048] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, and the advantages thereof, a brief introduction will be given to the drawings needed in the embodiments or the prior art description. Obviously, the drawings in the following description are only some embodiments of the present application, and for those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0049] Figure 1 A flow chart of the water washing and drying constant temperature control method for the cadmium plating production line is provided for an embodiment of the present application.

[0050] Figure 2 An implementation flow chart of step S2 in the embodiment of the present application is provided.

[0051] Figure 3 An implementation flow chart of step S3 in the embodiment of the present application is provided.

[0052] Figure 4 An implementation flow chart of step S4 in the embodiment of the present application is provided. DETAILED DESCRIPTION

[0053] In order to further clarify the technical means and effects taken by the present application to achieve the predetermined inventive purpose, the specific implementation, structure, features and effects of the technical solutions proposed according to the present application are described in detail below in combination with the drawings and preferred embodiments. In the following description, different "one embodiment" or "another embodiment" do not necessarily refer to the same embodiment. In addition, the 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 application belongs.

[0055] The application scenario to which the present application is directed can be:

[0056] The residual impurity components that need to be cleaned each time the water is washed are different, so the water body temperature required for each water washing stage is different. The existing water washing and drying process does not consider the historical temperature control effect, when the temperature control of the water washing stage or the drying stage is abnormal, rework processing or multiple water washing processing may be performed, which will affect the surface thickness of the plated part or the adhesion of the electroplated layer, and it is difficult to adapt to various plated part types or water quality conditions, therefore, more reasonable control of temperature control is needed in the water washing and drying process.

[0057] One embodiment of the present application provides a water washing and drying constant temperature control method for a cadmium plating production line, as shown in Figure 1 The method comprises the following steps:

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

[0059] Here, the reference water washing stage is a historical water washing stage corresponding to the current water washing stage and similar in quality to the plated part, and the reference drying stage is a historical drying stage corresponding to the current drying stage and similar in quality to the plated part. The quality of the plated part is represented by a plated part quality parameter value, such as the average plated layer thickness.

[0060] As an exemplary embodiment, the reference water washing stage and the reference drying stage are obtained in the same way, in order to avoid repeated description of the same obtaining method, the water washing stage and the drying stage are collectively referred to as a candidate stage, and a plurality of reference candidate stages corresponding to the current candidate stage are obtained, including:

[0061] First, obtain the plated part quality parameter value of the previous operation module of the current candidate stage, and obtain the plated part quality parameter value of the previous operation module of the historical candidate stage corresponding to the current candidate stage in the plurality of historical water washing and drying processes.

[0062] Here, the different electroplating cadmium process needs to go through the drying stage and multiple water washing stages, and the temperature control is realized by electric heater and PID controller during the water washing and drying process.

[0063] In one embodiment, the properties of the plated material are different, and the corresponding electroplating cadmium process is also different. The historical water washing and drying process and the current water washing and drying process belong to the same type of electroplating cadmium process of the plated material, such as carbon steel material electroplating cadmium process and copper alloy material electroplating cadmium process. The electroplating cadmium process includes multiple different water washing stages.

[0064] In one embodiment, the processing mode of the pre-operation module of each water washing stage is different, but the quantification mode of the corresponding plated material quality parameter value can be the same. For example, in the electroplating cadmium process, the average coating thickness of a single batch of plated material is recorded by the X-ray fluorescence thickness instrument after the electroplating cadmium process. All plated material quality parameter values are standardized parameter values, i.e. the value range is between 0 and 1.

[0065] Secondly, the current candidate stage and several historical candidate stages are filtered out according to the difference of the plated material quality parameter value between the current candidate stage and the several historical candidate stages.

[0066] In one embodiment, the absolute value of the difference of the plated material quality parameter value between the current candidate stage and each historical candidate stage is calculated, and the historical candidate stage with a difference absolute value less than a preset difference value is taken 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 the specific actual situation.

