Shielding coating method capable of preventing spill coating

Abstract

The invention relates to the technical field of coating processes, in particular to an anti-overflow coating shielding method. The method comprises the following steps: determining a corresponding profiling clearance jig based on the straight position thickness of a to-be-coated product; the sealing protection low-viscosity film is removed, the non-film-coating face of the product to be film-coated is pressed into the profiling clearance cavity so that the temperature-resistant high-viscosity film and the non-film-coating face can be attached to each other, and a first assembly is obtained; the temperature-resistant high-viscosity film bonded with the first assembly body is bonded with the film-coated hanging plate, and the bonded film-coated hanging plate revolves around the scattered film-coated pills in a vacuum environment in the film-coated cavity according to a first preset rotating speed until film coating of the first assembly body is completed; and carrying out coating post-treatment on the first assembly body to obtain a coated target product. The glass straight position of the to-be-coated product is protected through the profiling clearance jig, and the problem of overflow coating of the glass straight position is solved, so that the process stability and the yield are improved, and the beneficial effects of improving the process quality and the yield stability are achieved.

Description

Technical Field

[0001] The present application relates to the technical field of coating technology, and in particular to a shielding coating method for preventing overfilling. Background Art

[0002] At present, many glass labels use surface treatment processes such as fingerprint oil coating and AF coating (Anti-Fingerprint Coating) to improve the product's waterproof level and drop performance. However, these processes have a defect that is difficult to overcome, that is, after the glass surface is coated, overflow plating will occur on the vertical position. For example, there will be 1 to 2 vertical edges of the four sides of square glass, or even overflow plating on all the vertical edges; circular glass will have half a circle of vertical edges overflow plating. This overflow plating phenomenon cannot be completely avoided, and it is irregular and unfixed, making it difficult to detect, which has a certain impact on the product appearance and performance.

[0003] In order to solve the problem of over-plating, attempts have been made to remove it by methods such as corona plasma, but this has also brought new problems. The above methods will cause serious damage to the AF coating on the front surface, further reducing the appearance and performance of the product. Therefore, the existing technology has not been able to effectively solve the problem of no over-plating on the vertical part of the glass, limiting the further improvement of product performance.

[0004] Implementing effective glass vertical overflow plating solution technology to achieve process stability and yield improvement is crucial to improving process quality and yield stability. Based on this, it is urgently necessary to develop new and efficient technical solutions to break through the existing technical bottlenecks. Summary of the invention

[0005] In order to overcome the shortcomings of the prior art, the present application provides an anti-overflow shielding coating method, which protects the vertical glass body of the product to be coated by a contoured air-avoiding fixture, solves the problem of overflow plating on the vertical glass body, thereby achieving process stability and yield improvement, and achieving the beneficial effect of improving process quality and yield stability.

[0006] The technical solution adopted by this application to solve its technical problem is: A shielding coating method for preventing overfilling, the method comprising: Determine the corresponding contour-avoiding jig based on the thickness of the straight body of the product to be coated; the contour-avoiding jig includes a contour-avoiding cavity, and the contour-avoiding cavity includes a temperature-resistant high-viscosity film and a sealing and protective low-viscosity film; The sealing and protective low-viscosity film is removed, and the non-coated surface of the product to be coated is pressed into the contoured cavity to fit the temperature-resistant high-viscosity film and the non-coated surface to obtain a first assembly; The heat-resistant high-adhesive film of the first assembly is bonded to the coating hanging plate, and the coated hanging plate after bonding revolves around the scattered coating pills according to a first preset speed in the vacuum environment of the coating chamber until the coating of the first assembly is completed; the angle formed by the scattering angle of the coating pills and the first assembly of the coating hanging plate after bonding is a non-vertical angle; The first assembly is subjected to post-coating treatment to obtain a target product that has been coated.

