A method and apparatus for controlling an electrophoretic system for automotive leaf springs

Abstract

The application relates to the technical field of electrophoretic plating, in particular to an electrophoretic system control method and device for automobile plate springs. The method is used for presetting an initial voltage and a target voltage, performing electrophoretic coating on the automobile plate springs, collecting voltage, current and different types of electrophoretic environment data in the electrophoretic coating process, and film thickness of different measuring points of the coated automobile plate springs; determining electrophoretic quality evaluation value, average approximation degree and influence factor, determining the influence factor of the electrophoretic environment data and the boosting control reference of the electrophoretic coating process; obtaining the boosting rate of the electrophoretic coating process, calculating the optimal boosting rate of the next electrophoretic coating process of the electrophoretic coating process, and realizing the control of the boosting rate of the electrophoretic system according to the optimal boosting rate until the voltage reaches the target voltage. The application can improve the quality and efficiency of the electrophoretic coating of the electrophoretic system.

Description

TECHNICAL FIELD

[0001] The application relates to the technical field of electrophoretic plating, in particular to an electrophoretic system control method and device for automobile leaf springs. BACKGROUND

[0002] Electrophoretic coating is a core process for the corrosion protection treatment of automobile leaf springs, which can help ensure the stiffness of the leaf spring, provide corrosion protection, effectively prolong the service life of the leaf spring, reduce the frequency of maintenance and replacement, and ensure the safety of automobile driving. Generally, the electrophoretic coating of the automobile leaf spring is achieved by conducting film electrodeposition on a conductive base material through the electrophoretic method.

[0003] However, the leaf spring has a complex geometry and structures such as edges, holes and recesses, and the "edge effect" easily occurs in the electrophoretic process, that is, the electric field is concentrated at the edges and sharp corners, and the film is deposited too quickly, while the film in the recessed area is weak, which seriously affects the uniformity of the coating and the overall corrosion resistance. The traditional program voltage control method can alleviate the problem to a certain extent, but the voltage rate is often set by experience, lacks dynamic response capability to real-time process state and bath environment parameters, and is difficult to balance film thickness uniformity and production efficiency, often resulting in high film defect risk and low paint utilization. SUMMARY

[0004] To solve the above technical problems, the application provides an electrophoretic system control method and device for automobile leaf springs, and the technical solutions adopted are as follows:

[0005] In a first aspect, one embodiment of the application provides an electrophoretic system control method for automobile leaf springs, which comprises the following steps:

[0006] An initial voltage and a target voltage are preset, and the automobile leaf spring is electrophoretically coated, the voltage, current and different types of electrophoretic environment data at different collection times in a preset number of electrophoretic coating processes are collected, and the film thickness of different measurement points of the automobile leaf spring after each coating is completed is collected.

[0007] According to the differences between all the same types of electrophoretic environment data of the same electrophoretic coating process and the preset optimal values, and the differences between the film thickness and the preset ideal film thickness, the electrophoretic quality evaluation value of each electrophoretic coating process and the average approximation degree of all types of electrophoretic environment data, and the influence factor of each type of electrophoretic environment data are determined, according to the differences between the change trend of the same type of electrophoretic environment data of the electrophoretic coating process and the same type of electrophoretic environment data of different electrophoretic coating processes before the electrophoretic coating process, and the influence factor of each type of electrophoretic environment data, the voltage control reference of the electrophoretic coating process is determined.

[0008] According to the actual value of the voltage boosting control reference and the voltage boosting rate of the preset number of times of the electrophoretic coating process, the voltage boosting rate of the electrophoretic coating process is obtained, the local current density of the electrophoretic coating process at all collection times is collected, the average approximation degree of all kinds of electrophoretic environment data of the electrophoretic coating process and the voltage boosting rate of the electrophoretic coating process are combined, the optimal voltage boosting rate of the next electrophoretic coating process of the electrophoretic coating process is calculated, and the control of the voltage boosting rate of the electrophoretic system is realized according to the optimal voltage boosting rate until the voltage reaches the target voltage.

[0009] Further, the method for obtaining the average approximation degree of the electrophoretic environment data is:

[0010] Any one kind of electrophoretic environment data in the electrophoretic coating process is recorded as target electrophoretic environment data.

[0011] The absolute value of the difference between the target electrophoretic environment data and the optimal value of the preset electrophoretic environment data is recorded as the first absolute value of the target electrophoretic environment data, and the ratio of the first absolute value of the target electrophoretic environment data to the maximum value of all electrophoretic environment data in the same electrophoretic coating process is recorded as the first ratio of the target electrophoretic environment data.

[0012] The negative correlation processing result of the cumulative sum of the first ratio of the target electrophoretic environment data at all collection times in the same electrophoretic coating process is recorded as the average approximation degree of the target electrophoretic environment data in the same electrophoretic coating process.

[0013] Further, the method for obtaining the electrophoretic quality evaluation value of the electrophoretic coating process is:

[0014] The cumulative sum of the absolute value of the difference between the film thickness of the automobile leaf spring at different measurement points in the same electrophoretic coating process and the preset ideal film thickness is recorded as the film thickness cumulative difference.

[0015] The product of the range of the film thickness of all measurement points of the automobile leaf spring in the same electrophoretic coating process and the film thickness cumulative difference is recorded as the first product of the measurement points.