[0067] Referring to the acquisition process of the several reference candidate stages corresponding to the current candidate stage, the several reference water washing stages corresponding to each current water washing stage and the several reference drying stages corresponding to the current drying stage can be obtained.

[0068] S2, according to the number of remodeling times and the electroplating cadmium quality score corresponding to the several historical electroplating cadmium processes, determining the reference value index of each temperature control parameter when each reference water washing stage is controlled at constant temperature in each historical electroplating cadmium process.

[0069] Here, the reference value index refers to the control effectiveness of each temperature control parameter when the historical electroplating cadmium process is controlled at constant temperature. The reference value indexes of the reference water washing stages belonging to the same historical electroplating cadmium process are the same in value.

[0070] As an exemplary embodiment, the above step S2 can be realized by the steps shown in the following table: Figure 2 ​

[0071] S21, obtain the number of times of re-plating due to water washing in a plurality of historical electroplating cadmium processes, and obtain the total number of times of re-shaping and the electroplating cadmium quality score in the plurality of historical electroplating cadmium processes.

[0072] Here, in the actual production process, the plated part may need to be re-plated or re-washed due to damage to the plating layer caused by the water washing process or poor adhesion and poor gloss of the plated part, and therefore the reference value of the temperature control parameter can be analyzed by analyzing the number of times of re-plating.

[0073] In one embodiment, the more the number of times of re-plating due to water washing, the worse the constant temperature control effect of the water washing stage, and therefore the number of times of re-plating due to water washing needs to be obtained.

[0074] In one embodiment, after completing the electroplating cadmium process, the electroplating cadmium quality score of the plated part is recorded when checking into the warehouse, for example, specifically divided into: first-class product 100 points, second-class product 90 points, and third-class product 80 points.

[0075] S22, for each historical electroplating cadmium process, according to the ratio of the number of times of re-plating due to water washing to the total number of times of re-shaping, the total number of times of re-shaping, and the electroplating cadmium quality score corresponding to the historical electroplating cadmium process, determine the reference value index of each temperature control parameter when constant temperature control is performed in each reference water washing stage in the historical electroplating cadmium process.

[0076] Here, the more the number of times of re-plating experienced in the historical electroplating cadmium process, and the more the number of times of re-plating due to water washing or drying, the worse the process rationality in the historical electroplating cadmium process; the greater the process rationality in the historical electroplating cadmium process, and the higher the electroplating cadmium quality score of the plated part recorded in the warehouse, the better the electroplating effect of the historical electroplating cadmium process, and the greater the reference value of each temperature control parameter when constant temperature control is performed in each reference water washing stage in the corresponding historical electroplating cadmium process, that is, the stronger the reference of each temperature control parameter.

[0077] As an exemplary embodiment, determining the reference value index of the historical electroplating cadmium process includes:

[0078] First, calculate the negative correlation value of the ratio and the total number of times of re-shaping, and take the fusion result of the two negative correlation values as the reference weight of the electroplating cadmium quality score.

[0079] In one embodiment, the calculation formula of the reference weight of the electroplating cadmium quality score of the mth historical electroplating cadmium process can be:

[0080] In the formula, α m represents the reference weight of the electroplating cadmium quality score of the mth historical electroplating cadmium process, Am represents the total number of remolding of the mth historical electroplating cadmium process, B m represents the number of re-plating due to water washing corresponding to the mth historical electroplating cadmium process, represents the ratio of the number of re-plating due to water washing corresponding to the mth historical electroplating cadmium process to the total number of remolding, represents the negative correlation value of the ratio, represents the negative correlation value of the total number of remolding, the total number of remolding A in the embodiment, m There is no possibility of being zero.

[0081] In the second step, the electroplating cadmium quality score is weighted by using the reference weight, and then normalized to obtain the reference value index of historical water washing.