[0007] Optionally, the step of determining a corresponding contour-avoiding fixture based on the thickness of the straight body of the product to be coated includes: Determine the thickness of the plate according to the straight body thickness and the preset thickness; the preset thickness is 0mm to 0.1mm; According to the outer dimensions of the product to be coated and the preset dimensional parameters, the contour-shaped cavity is made on a plate of corresponding plate thickness to obtain a jig to be processed; the positive tolerance dimension of the contour-shaped cavity is the sum of the outer dimensions and the dimensional parameters; Scrape off the contour-avoiding cavity of the jig to be processed to adjust the chamfer of the jig to be processed to within a preset chamfer range; After the jig to be processed is degreased and cleaned after the burrs are scraped off, the two main surfaces of the jig to be processed are coated to obtain the contoured air-avoiding jig; one of the main surfaces is coated with the temperature-resistant high-viscosity film, and the other main surface is coated with the sealing and protective low-viscosity film.

[0008] Optionally, the contoured air-avoiding fixture is made of epoxy board material.

[0009] Optionally, the viscosity of the heat-resistant high-viscosity film is 8 g / cm2 to 10 g / cm2, the temperature resistance does not exceed 180°C, and the shrinkage rate is less than 0.5%.

[0010] Optionally, the viscosity of the sealing and protecting low-viscosity film is 0.6 g / cm2 to 1.0 g / cm2.

[0011] Optionally, the step of bonding the first assembly with a heat-resistant high-adhesive film and a coated hanging board further comprises: Using a process protection low-viscosity film to coat the coated surface of the first assembly to obtain a second assembly; Before performing the step of bonding the first assembly with a high-temperature-resistant adhesive film and coating the hanging board, the process protection low-adhesion film is removed to restore the second assembly to the first assembly.

[0012] Optionally, before the step of causing the bonded coating hanging plate to revolve around the scattered coating pills at a first preset speed in the vacuum environment of the coating chamber, the step further includes: The bonded coating hanging plate is rotated around the target material in the vacuum environment of the coating chamber according to a second preset rotation speed to sputter silicon dioxide as a base layer on the coating surface of the first assembly.

[0013] Optionally, the non-vertical angle is between 70° and 80°.

[0014] Optionally, the step of performing post-coating treatment on the first assembly to obtain a target product after coating includes: Controlling the coating chamber to deflate so as to adjust the vacuum environment to a normal pressure environment, and allowing the first assembly to stand for a preset time in the normal pressure environment; After the preset time, the epoxy board and the coated product in the first assembly are disassembled in sequence, and the coated product is used as the target product after coating.

[0015] Optionally, the step of taking the coated product as the target product includes: The coated product is sequentially subjected to flat plate cleaning and wipe cleaning, and the coated product that has completed the flat plate cleaning and wipe cleaning is used as the target product that has completed coating.

[0016] The beneficial effects of the present application are as follows: a jig of a specific shape is customized with reference to the thickness of the straight body of the product to be coated, and the inside of the jig contains two layers of film materials: a heat-resistant high-viscosity film and a sealing and protective low-viscosity film. First, remove the sealing and protective low-viscosity film, press the non-coated surface of the product to be coated into the jig, and fit it on the heat-resistant high-viscosity film to form a first assembly. Then, the heat-resistant high-viscosity film on the first assembly is bonded to the coating hanging plate, and the entire assembly is placed in the coating chamber and rotated in a vacuum environment so that the coating pills are scattered at a certain angle and evenly coated on the non-coated surface, thereby completing the coating. Finally, post-coating treatment is performed to finally obtain a target product that has been coated. In summary, this method effectively avoids the overflow of coating at the edge of the straight body by using a jig with a special structure and controlling the scattering angle of the coating pills, thereby improving the process stability and yield stability of the product. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic flow chart of a shielding coating method for preventing overflow plating provided in an embodiment of the present application; Figure 2 It is a schematic diagram of the implementation of the anti-overflow shielding coating method provided in the embodiment of the present application. DETAILED DESCRIPTION

[0018] The present application is further described below in conjunction with the accompanying drawings and embodiments.

[0019] The following will clearly and completely describe the concept, specific structure and technical effects of the present application in combination with the embodiments and drawings, so as to fully understand the purpose, characteristics and effects of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of them. Based on the embodiments of the present application, other embodiments obtained by technicians in this field without creative work are all within the scope of protection of the present application. In addition, all the connection / connection relationships involved in the patent do not simply refer to the direct connection of components, but refer to the formation of a better connection structure by adding or reducing connection accessories according to the specific implementation situation. The various technical features created in this application can be combined interactively without conflicting with each other.