[0016] The ratio of the cumulative sum of the average approximation degrees of all kinds of electrophoretic environment data in the same electrophoretic coating process to the first product of the measurement points is recorded as the electrophoretic quality evaluation value of the same electrophoretic coating process.

[0017] Further, the method for obtaining the influence factor of the electrophoretic environment data is:

[0018] The sum of the average proximities of all the target electrophoretic environmental data of the electrophoretic coating processes is recorded as the cumulative average proximity of the target electrophoretic environmental data; the sum of the cumulative average proximities of all the electrophoretic environmental data other than the target electrophoretic environmental data is recorded as the first sum value of the target electrophoretic environmental data, and the ratio of the first sum value of the target electrophoretic environmental data to the cumulative average proximity of the target electrophoretic environmental data is recorded as the second ratio value of the target electrophoretic environmental data.

[0019] The ratio of the second ratio value of the target electrophoretic environmental data to the sum of the electrophoretic quality evaluation values of all the electrophoretic coating processes is recorded as the influence factor of the target electrophoretic environmental data.

[0020] Further, the method for obtaining the boost control reference of the electrophoretic coating process is as follows:

[0021] According to all the target electrophoretic environmental data of the same electrophoretic coating process, a target electrophoretic environmental data sequence of the same electrophoretic coating process is obtained; and according to the difference between the target electrophoretic environmental data sequence of the electrophoretic coating process and the target electrophoretic environmental data sequence of a preset number of electrophoretic coating processes before the electrophoretic coating process, a target electrophoretic environmental data normalized difference of the electrophoretic coating process is determined.

[0022] The product of the influence factor of the target electrophoretic environmental data and the target electrophoretic environmental data normalized difference of the electrophoretic coating process is recorded as the second product of the target electrophoretic environmental data, and the negative correlation processing result of the sum of the second products of all the electrophoretic environmental data is recorded as the first cumulative sum of the electrophoretic coating process.

[0023] The product of the electrophoretic quality evaluation value of the electrophoretic coating process and the first cumulative sum is recorded as the boost control reference of the electrophoretic coating process.

[0024] Further, the method for obtaining the target electrophoretic environmental data normalized difference of the electrophoretic coating process is as follows:

[0025] The sum of the difference between the target electrophoretic environmental data sequence of the electrophoretic coating process and the target electrophoretic environmental data sequence of a preset number of electrophoretic coating processes before the electrophoretic coating process is recorded as the target electrophoretic environmental data difference of the electrophoretic coating process, and the normalized value of the target electrophoretic environmental data difference of the electrophoretic coating process is recorded as the target electrophoretic environmental data normalized difference of the electrophoretic coating process.

[0026] Further, the method for obtaining the boost rate of the electrophoretic coating process is as follows:

[0027] The boost control reference of a preset number of electrophoretic coating processes before the electrophoretic coating process is used as the weight of the actual value of the boost rate, and the weighted sum is recorded as the boost rate of the electrophoretic coating process.

[0028] Further, the calculating the optimal voltage increasing rate of the next electrophoretic coating process of the electrophoretic coating process, achieving the control of the voltage increasing rate of the electrophoretic system until the voltage reaches the target voltage, comprises the following specific contents:

[0029] The accumulation of the average approaching degree of all kinds of electrophoretic environment data of the electrophoretic coating process is recorded as the accumulated approaching degree of the electrophoretic coating process, the ratio of the local current density of the electrophoretic coating process at the collection time to the accumulated approaching degree is recorded as the third ratio of the electrophoretic coating process at the collection time, and the negative correlation processing result of the accumulation of the third ratio of the electrophoretic coating process at all collection times is recorded as the fourth ratio of the electrophoretic coating process.

[0030] The optimal voltage increasing rate of the next electrophoretic coating process of the electrophoretic coating process is calculated according to the fourth ratio of the electrophoretic coating process at all collection times and the voltage increasing rate of the electrophoretic coating process.

[0031] The optimal voltage increasing rate of the next electrophoretic coating process of the electrophoretic coating process is taken as the value of the voltage increasing rate of the next electrophoretic coating process of the electrophoretic coating process until the voltage is equal to the target voltage, and the control of the voltage increasing rate of the electrophoretic system is achieved.

[0032] Further, the calculation formula of the optimal voltage increasing rate is as follows:

[0033]

[0034] Wherein, represents the optimal voltage increasing rate of the next electrophoretic coating process of the electrophoretic coating process; represents the voltage increasing rate of the electrophoretic coating process; represents the fourth ratio of the electrophoretic coating process; represents the first tertile of the fourth ratio of the electrophoretic coating process and the preset number of electrophoretic coating processes before the electrophoretic coating process; represents the second tertile of the fourth ratio of the electrophoretic coating process and the preset number of electrophoretic coating processes before the electrophoretic coating process, .

[0035] In the second aspect, another embodiment of the present application provides an electrophoretic system control device for automobile leaf springs, which comprises a memory, a processor, and a computer program stored in the memory and executable on the processor, and the processor implements the steps of the above-mentioned electrophoretic system control method for automobile leaf springs when executing the computer program.

