A method for profiled coating thickness control for a spray reciprocator

Abstract

The present application provides a kind of coating thickness control method for spraying reciprocating machine, comprising: by making conformal coating thickness control standard sample, contrast calculation paint output of spray gun, to control conformal coating thickness.Utilize the present application, when using three-proof spraying reciprocating machine to make conformal coating, the process parameters of product required thickness can be quickly determined, product conformal coating thickness control is quickly realized, and the control of conformal coating thickness of printed circuit assembly in most application scenarios is realized at low cost;And process out high-precision printed circuit assembly surface conformal coating with good surface quality consistency and good thickness uniformity, can reduce the workload of technical personnel, improve the production efficiency of printed circuit assembly conformal coating spraying.The method process is stable and reliable, and the coating thickness uniformity is not more than ±10%, which can meet the conformal coating three-proof spraying reciprocating machine spraying thickness control requirements in most application scenarios.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of automatic spraying of conformal coating for printed circuit assembly protection, in particular to a conformal coating thickness control method for a spraying reciprocating machine. BACKGROUND

[0002] With the development of communication technology and electronic technology, printed circuit assemblies are increasingly widely used. With the engineering application of 5G technology, the information transmission requirements of printed circuit assembly products are high-speed and high-frequency, resulting in higher and higher integration of printed circuit assemblies and higher and higher data transmission capacity. At present, high-density and high-capacity printed circuit assembly products with high reliability represented by 5G technology have become the mainstream of practical product applications.

[0003] 5G communication technology has the characteristics of fast transmission speed, low delay and low power consumption, and in addition, 5G communication technology can realize the deep coverage of the network. The development of 5G technology lays the application foundation for the realization of automatic driving technology, Internet of Things technology and intelligent manufacturing, making the arrangement of a large number of sensors, real-time data exchange and processing a reality, and is the main direction of current and future communication technology development.

[0004] With the expansion of the application range of 5G technology, especially the application of printed circuit assembly products in harsh conditions such as industrial fields and outdoors, under the combined action of various types of environmental shadows, phenomena such as corrosion of components, oxidation of pins and metal migration are prone to occur, resulting in product functional failure and damage. Therefore, based on this application requirement, the environmental adaptability of printed circuit assemblies represented by 5G products is put forward with stringent requirements. Conformal coating is very suitable for protecting 5G product printed circuit assemblies because of its good protection effect, low cost, easy implementation, and little effect on the functional characteristics of 5G product printed circuit assemblies, and meets the environmental adaptability requirements of printed circuit assemblies. With the improvement of automation technology and the improvement of customer's rapid delivery requirements, three-proofing spraying reciprocating machines are increasingly widely used in printed circuit assembly conformal coating protection. On the one hand, it can improve the efficiency of printed circuit assembly conformal coating protection, and on the other hand, it can improve the thickness precision and quality of conformal coating. However, due to the fluid characteristics of conformal coating, the determination of the dry film thickness of conformal coating often requires repeated process experiments, which seriously affects the work efficiency of technical personnel and reduces the utilization rate of equipment. This phenomenon is particularly prominent in enterprises that develop multiple varieties of small batches of conformal coating.

[0005] At present, in the application of three-proofing spraying reciprocating machine, it is often necessary to repeatedly perform multiple experiments to determine the process parameters, control the thickness of the conformal coating to meet the technical requirements of printed circuit assembly. But this method is not efficient, the proportion of repeated work is high, which seriously affects the work efficiency of technical personnel. From the current published papers and patents, the relevant coating thickness control technology and equipment integration lead to expensive equipment, the actual use effect is affected by the environment, which cannot meet the general application requirements of printed circuit assembly conformal coating thickness control; in addition, most of the schemes focus on the research and development of conformal coating automatic spraying equipment, the research and development and optimization of coating performance, and none of them consider the rapid and accurate control of conformal coating thickness from the process. Andanda automation equipment Co., Ltd. and Norsun automation abroad are all engaged in the research and development of conformal coating spraying equipment, and the optimization of spray gun, vision and automation control for the application scene of the equipment, none of which involves the content of conformal coating thickness process technology control. The patent "manufacturing method of conformal coating process with thickness control" controls the thickness of conformal coating by optical principle, which needs to be calibrated multiple times, and the calibration process will introduce errors and be greatly affected by the environment, which cannot meet the general requirements of conformal coating thickness control in general environment; the "coating method for accurately controlling coating shape and thickness" uses infrared technology to test the temperature inside and outside the LED substrate coating, and calculates and controls the coating thickness through the PID system. This method also has the problems of high technical complexity, expensive equipment, and errors introduced in the use process, which cannot meet the general requirements of printed circuit assembly coating thickness control in actual application process. SUMMARY

[0006] The present application aims to provide a conformal coating thickness control method for spraying reciprocating machine, to solve the problems of rapid and accurate control of conformal coating thickness in the process of making conformal coating by three-proofing spraying reciprocating machine, to realize the rapid determination of spraying process parameters of conformal coating of spraying reciprocating machine, to improve the quality consistency and thickness precision of conformal coating of related printed circuit assembly products, and to improve the production efficiency of products.