[0020] Reference Figure 1 , Figure 1 : is a schematic flow chart of a shielding coating method for preventing overflow plating provided in an embodiment of the present application, which specifically includes the following steps, which are specifically described below: In step S1, a corresponding contour-based avoidance jig is determined based on the thickness of the product to be coated.

[0021] The contoured air-avoiding fixture is made of epoxy board material, including a contoured air-avoiding cavity, and the contoured air-avoiding cavity includes a temperature-resistant high-viscosity film and a sealing and protective low-viscosity film.

[0022] Specifically, the thickness of the contoured air-avoiding jig is determined according to the thickness of the vertical body of the product to be coated, so that the thickness of the contoured air-avoiding jig is slightly larger than the thickness of the vertical body of the product. If the thickness of the contoured air-avoiding jig is too thicker than the thickness of the vertical body of the product, it may cause the processing accuracy of the coating on the coating surface during the subsequent coating process, affecting the product yield; and if the thickness of the contoured air-avoiding jig is less than the thickness of the vertical body of the product, when the jig with the product is coated in the following steps, because the thickness of the jig is not enough to support the total thickness of the product and the high-viscosity film, it may cause gaps and bubbles to be generated during the coating process. Based on this, the present application proposes to add a preset thickness to the thickness of the vertical body of the product to be coated as the thickness of the plate selected for the contoured air-avoiding jig. In the embodiment of the present application, the plate thickness t=T+0~0.1mm, where T is the thickness of the vertical body of the product to be coated, and 0~0.1mm means that the preset thickness is 0mm to 0.1mm.

[0023] More specifically, the contoured air-avoiding cavity in the contoured air-avoiding fixture is determined according to the glass outer dimensions of the product to be coated, so that the size of the contoured air-avoiding cavity is slightly larger than the outer dimensions of the product to be coated, ensuring that the contoured air-avoiding cavity can fit the glass surface tightly, thereby effectively protecting the vertical position of the glass and avoiding overflow during processing or coating. Based on this, the present application proposes to add preset size parameters based on the outer dimensions of the glass. In the embodiment of the present application, the size of the contoured air-avoiding cavity is m=M+0.05mm, where M is the outer dimensions of the glass, m is the contouring size, and 0.05mm is the preset size parameter.

[0024] More specifically, the contour-profiling and air-avoiding jig needs to be prepared in advance before selection for subsequent use. Therefore, the embodiment of the present application proposes that the step of determining the corresponding contour-profiling and air-avoiding jig based on the thickness of the straight body of the product to be coated includes: The thickness of the plate is determined according to the thickness at the straight position and the preset thickness.

[0025] Wherein, the preset thickness is 0 mm to 0.1 mm.

[0026] Specifically, the plate thickness t is selected according to the straight body thickness T of the product, where t = T + 0~0.1mm, so that the plate thickness is slightly larger than the product thickness to ensure that there is enough material to form the required contoured cavity.

[0027] Furthermore, according to the outer dimensions of the product to be coated and preset dimensional parameters, the contoured cavity is made on a plate of corresponding plate thickness to obtain a jig to be processed.

[0028] Wherein, the positive tolerance dimension of the contoured cavity is the sum of the outer dimension and the dimension parameter.

[0029] Specifically, the dimension m of the cavity should be 0.05 mm larger than the outer dimension M of the glass, which is a positive tolerance (i.e., a positive tolerance dimension) to ensure that the cavity can closely adapt to the shape of the glass while leaving appropriate clearance to prevent an overly tight fit.

[0030] Furthermore, the cutting edge of the contoured cavity in the jig to be processed is scraped off to adjust the chamfer of the jig to be processed to within a preset chamfer range.

[0031] Specifically, the contoured and air-avoiding areas of the jig to be processed obtained in the above steps are scraped clean to ensure a smooth surface without burrs, and the chamfers of the jig to be processed are processed. Specifically, the chamfer of the part in contact with the product does not exceed 0.05mm to avoid overflow plating during electroplating or other surface treatment processes, and the chamfer of the outer periphery of the jig to be processed can be slightly larger, reaching 0.15mm, because these parts do not directly contact the product.