[0036] The embodiments of the present application have at least the following beneficial effects:

[0037] The application realizes control of the boosting rate of the next electrophoretic coating process in the electrophoretic coating process according to different times of electrophoretic coating. Specifically, first, the ideal degree of the film thickness of the surface paint of the automobile leaf spring under the control of the electrophoretic system is evaluated, and the electrophoretic quality evaluation value of the electrophoretic coating process is obtained. The greater the electrophoretic quality evaluation value, the more ideal the film thickness of the surface paint of the automobile leaf spring under the control of the electrophoretic system, the more uniform and closer to the ideal film thickness the film thickness of the surface paint of the automobile leaf spring, and the higher the electrophoretic production quality of the automobile leaf spring. The influence degree of the electrophoretic environmental data of each type on the electrophoretic process is determined, the influence factor of the electrophoretic environmental data is obtained, the electrophoretic coating process is evaluated to provide a reference for the reference degree of the subsequent electrophoretic coating process, and the boosting control reference of the electrophoretic coating process is obtained. Then, the actual value of the boosting rate of the preset number of times of electrophoretic coating process before the electrophoretic coating process is obtained, the boosting rate of the electrophoretic coating process is obtained, and the average approaching degree of all types of electrophoretic environmental data of the electrophoretic coating process and the boosting rate of the electrophoretic coating process are combined to calculate the optimal boosting rate of the next electrophoretic coating process of the electrophoretic coating process. The optimal boosting rate is the optimal value of the adaptive regulation of the boosting rate of the boosting process of the electrophoretic system determined according to the specific needs of the electrophoretic coating process, the control of the boosting rate of the electrophoretic system is realized, the problem that the boosting rate does not match the demand of the real-time process state in the process of electrophoretic coating of the electrophoretic system, which leads to the problem that the edge effect cannot be fully suppressed or the production efficiency is insufficient, the quality and efficiency of the electrophoretic coating of the electrophoretic system are improved, and the influence of the edge effect is reduced after the voltage reaches the target voltage to complete the electrophoretic process. The film thickness uniformity at different positions of the automobile leaf spring is improved, and the electrophoretic quality and efficiency of the electrophoretic system are improved. BRIEF DESCRIPTION OF DRAWINGS

[0038] In order to more clearly illustrate the technical solutions and advantages of the embodiments of the present application or the prior art, the drawings needed in the embodiments or the prior art description will be briefly introduced. Obviously, the drawings in the following description are only some embodiments of the present application, and those skilled in the art can obtain other drawings according to these drawings without creating any creative labor.

[0039] Figure 1 A step flow chart of an electrophoretic system control method for an automobile leaf spring provided by an embodiment of the present application is provided.

[0040] Figure 2 An average approaching degree acquisition flow chart provided by an embodiment of the present application. DETAILED DESCRIPTION

[0041] In order to further illustrate the technical means and effects taken by the present application to achieve the predetermined object, the specific implementation, structure, features and effects of the method and device for controlling an electrophoresis system of an automobile leaf spring according to the present application are described in detail as follows 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.

[0042] 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.

[0043] The specific scheme of the method and device for controlling an electrophoresis system of an automobile leaf spring provided by the present application is specifically described below in combination with the drawings.

[0044] Please refer to Figure 1 which shows a step flow chart of a method for controlling an electrophoresis system of an automobile leaf spring according to an embodiment of the present application. The method comprises the following steps:

[0045] In step S001, an initial voltage and a target voltage are preset, and an automobile leaf spring is electrophoretically coated. Voltage, current and different types of electrophoretic environment data at different collection times during a preset number of electrophoretic coating processes are collected, and the film thickness of different measurement points of the automobile leaf spring after each coating is completed is collected.

[0046] The electrophoresis system is composed of an electrophoresis tank, a direct current power supply, an anode system, a circulating filtration system, an ultrafiltration system and a cold and hot exchange unit. The direct current power supply of the electrophoresis system is controllable, the target voltage is set according to the electrophoretic process, the voltage and current are collected in real time during the electrophoresis process through the SCADA system, and the temperature, pH value and conductivity of the tank liquid are collected in real time during the electrophoresis process through the temperature sensor, the pH meter and the conductivity meter. The temperature, pH value and conductivity of the tank liquid are all recorded as electrophoretic environment data.

[0047] In this embodiment, the target voltage of the electrophoretic process is set to 290V; the SCADA system is a commonly known data acquisition and monitoring control system for industrial automation and control; the optimal temperature of the tank liquid is set to 35℃, the optimal pH value of the tank liquid is set to 5.8, the pH value of the tank liquid should be greater than or equal to 5.6 and less than or equal to 6.0, the optimal conductivity of the tank liquid is set to 1400us / cm, and the conductivity of the tank liquid should be greater than or equal to 800us / cm and less than or equal to 1400us / cm; the sampling frequency of the voltage and current is 10 Hz, and the sampling frequency of the electrophoretic environment data is 2 Hz.

[0048] The voltage of the electrophoretic system is directly controlled by a program, and an initial voltage needs to be preset. After running at the initial voltage for 10-30 seconds, the voltage of the electrophoretic system gradually rises from the initial voltage to a target voltage, and then the target voltage is maintained until the end of the electrophoretic process, so as to ensure that the paint film reaches the final required thickness.

[0049] The initial voltage is higher than the deposition critical voltage of the paint, and the value of the deposition critical voltage of the paint is a known value and will not be repeated here. The purpose of the initial voltage is to uniformly deposit a very thin and insulating initial paint film on the surface of the workpiece to be processed, so as to reduce the initial current impact. In this embodiment, the initial voltage is set to 50V.