[0082] In one embodiment, the calculation formula of the reference value index of the mth historical electroplating cadmium process can be:

[0083] θ m = norm (a m × V m ); in the formula, θ m represents the reference value index of the mth historical electroplating cadmium process, norm represents a linear normalization function, a m represents the reference weight of the electroplating cadmium quality score of the mth historical electroplating cadmium process, V m represents the electroplating cadmium quality score of the mth historical electroplating cadmium process.

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

[0085] S3, according to the fluctuation of the water temperature change fluctuation curve of each water washing in each reference water washing stage, and combining the number of water washings in each reference water washing stage, the effectiveness index when constant temperature control is performed in each reference water washing stage is determined.

[0086] Here, the effectiveness index refers to the importance degree of the constant temperature control of the water washing stage on the cleaning effect, the quality of the plated part, and the production stability, etc.

[0087] As an exemplary embodiment, the above step S3 can be implemented by the steps shown in the following table: Figure 3

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

[0089] ​In one embodiment, the water temperature value at each time point of each water washing in a reference water washing stage is acquired, and the water temperature value at each time point is curve-fitted by using a least square method to obtain a water temperature change fluctuation curve of each water washing. One reference water washing stage can include multiple water washing operations, and each water washing has a corresponding water temperature change fluctuation curve. The horizontal coordinate of the water temperature change fluctuation curve is time, and the vertical coordinate is water temperature.

[0090] In S32, the normal degree of constant temperature control of each water washing in the reference water washing stage is determined according to the fluctuation of the water temperature change fluctuation curve of each water washing.

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

[0092] As an exemplary embodiment, determining the normal degree of constant temperature control of each water washing in the reference water washing stage includes:

[0093] First, a first water temperature change factor of each water washing is determined according to the slope value of each data point on the water temperature change fluctuation curve of each water washing.

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

[0095] Second, a second water temperature change factor of each water washing is determined according to the number of temperatures exceeding a preset temperature threshold range on the water temperature change fluctuation curve of each water washing.

[0096] In one embodiment, the preset temperature threshold range is set to 50-60℃, exceeding the preset temperature threshold range means that the water temperature value is less than 50℃ or greater than 60℃, the number of temperatures exceeding the preset temperature threshold range on the water temperature change fluctuation curve is counted, and 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 is taken as the second water temperature change factor of the corresponding water washing. The preset temperature threshold range can be set by the implementer according to the specific actual situation, which is not limited here.

[0097] Third, the first water temperature change factor and the second water temperature change factor of the same water washing are fused and analyzed to obtain the normal degree of constant temperature control of each water washing in the reference water washing stage.

[0098] Here, the normal degree of constant temperature control is negatively correlated with the first water temperature change factor and the second water temperature change factor. The greater the first and second water temperature change factors, the smaller the normal degree of constant temperature control.

[0099] In one embodiment, the calculation formula of the constant temperature control normality of the rth water washing in the jth reference water washing stage can be:

[0100] In the formula, p j,r represents the constant temperature control normality of the rth water washing in the jth reference water washing stage, exp represents the exponential function with the natural constant e as the base, exp(-) is used to realize the normalization processing of the negative correlation of the data, l jr represents the average value of all slope values on the water temperature change fluctuation curve of the rth water washing in the jth reference water washing stage, that is, the first water temperature change factor, H jr represents the number of temperatures exceeding the preset temperature threshold range on the water temperature change fluctuation curve of the rth water washing in the jth reference water washing stage, H represents the total number of temperatures on the water temperature change fluctuation curve of the rth water washing in the jth reference water washing stage, 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 rth water washing in the jth reference water washing stage, that is, the second water temperature change factor.

[0101] In the calculation formula of the constant temperature control normality, the smaller the first water temperature change factor and the second water temperature change factor are, the more stable the temperature fluctuation is in the rth water washing in the jth reference water washing stage, and the greater the constant temperature control normality of the rth water washing in the jth reference water washing stage is.