[0032] More specifically, chamfering means cutting the corners of a workpiece to form a specific inclined surface. In drawings, C chamfers are usually represented by the letter "C" and the specific size is marked. For example, "C0.5" means that a 0.5mm chamfer is machined at 45° from the edge, which clearly tells the manufacturer which edges are chamfered and the specific size and shape of the chamfer.

[0033] Furthermore, after the jig to be processed is degreased and cleaned after the burrs are scraped off, two main surfaces of the jig to be processed are coated to obtain the contour-profiling air-avoiding jig.

[0034] Among them, one of the main surfaces adopts the temperature-resistant high-viscosity film, and the other main surface adopts the sealing and protective low-viscosity film.

[0035] Specifically, after the chamfering process is completed, the selected plate is degreased and cleaned to remove any oil or impurities that may affect the quality of the coating. Then, the treated jig is placed in the laminating machine for double-sided lamination, with a high-temperature resistant high-viscosity film (temperature-resistant high-viscosity film) on one side and a low-viscosity process turnover protective film (sealing protection low-viscosity film) on the other side. In the embodiment of the present application, one main surface can be the direction of the coated surface of the product (defined as the front side), and the other main surface can be the direction of the non-coated surface of the product (defined as the back side).

[0036] More specifically, the viscosity of the heat-resistant high-viscosity film provided in the embodiment of the present application is 8g / cm to 10g / cm, which is usually an acrylic adhesive system, not a silicone-containing system. The acrylic adhesive system has excellent high-temperature resistance and good adhesion, while the non-silicone-containing system avoids substances such as silicone oil that may cause pollution to certain products. Among them, viscosity refers to the force value of the pulling edge force divided by the width of the product adhesive (in cm), that is, the pulling force per centimeter of width is 8 to 10 grams. This high viscosity ensures that the protective film can still firmly adhere to the product surface at high temperatures; The temperature resistance of the heat-resistant high-viscosity film does not exceed 180°C, that is, the heat-resistant high-viscosity film can remain stable at a temperature not exceeding 180°C, and will not fail or lose its viscosity due to high temperature, ensuring the protective effect; even after high-temperature baking, the surface of the protective film will not debond, maintaining good adhesion performance; The shrinkage rate of the heat-resistant high-viscosity film is less than 0.5%. Specifically, at room temperature, the length of the protective film is L, and it becomes l after high-temperature baking. Its shrinkage rate (Ll) / L should be less than or equal to 0.5%. This indicator is used to show that the heat-resistant high-viscosity film has good dimensional stability at high temperatures.

[0037] More specifically, the sealing protection low-viscosity film provided in the embodiments of the present application and the process protection low-viscosity film described below have a viscosity of 0.6 g / cm2 to 1.0 g / cm2, so that they can be used as temporary protection during the production process, and no residual glue or dust will be left when the film is torn off after lamination.

[0038] It is worth noting that during the laminating process, the parameters and operation of the laminating machine need to be precisely controlled to ensure that the high-viscosity film fits perfectly with the surface of the fixture to ensure that no bubbles are generated. Lamination should not be performed on a fixture that has already been installed with a product, as this may cause the total thickness of the product to exceed the thickness of the fixture, thereby generating bubbles after lamination.

[0039] Furthermore, after the laminating operation is completed, the jigs are cut off piece by piece from the protective film to obtain a plurality of contour-shaped air-avoiding jigs for subsequent use.

[0040] In step S2, the sealing and protective low-viscosity film is removed, and the non-coated surface of the product to be coated is pressed into the contoured cavity to fit the temperature-resistant high-viscosity film and the non-coated surface to obtain a first assembly.

[0041] Specifically, the sealed protective low-viscosity film used for temporary protection after the contoured air-avoiding jig is made is torn off, so that the heat-resistant high-viscosity film on the other surface of the contoured air-avoiding jig is exposed, and a suction pen or finger cots (finger cots refer to fingers wearing special gloves to avoid direct contact with the product to cause contamination or damage) are used to gently absorb the coated surface of the product or the vertical position of the product is directly taken with fingers, so that the coated surface of the product faces up, and the non-coated surface is fitted with the exposed heat-resistant high-viscosity film, and pressed to discharge the gas in the contoured air-avoiding cavity, thereby obtaining a first assembly consisting of the contoured air-avoiding jig, its heat-resistant high-viscosity film, and the product to be coated.