[0007] The present application provides a conformal coating thickness control method for spraying reciprocating machine, which comprises:

[0008] The thickness of the conformal coating is controlled by making a conformal coating thickness control standard sample and calculating the paint output of the spray gun.

[0009] Further, the conformal coating thickness control method for spraying reciprocating machine comprises the following steps:

[0010] Step 1, making conformal coating thickness control standard sample with thickness X1, X2, …, Xn respectively, X1X2Xn, n represents the number of standard samples. n n ​​

[0011] Step 2, calculate the difference value of the spray gun paint output control knob scale combined with the product required thickness;

[0012] Step 3, roughly adjust the initial paint output of the spray gun;

[0013] Step 4, fine-tune the paint output of the spray gun to meet the requirements of the standard sample with a thickness of X1;

[0014] Step 5, increase the paint output of the spray gun, and the increase value is the difference value calculated in step 2;

[0015] Step 6, use the three-proofing spraying reciprocating machine to spray the conformal coating on the product and solidify;

[0016] Step 7, take down the product and package for inspection.

[0017] Optionally, in step 1, each standard sample is marked with thickness and corresponding spray gun paint output.

[0018] Further, in step 2, the method for calculating the difference value of the spray gun paint output control knob scale combined with the product required thickness is:

[0019] Δδ=δ0–δ1+1;

[0020] Δδ represents the difference value of the spray gun paint output control knob scale;

[0021] δ0 represents the standard sample paint output corresponding knob scale value corresponding to the product required thickness;

[0022] δ1 represents the standard sample paint output corresponding knob scale value corresponding to the thickness X1.

[0023] Optionally, in step 3, the initial paint output of the spray gun is adjusted roughly, and the diameter of the paint outlet is 1mm.

[0024] Optionally, X1=20μm.

[0025] In summary, due to the adoption of the above technical solutions, the beneficial effects of the present application are:

[0026] By using the present application, when using the three-proofing spraying reciprocating machine to make the conformal coating, the process parameters of the product required thickness can be quickly determined, the product conformal coating thickness control can be quickly realized, and the control of the conformal coating thickness of the printed circuit assembly in most application scenarios can be realized at low cost; and a high-precision printed circuit assembly surface conformal coating with good surface quality consistency and thickness uniformity can be processed, which can reduce the workload of technical personnel and improve the production efficiency of the printed circuit assembly conformal coating spraying. The method is stable and reliable, the coating thickness uniformity is not more than ±10%, and can meet the conformal coating three-proofing spraying reciprocating machine spraying thickness control requirements in most application scenarios. BRIEF DESCRIPTION OF DRAWINGS

[0027] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings in the embodiments will be briefly introduced as follows. It should be understood that the following drawings only show some of the embodiments of the present application, and therefore should not be considered as limiting the scope. For those skilled in the art, other related drawings can also be obtained without creative labor on the basis of these drawings.

[0028] Figure 1 The flow chart of the coating thickness control method for the spraying reciprocating machine provided in the embodiments of the present application.

[0029] Figure 2 The schematic diagram of the coating thickness control standard sample in the embodiments of the present application.

[0030] Figure 3 The schematic diagram of the coating thickness adjustment in the embodiments of the present application. DETAILED DESCRIPTION

[0031] In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be described clearly and completely in combination with the drawings in the embodiments of the present application. Obviously, the described embodiments are some of the embodiments of the present application, but not all the embodiments. The components of the embodiments of the present application described and shown in the drawings herein can be arranged and designed in various different configurations.

[0032] Therefore, the detailed description of the embodiments of the present application provided in the drawings below is not intended to limit the scope of the claimed present application, but only represents selected embodiments of the present application. All other embodiments obtained by those skilled in the art on the basis of the embodiments in the present application without creative labor are within the scope of the present application.

[0033] EMBODIMENT

[0034] The present embodiment proposes a coating thickness control method for a spraying reciprocating machine, which comprises:

[0035] The coating thickness is controlled by making the coating thickness control standard sample and comparing and calculating the paint output of the spray gun.