[0102] It should be noted that the first water temperature change factor can provide a macro trend direction, that is, represent long-term stability, and the second water temperature change factor can reveal a micro mutation direction, that is, represent short-term instability. For example, if the average value of the slope is a positive number but the number of abnormal points increases sharply, it may indicate that the trend will reverse, and the smaller the constant temperature control normality is; if the average value of the slope is a negative number but the number of abnormal points is small, it indicates that the water temperature change fluctuation curve is in a low fluctuation stable state, and the greater the constant temperature control normality is.

[0103] Referring to the determination process of the constant temperature control normality of the rth water washing in the jth reference water washing stage described above, the constant temperature control normality of each water washing in the jth reference water washing stage can be obtained.

[0104] S33, according to the change trend of the constant temperature control normality in the reference water washing stage, and in combination with the number of water washings in the reference water washing stage, the effectiveness index of the constant temperature control in the reference water washing stage is determined.

[0105] As an exemplary embodiment, the effectiveness index of the constant temperature control in the reference water washing stage is determined, including:

[0106] Firstly, the multiple water washings in the reference water washing stage are sorted according to the sequence of the water washings, to obtain the sorted water washings in the reference water washing stage.

[0107] In one embodiment, the time of each water washing in the reference water washing stage is acquired, and the multiple water washings in the reference water washing stage are sorted according to the order of the water washing time to obtain each water washing in the reference water washing stage after sorting.

[0108] In the second step, the difference between the constant temperature control normality of the previous water washing and the next water washing after sorting is calculated, and the first effectiveness factor of the reference water washing stage when the constant temperature control is performed is determined according to each difference corresponding to the reference water washing stage.

[0109] In one embodiment, with the progress of the multiple water washings in the reference water washing stage, the constant temperature control normality of the next water washing should be greater than that of the previous water washing, that is, the constant temperature control corresponding to the reference water washing stage should be better and better, so the greater the each difference corresponding to the reference water washing stage, the stronger the effectiveness of the reference water washing stage when the constant temperature control is performed.

[0110] In one embodiment, the calculation formula of the first effectiveness factor of the jth reference water washing stage when the constant temperature control is performed can be:

[0111] In the formula, σ1 j represents the first effectiveness factor of the jth reference water washing stage when the constant temperature control is performed, norm represents a linear normalization function, R represents the number of water washings in the jth reference water washing stage, r represents the sorted water washing sequence number, and ρ j,r represents the constant temperature control normality of the rth water washing after sorting in the jth reference water washing stage, and ρ j,(r-1) represents the constant temperature control normality of the (r-1)th water washing after sorting in the jth reference water washing stage.

[0112] Of course, the first effectiveness factor can also be obtained through the slope mean corresponding to the jth reference water washing stage determined by the constant temperature control normality of each water washing in the jth reference water washing stage, which is not specifically limited here.

[0113] In the third step, the number of water washings in the reference water washing stage is negatively correlated, and the second effectiveness factor of the reference water washing stage when the constant temperature control is performed is determined.

[0114] In one embodiment, the more the water washings are performed, the worse the effect of the previous water washing is, the more the number of water washings is, and the worse the effectiveness of the reference water washing stage when the constant temperature control is performed is. Therefore, the reciprocal of the number of water washings in the reference water washing stage can be determined as the second effectiveness factor of the reference water washing stage when the constant temperature control is performed.

[0115] In the fourth step, the first effectiveness factor and the second effectiveness factor in the constant temperature control of the reference water washing stage are fused and analyzed to obtain the effectiveness index in the constant temperature control of the reference water washing stage.

[0116] Here, the first effectiveness factor and the second effectiveness factor are positively correlated with the effectiveness index, that is, the greater the first effectiveness factor and the second effectiveness factor, the greater the effectiveness index.