[0050] When the automobile leaf spring is electrophoretically coated, the pretreated and cleaned leaf spring is immersed in a large tank filled with electrophoretic paint. The cathodic electrophoresis process is used, and the leaf spring is usually connected as an anode electrode and passed through direct current. Under the action of the electric field, the resin and pigment in the paint will be uniformly deposited on the entire surface of the leaf spring. The surface structure of the automobile leaf spring is complex and has edges and corners. When electrophoresis is performed, the electric field is concentrated at the sharp corners or edges of the automobile leaf spring surface, the current density is large, the deposition speed is fast, and the paint film on the surface of the leaf spring is thick. The current density is moderate on the flat surface of the automobile leaf spring, and the thickness of the paint film on the surface of the leaf spring is normal. The current is weak and the current density is small in the recessed surface of the automobile leaf spring, and the deposition is slow, and the paint film on the surface of the leaf spring is thin. Therefore, when the automobile leaf spring is electrophoretically coated, edge effects are prone to occur, that is, the thickness of the paint film on the surface of the leaf spring is insufficient at the sharp corners or edges of the automobile leaf spring surface, thereby affecting the safety of the automobile leaf spring.

[0051] In this embodiment, 100 times of voltage, current and different types of electrophoretic environment data at different collection times during the electrophoretic coating process are collected.

[0052] Therefore, when the automobile leaf spring is electrophoretically coated, a program-controlled voltage increasing method is usually used to alleviate the above problems, that is, an initial voltage is set, and the voltage gradually rises from the initial voltage to a target voltage. In this process, the resistance of the area where the paint is first deposited increases, and the current will naturally shift to the area where the resistance is still low, thereby promoting the uniform growth of the paint film. However, in this process, if the voltage increasing rate is too large, the edge effect will also occur; and if the voltage increasing rate is too small, the production efficiency is low, and the film thickness on the recessed surface of the leaf spring may be insufficient. Therefore, it is necessary to control the voltage increasing rate of the electrophoretic system during electrophoretic coating, so that the voltage increasing rate matches the demand of the real-time process state of the electrophoretic coating, improves the film thickness uniformity of the leaf spring, suppresses the edge effect, avoids current impact, reduces paint film defects, improves the utilization rate and penetration of the paint, and improves the quality and efficiency of the electrophoretic system during electrophoretic coating.

[0053] The film thickness of the measuring points of the automobile leaf spring is measured by using a magnetic dry film thickness gauge after the automobile leaf spring is electrophoretically coated, the measuring points of the automobile leaf spring including a main sheet plane position, a roll ear position, an edge position and a hole position of the automobile leaf spring.

[0054] At this time, the voltage, the current and the different kinds of electrophoretic environment data at different collection time points in the preset number of electrophoretic coating processes are obtained, and the film thickness of the automobile leaf spring after each coating is completed.

[0055] In step S002, the electrophoretic quality evaluation value of each electrophoretic coating process and the average approaching degree of all kinds of electrophoretic environment data are determined according to the difference between the same kind of electrophoretic environment data of the same electrophoretic coating process and the preset optimal value, and the difference between the film thickness and the preset ideal film thickness, and the influence factor of each kind of electrophoretic environment data is determined, and the voltage rise control reference of the electrophoretic coating process is determined according to the difference between the change trend of the same kind of electrophoretic environment data of the electrophoretic coating process and the same kind of electrophoretic environment data of the different electrophoretic coating processes before the electrophoretic coating process, and the influence factor of each kind of electrophoretic environment data.

[0056] The average approaching degree of the same kind of electrophoretic environment data of the same electrophoretic coating process is determined according to the difference between the same kind of electrophoretic environment data of the same electrophoretic coating process and the preset optimal value.

[0057] The electrophoretic environment data of any one kind in the electrophoretic coating process is recorded as the target electrophoretic environment data, the absolute value of the difference between the target electrophoretic environment data and the optimal value of the electrophoretic environment data in the same electrophoretic coating process is recorded as the first absolute value of the target electrophoretic environment data, the ratio of the first absolute value of the target electrophoretic environment data to the maximum value of all electrophoretic environment data in the same electrophoretic coating process is recorded as the first ratio of the target electrophoretic environment data, and the negative correlation processing result of the cumulative sum of the first ratio of the target electrophoretic environment data at all collection time points in the same electrophoretic coating process is recorded as the average approaching degree of the target electrophoretic environment data in the same electrophoretic coating process.

[0058] The optimal values of the temperature, the PH value and the conductivity of the electrolyte are the optimal temperature, the optimal PH value and the optimal conductivity of the electrolyte, respectively.

[0059] It can be understood that the accumulation sum of the first ratio of the target electrophoretic environment data at all collection moments in the electrophoretic coating process is negatively correlated, that is, the accumulation sum of the first ratio of the target electrophoretic environment data at all collection moments in the electrophoretic coating process is negatively correlated with the average approximation degree of the target electrophoretic environment data. It can be understood that the negative correlation in the present application refers to the relationship between the independent variable and the dependent variable, the independent variable is the accumulation sum of the first ratio of the target electrophoretic environment data at all collection moments in the electrophoretic coating process, and the dependent variable is the average approximation degree of the target electrophoretic environment data. The negative correlation is that the dependent variable decreases (increases) as the independent variable increases (decreases), which can be an inverse relationship, a subtraction relationship, etc.