[0042] Further, in the embodiment of the present application, in order to facilitate batch processing of coating and avoid dust adhering to the coating surface of the product to be coated during the processing, it is proposed that the step of bonding the first assembly with a high-adhesive film and a coating hanging board further includes: The coated surface of the first assembly is coated with a process protection low-viscosity film to obtain a second assembly.

[0043] Specifically, after the product is precisely placed on the jig and fully adhered to the high-viscosity film, in order to further protect the coated surface of the product, a layer of process protection low-viscosity film is covered on the coated surface of the product. The main function is to prevent dust, dirt or other impurities from adhering to the front surface of the product, thereby maintaining the cleanliness and integrity of the product. In addition, the process protection low-viscosity film can also reduce the contact between the coated surface of the product and moisture in the air, thereby preventing the product from changing performance or being damaged due to moisture absorption. Then, a second assembly consisting of the first assembly combined with the process protection low-viscosity film is obtained.

[0044] Furthermore, before performing the step of bonding the first assembly with a temperature-resistant high-viscosity film and coating the hanging board, the process protection low-viscosity film is removed to restore the second assembly to the first assembly.

[0045] Specifically, before placing the obtained second assembly into the coating chamber, the process protection low-viscosity film on the second assembly is torn off so that the coating material can directly act on the coating surface of the product.

[0046] In step S3, the temperature-resistant high-adhesive film of the first assembly is bonded to the coating hanging plate, and the coated hanging plate after bonding revolves around the scattered coating pills at a first preset speed in the vacuum environment of the coating chamber until the coating of the first assembly is completed.

[0047] Wherein, the angle formed by the scattering angle of the coated pills and the first assembly of the coated hanging plate after bonding is a non-vertical angle.

[0048] Specifically, before the coating begins, the air in the coating chamber of the coating machine needs to be evacuated to form a vacuum environment, thereby reducing the impact of impurities and oxygen in the air on the coating process and ensuring the quality and uniformity of the coating layer. Subsequently, a high-viscosity double-sided adhesive is used to bond the heat-resistant high-viscosity film of the first assembly to the coating hanging plate, and the coating hanging plate is rotated at a preset speed [for example, 30 revolutions per minute (R / min)] to allow the coating material to be evenly deposited on the surface of the product to avoid local over-thickness or over-thinness. During this process, the surrounding coating pills are scattered at an angle that is non-perpendicular to the surface of the product (for example, 70 to 80 degrees) to ensure that the coating material can effectively cover the entire surface of the product, while reducing material waste and unnecessary deposition. Continue to execute until the coating pills are evenly plated to the coating surface of the product to be coated to form the required thin film layer.

[0049] Furthermore, before the step of causing the bonded coating hanging plate to revolve around the scattered coating pills at a first preset speed in the vacuum environment of the coating chamber, the method further includes: The bonded coating hanging plate is rotated around the target material in the vacuum environment of the coating chamber according to a second preset rotation speed to sputter silicon dioxide as a base layer on the coating surface of the first assembly.

[0050] Specifically, before the hanging plate revolves around the coating pill, the hanging plate is first revolved around the target material at a second preset speed, and silicon dioxide is plated as a base layer onto the coating surface of the product to be coated by sputtering technology to improve the adhesion, flatness or other properties of the coating layer. The second preset speed can be adjusted according to actual conditions, and can also be the same as the first preset speed.

[0051] In step S4, the first assembly is subjected to post-plating treatment to obtain a target product after the coating is completed.

[0052] Specifically, after the above-mentioned coating step is completed, a coating post-processing step is performed to obtain a final product, wherein the coating post-processing step includes but is not limited to standing, disassembling, cleaning, etc. Specifically, the step of performing coating post-processing on the first assembly to obtain a coating-completed target product includes: The coating chamber is controlled to be deflated to adjust the vacuum environment to a normal pressure environment, and the first assembly is left to stand for a preset time in the normal pressure environment.