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

[0118] It should be noted that the greater the first effectiveness factor, the greater the normal degree of the constant temperature control in the reference water washing stage, and the stronger the effectiveness in the constant temperature control of the reference water washing stage; the greater the second effectiveness factor, the less the reference water washing stage is washed, the better the temperature control of the corresponding reference water washing stage, and the greater the effectiveness index in the constant temperature control of the reference water washing stage.

[0119] Referring to the above process of obtaining the effectiveness index in the constant temperature control of the jth reference water washing stage, the effectiveness index in the constant temperature control of each reference water washing stage can be obtained.

[0120] In S4, the preset temperature range of the current water washing stage corresponding to the reference water washing stage is adjusted by using the reference value index and the effectiveness index of each reference water washing stage to obtain the temperature adjustment range of each current water washing stage.

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

[0122] As an exemplary embodiment, the above step S4 can be implemented by the steps shown in FIG. 4. Figure 4

[0123] In S41, the reference value index and the effectiveness index of the same reference water washing stage are fused and analyzed to obtain the temperature correction coefficient of each reference water washing stage.

[0124] Here, the temperature correction coefficient can represent the influence degree of different reference water washing stages on the constant temperature control of the current water washing stage, and its value range is between 0 and 1.

[0125] ​As an exemplary embodiment, the temperature correction coefficient of each reference water washing stage is obtained, including:

[0126] In a first step, the product of the reference value index and the effectiveness index of each reference water washing stage is calculated as the temperature correction degree of the reference water washing stage, respectively for each reference water washing stage.

[0127] Here, for the jth reference water washing stage of the mth historical electroplating cadmium process, the greater the reference value index of each temperature control parameter when the jth reference water washing stage is controlled at a constant temperature, and the greater the effectiveness index when the jth reference water washing stage is controlled at a constant temperature, the stronger the reference of the constant temperature control of the jth reference water washing stage of the mth historical electroplating cadmium process.

[0128] In a second step, the temperature correction degree of the reference water washing stage is normalized to obtain the temperature correction coefficient of the reference water washing stage.

[0129] In an embodiment, the average value of the temperature correction degree of the jth reference water washing stage in M historical electroplating cadmium processes is calculated, and the average value of the temperature correction degree is used to normalize the temperature correction degree of the jth reference water washing stage, and the expression can be τ m,j , which represents the temperature correction degree of the jth reference water washing stage in the mth historical electroplating cadmium process, τ M,j , which represents the average value of the temperature correction degree of the jth reference water washing stage in M historical electroplating cadmium processes, to obtain the temperature correction coefficient of the jth reference water washing stage.

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

[0131] In an embodiment, the calculation formula of the temperature upper limit value of the temperature adjustment range of the jth current water washing stage can be:

[0132] In the formula, v'1 represents the temperature upper limit value of the temperature adjustment range of the jth current water washing stage, M represents the number of historical electroplating cadmium processes, m represents the serial number of the historical electroplating cadmium process, τ m,j , which represents the temperature correction degree of the jth reference water washing stage in the mth historical electroplating cadmium process, τ M,j , which represents the average value of the temperature correction degree of the jth reference water washing stage in M historical electroplating cadmium processes, , which represents the temperature correction coefficient of the jth reference water washing stage in the mth historical electroplating cadmium process, v 1,m,jv represents the temperature upper limit threshold of the jth reference water washing stage in the mth historical electroplating cadmium process.

[0133] S43, similarly, the temperature lower limit threshold of the reference water washing stage corresponding to the current water washing stage in different historical electroplating cadmium processes is processed by weighted summation to obtain the temperature lower limit value of the temperature adjustment range of each current water washing stage.