[0036] The specific principle is as follows: the coating thickness control standard sample is made; the paint output of the spray gun is adjusted to the minimum; the paint output of the spray gun is adjusted to the starting value of the standard sample; the paint output of the spray gun is further adjusted in combination with the product coating thickness requirement and the standard sample; finally, the spraying and drying of the coating on the product surface are completed using the set process parameters. Specifically, as shown in the following table, the paint output of the spray gun is adjusted to the starting value of the standard sample, and then the paint output of the spray gun is further adjusted in combination with the product coating thickness requirement and the standard sample. Figure 1As shown, the coating thickness control method for the spraying reciprocating machine comprises the following steps:

[0037] Step 1, make coating thickness control standard samples with thicknesses of 20 μm, 30 μm, 40 μm, …, 100 μm respectively; wherein each standard sample is marked with thickness and corresponding paint output of the spray gun, such as Figure 2 as shown;

[0038] Step 2, calculate the difference value of the paint output control knob scale of the spray gun in combination with the product required thickness:

[0039] Δδ=δ0–δ 20 +1;

[0040] Δδ represents the difference value of the paint output control knob scale of the spray gun;

[0041] δ0 represents the standard sample paint output corresponding knob scale value corresponding to the product required thickness;

[0042] δ 20 represents the standard sample paint output corresponding knob scale value corresponding to the thickness of 20 μm.

[0043] Step 3, coarsely adjust the initial paint output of the spray gun, and the diameter of the paint output port of the spray gun is 1 mm, such as Figure 3 as shown;

[0044] Step 4, finely adjust the paint output of the spray gun to meet the requirements of the standard sample with a thickness of 20 μm;

[0045] Step 5, increase the paint output of the spray gun, and the increase value of the paint output is the difference value Δδ calculated in step 2;

[0046] Step 6, use the three-proof spraying reciprocating machine to spray and cure the conformal coating on the product;

[0047] Step 7, take down the product and package for inspection.

[0048] Thus, by using the present application, when using the three-proof spraying reciprocating machine to make the conformal coating, the process parameters of the product required thickness can be quickly determined, the product conformal coating thickness control can be quickly realized, and the control of the conformal coating thickness of the printed circuit assembly in most application scenarios can be realized at low cost; and the high-precision printed circuit assembly surface conformal coating with good surface quality consistency and thickness uniformity can be processed, which can reduce the workload of technical personnel and improve the production efficiency of the printed circuit assembly conformal coating spraying. The method is stable and reliable in process, the coating thickness uniformity is not more than ±10%, and the three-proof spraying reciprocating machine spraying thickness control requirements of the conformal coating in most application scenarios can be met.

[0049] The above merely provides the preferred embodiments of the present application, and is not used to limit the present application. For those skilled in the art, the present application can have various modifications and changes. Any modifications, equivalent replacements, improvements, etc. made within the principles and technical scope of the present application shall fall into the scope of the present application.

Claims

1. A method for profiled coating thickness control for a spray reciprocator, characterized by The application comprises the following steps: The thickness of the coating is controlled by making a standard sample plate of the coating thickness, and calculating the paint output of the spray gun; The application comprises the following steps: Step 1, making the standard sample of the coating thickness control of the profile coating, the thicknesses are X1, X2, …, Xn respectively, X1 < X2 < … < Xn n , n represents the number of the standard samples; each standard sample is marked with the thickness and the corresponding paint output of the spray gun; n ​ Step 2, calculating the difference of the scale of the paint output control knob according to the required thickness of the product; Step 3, roughly adjusting the initial paint output of the spray gun; Step 4, finely adjusting the paint output of the spray gun to reach the required thickness of the standard sample plate X1; Step 5, increasing the paint output of the spray gun by the difference calculated in Step 2; Step 6, spraying the coating on the product by using a three-proofing spraying reciprocating machine and curing it; Step 7, taking down the product and packaging and inspecting it; In Step 2, the method for calculating the difference of the scale of the paint output control knob according to the required thickness of the product is as follows: Δδ=δ0-δ1+1; Δδ represents the difference of the scale of the paint output control knob; δ0 represents the scale value of the standard sample plate corresponding to the paint output corresponding to the required thickness of the product; δ1 represents the scale value of the standard sample plate corresponding to the paint output corresponding to the thickness X1.

2. A method of conformal coating thickness control for a spray reciprocator according to claim 1, wherein In Step 3, the initial paint output of the spray gun is 1mm in diameter at the paint outlet.

3. A method for profile control of coating thickness for a spray reciprocator according to claim 1, characterized in that, X1=20μm.

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