[0060] Preferably, as an embodiment of the present application, the reciprocal of the sum of the accumulation sum of the first ratio of the target electrophoretic environment data at all collection moments in the same electrophoretic coating process and the number 1 is recorded as the average approximation degree of the target electrophoretic environment data of the same electrophoretic coating process.

[0061] The average approximation degree of any one kind of electrophoretic environment data of each electrophoretic coating process can be obtained in the same way. The average approximation degree acquisition flow chart is shown in Figure 2 .

[0062] According to the difference between the film thickness of the same electrophoretic coating process and the preset ideal film thickness, and the average approximation degree of all kinds of electrophoretic environment data, the electrophoretic quality evaluation value of the same electrophoretic coating process is determined.

[0063] The accumulation sum of the absolute value of the difference between the film thickness of the different measurement points of the automobile leaf spring in the same electrophoretic coating process and the preset ideal film thickness is recorded as the film thickness accumulation difference. The product of the range of the film thickness of all measurement points of the automobile leaf spring in the same electrophoretic coating process and the film thickness accumulation difference is recorded as the first product of the measurement points. The ratio of the accumulation sum of the average approximation degree of all kinds of electrophoretic environment data in the same electrophoretic coating process and the first product of the measurement points is recorded as the electrophoretic quality evaluation value of the same electrophoretic coating process.

[0064] In this embodiment, the value of the ideal film thickness is 20 ; in the ratio calculation process, in order to avoid the case that the denominator is zero, a preset value needs to be added to the denominator, and the value of the preset value in the embodiment is 0.001.

[0065] The greater the electrophoretic quality evaluation value, the more ideal the film thickness of the automobile leaf spring surface paint film under the control of the electrophoretic system, that is, the more uniform and closer to the ideal film thickness the film thickness of the automobile leaf spring surface paint film, and the higher the electrophoretic production quality of the automobile leaf spring.

[0066] In the process of using electrophoretic coating process to achieve the corrosion protection of automobile leaf spring, the electrophoretic coating process in different production processes may be different, and the environmental parameters of the electrophoretic tank liquid in different production processes cannot be kept completely consistent, which affects the quality and efficiency of electrophoresis. Therefore, the influence degree of each kind of electrophoretic environmental data on the electrophoretic process can be determined respectively.

[0067] Taking the PH value in the electrophoretic environmental data as an example, in the electrophoretic process, the resin of the cathodic electrophoretic paint is positively charged, and under the action of a direct current electric field, the positively charged resin particles swim to the negatively charged leaf spring workpiece and deposit. At the same time, an electrolytic reaction occurs on the surface of the leaf spring workpiece to produce hydroxyl ions, which penetrate into the electrophoretic tank liquid, causing the alkalinity of the entire tank liquid to increase, i.e. the PH value increases. Therefore, the change of the PH value of the electrophoretic tank liquid can reflect its relevance to the resin deposition process. Similarly, other kinds of electrophoretic environmental data can also reflect their relevance to the resin deposition process.

[0068] According to the average approach degree of each kind of electrophoretic environmental data of all electrophoretic coating processes and the electrophoretic quality evaluation value, the influence factor of each kind of electrophoretic environmental data is determined respectively.

[0069] The cumulative sum of the average approach degree of the target electrophoretic environmental data of all electrophoretic coating processes is recorded as the cumulative average approach degree of the target electrophoretic environmental data. The cumulative average approach degree of each kind of electrophoretic environmental data can be obtained in the same way. The sum of the cumulative average approach degree of all kinds of electrophoretic environmental data except the target electrophoretic environmental data is recorded as the first sum value of the target electrophoretic environmental data. The ratio of the first sum value of the target electrophoretic environmental data to the cumulative average approach degree of the target electrophoretic environmental data is recorded as the second ratio value of the target electrophoretic environmental data. The ratio of the second ratio value of the target electrophoretic environmental data to the cumulative sum of the electrophoretic quality evaluation value of all electrophoretic coating processes is recorded as the influence factor of the target electrophoretic environmental data.

[0070] The influence factor of each kind of electrophoretic environmental data can be obtained in the same way.

[0071] According to the difference between the change trend of the same kind of electrophoretic environmental data of the electrophoretic coating process and the different electrophoretic coating process before the electrophoretic coating process, and the influence factor of each kind of electrophoretic environmental data, the boost control reference of the electrophoretic coating process is determined.

[0072] Arranging all target electrophoretic environment data in the same electrophoretic coating process in the order of collection time, a target electrophoretic environment data sequence of the same electrophoretic coating process is obtained. The same method can be used to obtain the electrophoretic environment data sequence of each type of each electrophoretic coating process. The cumulative sum of the DTW distance between the target electrophoretic environment data sequence of the electrophoretic coating process and the target electrophoretic environment data sequence of the preset number of electrophoretic coating processes before the electrophoretic coating process is recorded as the target electrophoretic environment data difference of the electrophoretic coating process. The same method can be used to obtain the electrophoretic environment data difference of each type of each electrophoretic coating process. The normalized value of the target electrophoretic environment data difference of the electrophoretic coating process is recorded as the target electrophoretic environment data normalized difference of the electrophoretic coating process.

[0073] In this embodiment, the preset number is 100.

[0074] Preferably, as an embodiment of the present application, the ratio of the normalized value of the target electrophoretic environment data difference of the electrophoretic coating process to the cumulative sum of the electrophoretic environment data differences of all types is recorded as the target electrophoretic environment data normalized difference of the electrophoretic coating process.