[0053] Specifically, after the coating is completed, the vacuum environment in the coating machine needs to be released and adjusted to a normal pressure environment, that is, "deflated", so that the product can be taken out of the vacuum environment and prepared for subsequent processing or testing. In a normal pressure environment, the product is left to stand normally for a preset time, so that the coating layer on the coating surface of the product can stabilize and achieve the best performance and adhesion. Among them, the preset time can be set according to actual conditions.

[0054] Furthermore, after the preset time, the epoxy board and the coated product in the first assembly are disassembled in sequence, and the coated product is used as the target product after coating.

[0055] Specifically, after the static state is completed, the epoxy board is carefully cut and removed using appropriate tools (such as shears, disk saws, etc.), and the epoxy board of the coating machine is first removed to expose the coated product, and then the coated product is disassembled and taken out, so as to avoid damage to the epoxy board or the sensitive parts inside due to lack of support. Then, the taken out coated product is used as the target product for the coating, and specifically, the following steps are also included: The step of using the coated product as the target product comprises: The coated product is sequentially subjected to flat plate cleaning and wipe cleaning, and the coated product that has completed the flat plate cleaning and wipe cleaning is used as the target product that has completed coating.

[0056] Specifically, the surface of the coated product is cleaned using a flat cleaning device or method, such as ultrasonic cleaning, spray cleaning, etc., to effectively remove dust, dirt and other impurities on the surface of the product. Then, after the flat cleaning, a more detailed cleaning, i.e., wipe cleaning, is performed, such as using a soft cloth or a special cleaning tool to manually or mechanically wipe the surface of the product to ensure that any residual stains or fingerprints are completely removed. Finally, the coated product that has completed the above cleaning steps is regarded as the target product that completes the entire process.

[0057] To further explain the shielding coating method for preventing overflow plating provided by the present application, and to deepen understanding, please refer to Figure 2 , Figure 2 The schematic diagram of the implementation of the shielding coating method for preventing overfilling provided in the embodiment of the present application specifically includes the following steps: 1. Make a profiling avoidance jig.

[0058] Specifically, the key design points for making a contoured air-avoiding fixture can refer to the above content and will not be repeated here. The "contoured air-avoiding" shown in the figure is a contoured air-avoiding cavity made on the fixture, which is used to place the product to be coated later.

[0059] 2. Double-sided lamination of contour-shaped air-avoiding jig.

[0060] Specifically, after the contoured air-avoiding cavity is made, a heat-resistant high-viscosity film (shown as "high-temperature-resistant high-viscosity film") is covered on one main surface of the contoured air-avoiding fixture, and a sealing and protective low-viscosity film (shown as "low-viscosity film") is covered on the other main surface. The specific design points can be referred to the above content, and will not be elaborated here.

[0061] 3. Peel off the film from the front of the fixture.

[0062] Specifically, the "front side" refers to the side covered with the "low-viscosity film" shown in the figure, while the "high-temperature resistant high-viscosity film" shown in the figure is retained so that it is exposed to facilitate the subsequent placement of the products to be coated.

[0063] 4. Products are placed inside the fixture.

[0064] Specifically, referring to the above content, the product to be coated is placed in the contoured airtight cavity.

[0065] 5.Lamination on the front of the product.

[0066] Specifically, a layer of low-viscosity film is used as a process turnover protective film, covering the front side of the fixture.

[0067] 6. Apply double-sided tape, tear off the film, and coat it.

[0068] Specifically, one side of the jig covered with the temperature-resistant high-viscosity film is adhered to the coating hanging board by double-sided tape, and the process turnover protective film on the other main surface is torn off to facilitate subsequent coating.

[0069] 7. Coating and subsequent processing.

[0070] For details, please refer to the above content and will not go into details.

[0071] The above is a specific description of the preferred implementation of the present application, but the invention of the present application is not limited to the described embodiments. Technical personnel familiar with the field can also make various equivalent modifications or substitutions without violating the spirit of the present application. These equivalent modifications or substitutions are all included in the scope defined by the claims of the present application.