[0134] In one embodiment, the calculation formula of the temperature lower limit value of the temperature adjustment range of the jth current water washing stage can be:

[0135] In the formula, v'2 represents the temperature lower limit value of the temperature adjustment range of the jth current water washing stage, M represents the number of historical electroplating cadmium processes, m represents the serial number of the historical electroplating cadmium process, τ m,j v represents the temperature correction degree of the jth reference water washing stage in the mth historical electroplating cadmium process, τ M,j v represents the average value of the temperature correction degree of the jth reference water washing stage in the M historical electroplating cadmium processes, v represents the temperature correction coefficient of the jth reference water washing stage in the mth historical electroplating cadmium process, v 2,m,j v represents the temperature lower limit threshold of the jth reference water washing stage in the mth historical electroplating cadmium process.

[0136] Through the temperature upper limit value and the temperature lower limit value of the temperature adjustment range of the jth current water washing stage, the temperature adjustment range of the jth current water washing stage can be obtained, that is, [v'1, v'2].

[0137] Referring to the acquisition process of the temperature adjustment range of the jth current water washing stage, the temperature adjustment range of each current water washing stage in the current water washing process of the cadmium plating production line can be obtained.

[0138] S5, according to the drying temperature and the number of reshaping 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.

[0139] As an exemplary embodiment, according to the drying temperature and the number of reshaping of each reference drying stage, the temperature adjustment range of the current drying stage is determined, which includes:

[0140] First, if the number of reshaping of the reference drying stage is greater than the preset number, the reference drying stage is determined as an abnormal drying stage, otherwise the reference drying stage is determined as a normal drying stage.

[0141] Here, generally the last processing stage of the cadmium plating production line is the drying stage. For the reference drying stages of the M historical electroplating cadmium 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 by a thermocouple inside the drying equipment during the drying process and transmitted to the temperature control system. In actual production process, the plating layer may be blistering or brittle due to incomplete drying or over-drying, and re-plating is required after stripping. Therefore, whether re-plating occurs during the drying process is recorded, and the number of re-plating is recorded.

[0143] In one embodiment, the preset number is 2, the reference drying stage with a re-shaping number greater than 2 is recorded as an abnormal drying stage, and the abnormal drying stage indicates that the drying temperature setting in the drying process is abnormal. The reference drying stage with a re-shaping number less than or equal to 2 is recorded as a normal drying stage. The preset number can be set by the implementer according to the specific actual situation, and is not specifically limited.

[0144] Secondly, 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.

[0145] In one embodiment, the drying temperature of each abnormal drying stage is obtained, the drying temperature refers to the average value of the drying temperature at each time in the drying stage, and the average value of the drying temperature of all abnormal drying stages is taken as the first temperature threshold. The drying temperature of each normal drying stage is obtained, and the average value of the drying temperature of all normal drying stages is taken as the second temperature threshold.

[0146] Thirdly, the temperature adjustment range of the current drying stage is determined according to the first temperature threshold and the second temperature threshold.

[0147] As an exemplary embodiment, the temperature adjustment range of the current drying stage is determined, which includes:

[0148] Firstly, the difference value between the first temperature threshold and the second temperature threshold is calculated 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 taken as the temperature adjustment value, which is expressed as |T1-T2|, wherein T1 represents the first temperature threshold, T2 represents the second temperature threshold, and |T1-T2| represents taking the absolute value of T1-T2.

[0150] Secondly, the difference between the second temperature threshold and the temperature adjustment value is taken as the temperature upper limit value of the temperature adjustment range of the current drying stage.

[0151] Thirdly, the value obtained by adding the second temperature threshold and the temperature adjustment value is taken as the temperature lower limit value of the temperature adjustment range of the current drying stage.

[0152] As an exemplary embodiment, the water-washing and drying constant temperature control of the cadmium plating production line is performed according to the temperature adjustment range of the current drying stage in combination with the temperature adjustment range of each current water-washing stage, including:

[0153] First, the process of each stage is completed according to the actual process according to the temperature adjustment range of each current water-washing stage; after the process of each current water-washing stage is completed, the current drying stage is entered, the temperature adjustment range of the current drying stage is determined first, 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 part is fluctuated in the temperature adjustment range of the current drying stage through the PID controller; then after the current drying stage is completed, the management personnel detect the drying effect and record the electroplated cadmium quality score of the plated part, the plated part meeting the rules is registered and stored, and the plated part not meeting the rules is re-plated or destroyed according to the actual situation.