[0075] The product of the influence factor of the target electrophoretic environment data and the target electrophoretic environment data normalized difference of the electrophoretic coating process is recorded as the second product of the target electrophoretic environment data. The negative correlation processing result of the cumulative sum of the second products of all electrophoretic environment data is recorded as the first cumulative sum of the electrophoretic coating process. The product of the electrophoretic quality evaluation value of the electrophoretic coating process and the first cumulative sum is recorded as the boost control reference of the electrophoretic coating process.

[0076] It can be understood that the cumulative sum of the second products of all electrophoretic environment data is negatively correlated, that is, the cumulative sum of the second products of all electrophoretic environment data is negatively correlated with the first cumulative sum of the electrophoretic coating process. It can be understood that the negative correlation in the present application refers to the relationship between the independent variable and the dependent variable, the independent variable is the cumulative sum of the second products of all electrophoretic environment data, and the dependent variable is the first cumulative sum of the electrophoretic coating process. The negative correlation is that the dependent variable decreases (increases) as the independent variable increases (decreases), which can be an inverse relationship, a subtraction relationship, etc.

[0077] Preferably, as an embodiment of the present application, the cumulative sum of the second products of all electrophoretic environment data is used as the index of the exponential function, and the value of the exponential function is recorded as the first cumulative sum of the electrophoretic coating process, wherein the value of the base of the exponential function in this embodiment is .

[0078] The voltage boosting control reference of the electrophoretic coating process is used to evaluate the reference degree of the electrophoretic coating process to the subsequent electrophoretic coating process, and the greater the voltage boosting control reference of the electrophoretic coating process, the greater the reference degree of the electrophoretic coating process to the subsequent electrophoretic coating process.

[0079] At this point, the voltage boosting control reference of each electrophoretic coating process is obtained.

[0080] In step S003, the voltage boosting rate of the electrophoretic coating process is obtained according to the voltage boosting control reference and the actual value of the voltage boosting rate of the preset number of electrophoretic coating processes before the electrophoretic coating process, the local current density of the electrophoretic coating process at all collection time points is collected, the optimal voltage boosting rate of the next electrophoretic coating process of the electrophoretic coating process is calculated by combining the average approximation degree of all kinds of electrophoretic environment data of the electrophoretic coating process and the voltage boosting rate of the electrophoretic coating process, and the control of the voltage boosting rate of the electrophoretic system is realized according to the optimal voltage boosting rate until the voltage reaches the target voltage.

[0081] The voltage boosting rate of the electrophoretic coating process is obtained according to the voltage boosting control reference and the actual value of the voltage boosting rate of the preset number of electrophoretic coating processes before the electrophoretic coating process.

[0082] The voltage boosting control reference of the preset number of electrophoretic coating processes before the electrophoretic coating process is used as the weight of the actual value of the voltage boosting rate, the voltage boosting control reference is used to weight and sum the actual value of the voltage boosting rate, and the result of the weighted sum is recorded as the voltage boosting rate of the electrophoretic coating process.

[0083] It can be understood that the voltage boosting rate of the electrophoretic coating is usually greater than or equal to 50 and less than or equal to 250 The voltage boosting rate of the electrophoretic coating is the average value of the ratio of the voltage difference between all adjacent collection time points in the voltage boosting process of the electrophoretic coating process to the time interval between the adjacent collection time points.

[0084] The electric field distribution model can simulate the density distribution of the current at different parts of the workpiece under a given voltage to obtain the local current density of each point on the surface of the workpiece. The greater the local current density, the greater the deposition rate of the paint film. The specific establishment process of the electric field distribution model is a known technology and will not be described here.

[0085] The detection points are set on the automobile leaf spring during electrophoretic coating, and the detection points are set at the edge recessed positions of the automobile leaf spring. The local current density is collected using a current density meter, and the collection time interval of the local current density is 1 second.

[0086] The cumulative sum of the average approaching degree of all kinds of electrophoretic environment data of the electrophoretic coating process is denoted as the cumulative approaching degree of the electrophoretic coating process, the ratio of the local current density of the electrophoretic coating process at the collection time to the cumulative approaching degree is denoted as the third ratio of the electrophoretic coating process at the collection time, and the negative correlation processing result of the cumulative sum of the third ratios of the electrophoretic coating process at all collection times is denoted as the fourth ratio of the electrophoretic coating process.

[0087] It can be understood that the cumulative sum of the third ratios of the electrophoretic coating process at all collection times is negatively correlated, that is, the cumulative sum of the third ratios of the electrophoretic coating process at all collection times is negatively correlated with the fourth ratio of the electrophoretic coating process. It can be understood that the negative correlation in the present application refers to the relationship between the independent variable and the dependent variable, the independent variable is the cumulative sum of the third ratios of the electrophoretic coating process at all collection times, and the dependent variable is the fourth ratio of the electrophoretic coating process. The negative correlation is that the dependent variable decreases (increases) as the independent variable increases (decreases), which can be an inverse relationship, a subtraction relationship, etc.

[0088] Preferably, as an embodiment of the present application, the cumulative sum of the third ratios of the electrophoretic coating process at all collection times is taken as the index of the exponential function, and the value of the exponential function is denoted as the fourth ratio of the electrophoretic coating process, wherein the value of the base of the exponential function in this embodiment is .