Claims

1. A shielding coating method for preventing overflow plating, characterized in that: The method comprises: Determine the corresponding contour-avoiding jig based on the thickness of the straight body of the product to be coated; the contour-avoiding jig includes a contour-avoiding cavity, and the contour-avoiding cavity includes a temperature-resistant high-viscosity film and a sealing and protective low-viscosity film; The sealing and protective low-viscosity film is removed, and the non-coated surface of the product to be coated is pressed into the contoured cavity to fit the temperature-resistant high-viscosity film and the non-coated surface to obtain a first assembly; The heat-resistant high-adhesive film of the first assembly is bonded to the coating hanging plate, and the coated hanging plate after bonding revolves around the scattered coating pills according to a first preset speed in the vacuum environment of the coating chamber until the coating of the first assembly is completed; the angle formed by the scattering angle of the coating pills and the first assembly of the coating hanging plate after bonding is a non-vertical angle; The first assembly is subjected to post-coating treatment to obtain a target product that has been coated.

2. The shielding coating method for preventing overflow plating according to claim 1, characterized in that: The step of determining the corresponding contour-avoiding fixture based on the thickness of the straight body of the product to be coated comprises: Determine the thickness of the plate according to the straight body thickness and the preset thickness; the preset thickness is 0mm to 0.1mm; According to the outer dimensions of the product to be coated and the preset dimensional parameters, the contour-shaped cavity is made on a plate of corresponding plate thickness to obtain a jig to be processed; the positive tolerance dimension of the contour-shaped cavity is the sum of the outer dimensions and the dimensional parameters; Scrape off the contour-avoiding cavity of the jig to be processed to adjust the chamfer of the jig to be processed to within a preset chamfer range; After the jig to be processed is degreased and cleaned after the burrs are scraped off, the two main surfaces of the jig to be processed are coated to obtain the contoured air-avoiding jig; one of the main surfaces is coated with the temperature-resistant high-viscosity film, and the other main surface is coated with the sealing and protective low-viscosity film.

3. The shielding coating method for preventing overflow plating according to claim 1, characterized in that: The material of the contour-forming air-avoiding fixture is epoxy board material.

4. The shielding coating method for preventing overflow plating according to claim 1, characterized in that: The viscosity of the heat-resistant high-viscosity film is 8 g / cm2 to 10 g / cm2, the temperature resistance does not exceed 180°C, and the shrinkage rate is less than 0.5%.

5. The shielding coating method for preventing overflow plating according to claim 1, characterized in that: The viscosity of the sealing and protecting low-viscosity film is 0.6 g / cm2 to 1.0 g / cm2.

6. The shielding coating method for preventing overflow plating according to claim 1, characterized in that: The step of bonding the first assembly with a high-temperature resistant adhesive film and a coated hanging board also includes: Using a process protection low-viscosity film to coat the coated surface of the first assembly to obtain a second assembly; Before performing the step of bonding the first assembly with a high-temperature-resistant adhesive film and coating the hanging board, the process protection low-adhesion film is removed to restore the second assembly to the first assembly.

7. The shielding coating method for preventing overflow plating according to claim 1, characterized in that: Before the step of orbiting the coated hanging plate after bonding around the scattered coated pills at a first preset speed in the vacuum environment of the coating chamber, the method further includes: The bonded coating hanging plate is rotated around the target material in the vacuum environment of the coating chamber according to a second preset rotation speed to sputter silicon dioxide as a base layer on the coating surface of the first assembly.

8. The shielding coating method for preventing overflow plating according to claim 1, characterized in that: The non-vertical angle is 70° to 80°.

9. The shielding coating method for preventing overflow plating according to claim 1, characterized in that: The step of performing post-coating treatment on the first assembly to obtain a target product after coating includes: Controlling the coating chamber to deflate so as to adjust the vacuum environment to a normal pressure environment, and allowing the first assembly to stand for a preset time in the normal pressure environment; After the preset time, the epoxy board and the coated product in the first assembly are disassembled in sequence, and the coated product is used as the target product after coating.

10. The shielding coating method for preventing overflow plating according to claim 9, characterized in that: The step of using the coated product as the target product comprises: The coated product is sequentially subjected to flat plate cleaning and wipe cleaning, and the coated product that has completed the flat plate cleaning and wipe cleaning is used as the target product that has completed coating.

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