[0154] It should be noted that the temperature adjustment range of each water-washing stage and drying stage is adaptively determined through the water-washing and drying constant temperature control related data of the plated parts with the same attribute, and then the water-washing and drying constant temperature control of the cadmium plating production line is performed based on the temperature adjustment range, which can avoid relying on the experience of the operators and is suitable for adapting to various plated part types or water quality conditions, and is conducive to improving the rationality of the control of the water-washing and drying temperature.

[0155] The above-described embodiments are only used to illustrate the technical solutions of the present application, rather than limit them; although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that the technical solutions recorded in the foregoing embodiments can be modified, or some technical features can be replaced by equivalents; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application, and should be included in the protection scope of the present application.

Claims

1. A water washing and drying thermostatic control method for a cadmium plating line, characterized by, The method comprises the following steps: obtaining a plurality of reference washing stages corresponding to each current washing stage in the current washing and drying process of the cadmium plating production line and a plurality of reference drying stages corresponding to the current drying stage; determining a reference value index of each temperature control parameter when each reference washing stage is controlled at a constant temperature according to the number of remolding and the plating quality score of each historical cadmium plating process; determining an effectiveness index of each reference washing stage when the reference washing stage is controlled at a constant temperature according to the fluctuation of the water temperature change fluctuation curve of each washing in the reference washing stage and the number of washings in the reference washing stage; adjusting the preset temperature range of the current washing stage corresponding to the reference washing stage by using the reference value index and the effectiveness index of each reference washing stage to obtain a temperature adjustment range of each current washing stage; determining a temperature adjustment range of the current drying stage according to the drying temperature and the number of remolding of each reference drying stage, and then combining the temperature adjustment range of each current washing stage to control the washing and drying at a constant temperature of the cadmium plating production line; The determination of the effectiveness index of each reference washing stage when the reference washing stage is controlled at a constant temperature comprises: for each reference washing stage, obtaining a water temperature change fluctuation curve of each washing in the reference washing stage; determining the normal degree of constant temperature control of each washing in the reference washing stage according to the fluctuation of the water temperature change fluctuation curve of each washing; determining the effectiveness index of the reference washing stage when the reference washing stage is controlled at a constant temperature according to the change trend of the normal degree of constant temperature control and the number of washings in the reference washing stage; The determination of the normal degree of constant temperature control of each washing in the reference washing stage comprises: determining a first water temperature change factor of each washing according to the slope value of each data point on the water temperature change fluctuation curve of each washing; determining a second water temperature change factor of each washing according to the number of temperatures exceeding the preset temperature threshold range on the water temperature change fluctuation curve of each washing; fusing and analyzing the first water temperature change factor and the second water temperature change factor of the same washing to obtain the normal degree of constant temperature control of each washing in the reference washing stage; The normal degree of constant temperature control and the first water temperature change factor and the second water temperature change factor are negatively correlated; The determination of the effectiveness index of the reference washing stage when the reference washing stage is controlled at a constant temperature comprises: sorting the order of multiple washings in the reference washing stage to obtain the sorted washings in the reference washing stage; calculating the difference between the normal degrees of constant temperature control of the first and last washings in the sorted order, and determining a first effectiveness factor of the reference washing stage when the reference washing stage is controlled at a constant temperature according to each difference corresponding to the reference washing stage; determining a second effectiveness factor of the reference washing stage when the reference washing stage is controlled at a constant temperature by negatively correlating the number of washings in the reference washing stage; The first effectiveness factor and the second effectiveness factor when the reference water washing stage is controlled at constant temperature are fused and analyzed to obtain an effectiveness index when the reference water washing stage is controlled at constant temperature.