[0089] The smaller the fourth ratio is, the greater the cumulative film thickness difference is, and the slower the voltage increasing rate should be, so as to reduce the difference between the film thicknesses. The greater the fourth ratio is, the smaller the cumulative film thickness difference is, and the more the value of the electrophoretic environment data conforms to the ideal condition of the electrophoretic process, and the smaller the influence of the voltage increase on the environmental parameters is.

[0090] According to the fourth ratio of the electrophoretic coating process at all collection times and the voltage increasing rate of the electrophoretic coating process, the optimal voltage increasing rate of the next electrophoretic coating process of the electrophoretic coating process is calculated.

[0091]

[0092] wherein, represents the optimal voltage increasing rate of the next electrophoretic coating process of the electrophoretic coating process; represents the voltage increasing rate of the electrophoretic coating process; represents the fourth ratio of the electrophoretic coating process; represents the first tertile of the fourth ratios of the electrophoretic coating process and the preset number of electrophoretic coating processes before the electrophoretic coating process; represents the second tertile of the fourth ratios of the electrophoretic coating process and the preset number of electrophoretic coating processes before the electrophoretic coating process, .

[0093] The optimal boosting rate of the next electrophoretic coating process of the electrophoretic coating process is taken as the value of the boosting rate of the next electrophoretic coating process of the electrophoretic coating process, the adaptive regulation of the boosting rate of the boosting process of the electrophoretic system is completed, the target voltage is maintained after the voltage reaches the target voltage to complete the electrophoresis process, the influence of the edge effect is reduced, the film thickness uniformity at different positions of the automobile leaf spring is improved, and the electrophoretic quality and efficiency of the electrophoretic system are improved.

[0094] At this point, the control of the boosting rate of the electrophoretic system is realized.

[0095] The embodiment of the present application also provides an electrophoretic system control device for an automobile leaf spring, which comprises a memory, a processor and a computer program stored in the memory and executable on the processor, and the processor realizes the steps described above when executing the computer program. Since the electrophoretic system control method for the automobile leaf spring is described in detail above, it will not be repeated here.

[0096] It should be noted that: the above-mentioned sequence of the embodiments of the present application is only for description, and does not represent the advantages and disadvantages of the embodiments. And the above describes the specific embodiments of the present application. In addition, the processes depicted in the drawings do not necessarily require the specific order or continuous order shown to achieve the desired results. In some embodiments, multitasking and parallel processing are possible or can be advantageous.

[0097] Each embodiment in the specification is described in a progressive manner, and the same or similar parts between each embodiment can be referred to each other, and each embodiment mainly describes the difference from other embodiments.

[0098] The above-described embodiments are only used to illustrate the technical solutions of the present application, and not to limit them; the technical solutions recorded in the above-described embodiments are modified, or some technical features are replaced, without changing the essence of the corresponding technical solutions out of the scope of the technical solutions of the embodiments of the present application, which should be included in the protection scope of the present application.

Claims

1. An electrophoretic system control method for a vehicle leaf spring, characterized by, The method comprises the following steps: preset initial voltage and target voltage, electrocoating the automobile leaf spring, collecting voltage, current and different types of electrocoating environment data at different collection time points in the preset number of electrocoating processes, collecting the film thickness of the automobile leaf spring at different measuring points after each coating is completed; According to the difference between all the same type of electrocoating environment data of the same electrocoating process and the preset optimal value, and the difference between the film thickness and the preset ideal film thickness, the electrocoating quality evaluation value of each electrocoating process and the average approximation degree of all types of electrocoating environment data are determined respectively, and the influence factor of each type of electrocoating environment data is determined, and according to the difference between the change trend of the same type of electrocoating environment data of the electrocoating process and the same type of electrocoating environment data of the different electrocoating process before the electrocoating process, and the influence factor of each type of electrocoating environment data, the voltage rising control reference of the electrocoating process is determined. According to the voltage rising control reference of the preset number of electrocoating processes before the electrocoating process and the actual value of the voltage rising rate, the voltage rising rate of the electrocoating process is obtained, the local current density of the electrocoating process at all collection time points is collected, the average approximation degree of all types of electrocoating environment data of the electrocoating process and the voltage rising rate of the electrocoating process are combined, the optimal voltage rising rate of the next electrocoating process of the electrocoating process is calculated, and the control of the voltage rising rate of the electrocoating system is realized according to the optimal voltage rising rate until the voltage reaches the target voltage.

2. The method of claim 1, wherein the method further comprises: The average approximation degree of the electrocoating environment data is obtained by: any one type of electrocoating environment data in the electrocoating process is recorded as target electrocoating environment data; the absolute value of the difference between the target electrocoating environment data and the optimal value of the preset electrocoating environment data is recorded as the first absolute value of the target electrocoating environment data, and the ratio of the first absolute value of the target electrocoating environment data to the maximum value of all electrocoating environment data in the same electrocoating process is recorded as the first ratio of the target electrocoating environment data; the negative correlation processing result of the cumulative sum of the first ratio of the target electrocoating environment data at all collection time points in the same electrocoating process is recorded as the average approximation degree of the target electrocoating environment data in the same electrocoating process.