2. The water washing and drying thermostatic control method of a cadmium plating line according to claim 1, characterized by, The obtaining of the reference water washing stages corresponding to each current water washing stage in the current water washing and drying process and the reference drying stages corresponding to the current drying stage includes: The plating quality parameter value of the preceding operation module of the current candidate stage is obtained, and the plating quality parameter value of the preceding operation module of a historical candidate stage corresponding to the current candidate stage in a plurality of historical water washing and drying processes is obtained. The reference candidate stages corresponding to the current candidate stage are screened out according to the difference between the plating quality parameter values of the current candidate stage and the plurality of historical candidate stages, wherein the candidate stages are water washing stages and drying stages.

3. The water washing and drying thermostatic control method of a cadmium plating line according to claim 1, characterized in that, The reference value index of each temperature control parameter when each reference water washing stage in each historical electroplating cadmium process is controlled at constant temperature includes: The number of times of re-plating caused by water washing in a plurality of historical electroplating cadmium processes is obtained, and the total number of times of re-molding and the electroplating cadmium quality score in the plurality of historical electroplating cadmium processes are obtained. For each historical electroplating cadmium process, the reference value index of each temperature control parameter when each reference water washing stage in the historical electroplating cadmium process is controlled at constant temperature is determined according to the ratio of the number of times of re-plating caused by water washing to the total number of times of re-molding, the total number of times of re-molding, and the electroplating cadmium quality score corresponding to the historical electroplating cadmium process.

4. The water washing and drying thermostatic control method of a cadmium plating line according to claim 3, characterized in that, The reference value index of the historical electroplating cadmium process includes: The negative correlation value of the ratio and the total number of times of re-molding is calculated, and the fusion result of the two negative correlation values is taken as the reference weight of the electroplating cadmium quality score. After the electroplating cadmium quality score is weighted using the reference weight, normalization processing is performed to obtain the reference value index of the historical water washing.

5. The water washing and drying thermostatic control method of a cadmium plating line according to claim 1, characterized in that, The temperature adjustment range of each current water washing stage includes: The reference value index and the effectiveness index of the same reference water washing stage are fused and analyzed to obtain a temperature correction coefficient of each reference water washing stage. The temperature upper limit threshold of the reference water washing stage corresponding to the current water washing stage in different historical electroplating cadmium processes is weighted and summed using the temperature correction coefficient of each reference water washing stage to obtain a temperature upper limit value of the temperature adjustment range of each current water washing stage. Similarly, the temperature lower limit threshold of the reference water washing stage corresponding to the current water washing stage in different historical electroplating cadmium processes is weighted and summed to obtain a temperature lower limit value of the temperature adjustment range of each current water washing stage.

6. The water washing and drying thermostatic control method of a cadmium plating line according to claim 1, characterized in that, The determination of the temperature adjustment range of the current drying stage includes: If the number of times of re-molding of the reference drying stage is greater than a preset number of times, 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 the abnormal drying stages is recorded as a first temperature threshold, and the average drying temperature of all the normal drying stages is recorded as a second temperature threshold; and The temperature adjustment range of the current drying stage is determined according to the first temperature threshold and the second temperature threshold. determining a temperature adjustment range for a current drying stage according to the first temperature threshold value and the second temperature threshold value.

7. The water washing and drying thermostatic control method of a cadmium plating line according to claim 6, characterized in that, The determining a temperature adjustment range for a current drying stage according to the first temperature threshold value and the second temperature threshold value comprises: calculating a difference value between the first temperature threshold value and the second temperature threshold value as a temperature adjustment value; taking a difference value between the second temperature threshold value and the temperature adjustment value as a temperature upper limit value of the temperature adjustment range for the current drying stage; taking a value obtained by adding the second temperature threshold value and the temperature adjustment value as a temperature lower limit value of the temperature adjustment range for the current drying stage.

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