3. The method of claim 1, wherein the method further comprises: The electrocoating quality evaluation value of the electrocoating process is obtained by: the cumulative sum of the absolute value of the difference between the film thickness of the automobile leaf spring at different measuring points in the same electrocoating process and the preset ideal film thickness is recorded as the film thickness cumulative difference; the product of the range of the film thickness of all measuring points of the automobile leaf spring in the same electrocoating process and the film thickness cumulative difference is recorded as the first product of the measuring point; the ratio of the cumulative sum of the average approximation degree of all types of electrocoating environment data in the same electrocoating process to the first product of the measuring point is recorded as the electrocoating quality evaluation value of the same electrocoating process.

4. The method of claim 2, wherein the method further comprises: The influence factor of the electrocoating environment data is obtained by: An accumulation sum of average proximities of all kinds of target electrophoretic environmental data of all electrophoretic coating processes is recorded as an accumulation average proximity of target electrophoretic environmental data; an accumulation average proximity sum of all kinds of electrophoretic environmental data other than target electrophoretic environmental data is recorded as a first sum value of target electrophoretic environmental data; a ratio of the first sum value of target electrophoretic environmental data to the accumulation average proximity of target electrophoretic environmental data is recorded as a second ratio value of target electrophoretic environmental data; A ratio of the second ratio value of target electrophoretic environmental data to an accumulation sum of electrophoretic quality evaluation values of all electrophoretic coating processes is recorded as an influence factor of target electrophoretic environmental data.

5. The method of claim 2, wherein the method further comprises: determining a current position of the vehicle; and determining a current position of the vehicle. The method for obtaining the boost control reference of the electrophoretic coating process comprises the following steps: According to all target electrophoretic environmental data of the same electrophoretic coating process, a target electrophoretic environmental data sequence of the same electrophoretic coating process is obtained; according to a difference between the target electrophoretic environmental data sequence of the electrophoretic coating process and target electrophoretic environmental data sequences of a preset number of electrophoretic coating processes before the electrophoretic coating process, a target electrophoretic environmental data normalized difference of the electrophoretic coating process is determined; A product of the influence factor of target electrophoretic environmental data and the target electrophoretic environmental data normalized difference of the electrophoretic coating process is recorded as a second product of target electrophoretic environmental data; a negative correlation processing result of an accumulation sum of all second products is recorded as a first accumulation sum of the electrophoretic coating process; A product of the electrophoretic quality evaluation value of the electrophoretic coating process and the first accumulation sum is recorded as the boost control reference of the electrophoretic coating process.

6. The method of claim 5, wherein the method further comprises: The method for obtaining the target electrophoretic environmental data normalized difference of the electrophoretic coating process comprises the following steps: An accumulation sum of differences between the target electrophoretic environmental data sequence of the electrophoretic coating process and target electrophoretic environmental data sequences of a preset number of electrophoretic coating processes before the electrophoretic coating process is recorded as a target electrophoretic environmental data difference of the electrophoretic coating process; a normalized value of the target electrophoretic environmental data difference of the electrophoretic coating process is recorded as the target electrophoretic environmental data normalized difference of the electrophoretic coating process.

7. The method of claim 1, wherein the method further comprises: determining a current position of the vehicle; and determining a current position of the vehicle. The method for obtaining the boost rate of the electrophoretic coating process comprises the following steps: A boost control reference of a preset number of electrophoretic coating processes before the electrophoretic coating process is used as a weight of an actual value of the boost rate; a weighted sum result is recorded as the boost rate of the electrophoretic coating process.

8. The method of claim 1, wherein the method is used for controlling an electrophoretic system for an automotive leaf spring. The method for calculating the optimal boost rate of the next electrophoretic coating process of the electrophoretic coating process comprises the following steps: An accumulation sum of average proximities of all kinds of electrophoretic environmental data of the electrophoretic coating process is recorded as an accumulation proximity of the electrophoretic coating process; a ratio of a local current density of the electrophoretic coating process at a collection time to the accumulation proximity is recorded as a third ratio value of the electrophoretic coating process at the collection time; a negative correlation processing result of an accumulation sum of third ratio values of the electrophoretic coating process at all collection times is recorded as a fourth ratio value of the electrophoretic coating process; According to the fourth ratio value of the electrophoretic coating process at all collection times and the boost rate of the electrophoretic coating process, the optimal boost rate of the next electrophoretic coating process of the electrophoretic coating process is calculated; The optimal boosting rate of the next electrophoretic coating process of the electrophoretic coating process is taken as the value of the boosting rate of the next electrophoretic coating process of the electrophoretic coating process until the voltage is equal to the target voltage, so as to realize the control of the boosting rate of the electrophoretic system.

9. The method of claim 8, wherein the method further comprises: The calculation formula of the optimal boosting rate is: wherein, represents the optimal boost rate of the next electrophoretic coating process of the electrophoretic coating process; represents the boost rate of the electrophoretic coating process; represents the fourth ratio of the electrophoretic coating process; represents the first tertile of the fourth ratio of the electrophoretic coating process and the fourth ratio of the preset number of electrophoretic coating processes before the electrophoretic coating process; represents the second tertile of the fourth ratio of the electrophoretic coating process and the fourth ratio of the preset number of electrophoretic coating processes before the electrophoretic coating process, .

10. An electrophoretic system control device for a vehicle leaf spring comprising a memory, a processor, and a computer program stored in the memory and operable on the processor, characterized in that, The processor realizes the steps of the control method for the electrophoretic system of the automobile plate spring according to any one of claims 1-9 when executing the computer program.

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